<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0870-9025</journal-id>
<journal-title><![CDATA[Revista Portuguesa de Saúde Pública]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Port. Sau. Pub.]]></abbrev-journal-title>
<issn>0870-9025</issn>
<publisher>
<publisher-name><![CDATA[Escola Nacional de Saúde Pública]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0870-90252012000100010</article-id>
<article-id pub-id-type="doi">10.1016/j.rpsp.2011.12.002</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Exposição ocupacional a citostáticos e efeitos sobre a saúde]]></article-title>
<article-title xml:lang="en"><![CDATA[Occupational exposure to anticancer drugs and adverse health effects]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suspiro]]></surname>
<given-names><![CDATA[Alexandra]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Prista]]></surname>
<given-names><![CDATA[João]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidade Nova de Lisboa Escola Nacional de Saúde Pública Departamento de Saúde Ocupacional e Ambiental]]></institution>
<addr-line><![CDATA[Lisboa ]]></addr-line>
<country>Portugal</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2012</year>
</pub-date>
<volume>30</volume>
<numero>1</numero>
<fpage>76</fpage>
<lpage>88</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0870-90252012000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0870-90252012000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0870-90252012000100010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Os citostáticos são genotóxicos e não completamente seletivos para as células neoplásicas, podendo afetar o genoma das células normais. Está comprovada a sua genotoxicidade em modelos experimentais e doentes tratados com quimioterapia. Os profissionais de saúde responsáveis pela sua preparação e administração apresentam risco de sofrer efeitos adversos para a saúde, tendo sido comprovado por diversos estudos haver contaminação generalizada do ambiente e de superfícies de trabalho. Os procedimentos de segurança e equipamentos de proteção individual têm sido insuficientes para evitar a absorção, evidenciada por quantidades mensuráveis de citostáticos na urina, e o aumento de indicadores biológicos de genotoxicidade. São revistos os efeitos para a saúde decorrentes desta exposição.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Anticancer drugs share DNA-damaging properties affecting not only target-cells, but also non tumour cells. Its genotoxicity has been demonstrated in experimental models and in cancer patients treated with chemotherapy. Health care personnel involved in the preparation and administration of these agents are at risk for adverse health effects, since environmental sampling studies demonstrated widespread contamination of work surfaces and utensils. Adherence to safety guidelines and proper use of personal protective equipment are insufficient to prevent significant absorption, evidenced by the presence of detectable amounts of drugs in urine samples and increased frequency of genotoxicity biomarkers. The evidence regarding adverse health effects on workers occupationally exposed to anticancer agents is reviewed.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Citostáticos]]></kwd>
<kwd lng="pt"><![CDATA[Exposição ocupacional]]></kwd>
<kwd lng="pt"><![CDATA[Efeitos para a saúde]]></kwd>
<kwd lng="en"><![CDATA[Anticancer drugs]]></kwd>
<kwd lng="en"><![CDATA[Occupational exposure]]></kwd>
<kwd lng="en"><![CDATA[Health effects]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <P><B>Exposição ocupacional a citostáticos e efeitos sobre a saúde</B></P>     <p>&nbsp;</p>     <P><B>Alexandra Suspiro<SUP>a</SUP>, João Prista<SUP>a</SUP></b></p>     <P><SUP>a</SUP>Departamento de Saúde Ocupacional e Ambiental, Escola Nacional de  Saúde Pública Universidade Nova de Lisboa, Universidade Nova de Lisboa, Lisboa,  Portugal. <A href="mailto:a.suspiro@ensp.unl.pt">a.suspiro@ensp.unl.pt</A></P>      <p>&nbsp;</p>     <P><B>Resumo</B></P>    <P> Os citostáticos são genotóxicos e não completamente seletivos para as células  neoplásicas, podendo afetar o genoma das células normais. Está comprovada a sua  genotoxicidade em modelos experimentais e doentes tratados com quimioterapia. Os  profissionais de saúde responsáveis pela sua preparação e administração  apresentam risco de sofrer efeitos adversos para a saúde, tendo sido comprovado  por diversos estudos haver contaminação generalizada do ambiente e de  superfícies de trabalho. Os procedimentos de segurança e equipamentos de  proteção individual têm sido insuficientes para evitar a absorção, evidenciada  por quantidades mensuráveis de citostáticos na urina, e o aumento de indicadores  biológicos de genotoxicidade. São revistos os efeitos para a saúde decorrentes  desta exposição.</P>     <P><B>Palavras Chave:</B> Citostáticos. Exposição ocupacional. Efeitos para a saúde.</P>     <p>&nbsp;</p>     <P><B>Occupational exposure to anticancer drugs and adverse health effects</B></P>     ]]></body>
<body><![CDATA[<P><B>Abstract</B></P>    <P>Anticancer drugs share DNA–damaging properties affecting not only  target–cells, but also non tumour cells. Its genotoxicity has been demonstrated  in experimental models and in cancer patients treated with chemotherapy. Health  care personnel involved in the preparation and administration of these agents  are at risk for adverse health effects, since environmental sampling studies  demonstrated widespread contamination of work surfaces and utensils. Adherence  to safety guidelines and proper use of personal protective equipment are  insufficient to prevent significant absorption, evidenced by the presence of  detectable amounts of drugs in urine samples and increased frequency of  genotoxicity biomarkers. The evidence regarding adverse health effects on  workers occupationally exposed to anticancer agents is reviewed.</P>     <P><B>Keywords:</B> Anticancer drugs. Occupational exposure. Health effects.</P>     <p>&nbsp;</p>     <P>Os fármacos antineoplásicos são cada vez mais utilizados quer na terapêutica  de doenças malignas quer com intuitos profiláticos (terapêutica adjuvante) e num  espetro crescente de patologia benigna (doenças autoimunes, doenças  inflamatórias crónicas do foro gastroenterológico ou reumatológico, entre  outras). Têm em comum o facto de poderem lesar o genoma celular (efeito  genotóxico). Idealmente, deveriam afetar apenas as células neoplásicas; os  fármacos disponíveis, no entanto, embora afetem preferencialmente as células  malignas, são relativamente inespecíficos, afetando simultaneamente o genoma das  células normais e condicionando assim efeitos adversos para a saúde quer dos  doentes tratados quer dos profissionais de saúde a eles expostos.</P>     <P>A genotoxicidade dos citostáticos tem sido evidenciada por estudos <I>in  vitro</I> em diversos tipos de células. Yamada (2000)<SUP>1</SUP>, por exemplo,  demonstrou a existência de aberrações cromossómicas e de mutações induzidas pela  exposição a 5 citostáticos numa linha celular linfoide. Boos<SUP>2</SUP> estudou  os efeitos dos inibidores da topoisomerase ii sobre células linfoides de ratinho  e verificou que estes induziram um aumento da frequência de micronúcleos e do  grau de lesão do ADN medido pelo <I>comet assay</I>. Aydemir<SUP>3</SUP> avaliou  os efeitos genotóxicos da gemcitabina <I>in vitro</I> sobre linfócitos humanos  utilizando o teste de aberrações cromossómicas e o teste de troca de cromátides  irmãs (<I>Sister Chromatid Exchange</I> - SCE), tendo verificado que induz um  aumento significativo de ambos em todas as concentrações testadas. Num estudo  mais recente, demonstrou-se que o etoposido partilha com o metabolito do benzeno  hidroquinona a capacidade de originar endorreduplicação cromossómica  (amplificação do ADN sem a divisão celular correspondente), mecanismo que pode  levar a hiperploidia<SUP>4</SUP>.</P>     <P>A genotoxicidade dos citostáticos tem sido também demonstrada <I>in vivo</I>  em modelos de ratinho, nomeadamente sobre as células hematopoiéticas da medula  óssea (aumento da frequência de aberrações cromossómicas e de  micronúcleos)<SUP>5</SUP><SUP>, </SUP><SUP>6</SUP> e sobre as células  espermáticas (aneuploidia e aberrações cromossómicas estruturais, detetadas por  hibridização <I>in situ</I>)<SUP>7</SUP>.</P>     <P>Existem ainda estudos evidenciando a genotoxicidade dos citostáticos em  doentes com cancro tratados com estes agentes, traduzida num aumento da  frequência de micronúcleos<SUP>8</SUP><SUP>, </SUP><SUP>9</SUP><SUP>,  </SUP><SUP>10</SUP><SUP>, </SUP><SUP>11</SUP> e no aumento do grau de lesão do  ADN medido pelo <I>comet assay</I><SUP>12</SUP>.</P>     <P>Em profissionais expostos a citostáticos, várias publicações referem uma  frequência aumentada de diversos indicadores biológicos de genotoxicidade como  sejam aberrações cromossómicas<SUP>13</SUP><SUP>, </SUP><SUP>14</SUP><SUP>,  </SUP><SUP>15</SUP><SUP>, </SUP><SUP>16</SUP><SUP>, </SUP><SUP>17</SUP><SUP>,  </SUP><SUP>18</SUP>, troca de cromátides irmãs<SUP>15</SUP><SUP>,  </SUP><SUP>17</SUP><SUP>, </SUP><SUP>19</SUP><SUP>, </SUP><SUP>20</SUP><SUP>,  </SUP><SUP>21</SUP>, micronúcleos<SUP>19</SUP><SUP>, </SUP><SUP>22</SUP><SUP>,  </SUP><SUP>23</SUP>, lesão do ADN detetada por <I>comet  assay</I><SUP>24</SUP><SUP>, </SUP><SUP>25</SUP><SUP>, </SUP><SUP>26</SUP><SUP>,  </SUP><SUP>27</SUP><SUP>, </SUP><SUP>28</SUP> e mutações<SUP>29</SUP><SUP>,  </SUP><SUP>30</SUP>, geralmente avaliadas em linfócitos do sangue  periférico.</P>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<P><B>Exposição ocupacional a citostáticos</B></P>     <P>Para além dos doentes com cancro, expostos a efeitos genotóxicos sobre as  células normais por inerência da terapêutica da sua patologia, determinados  grupos profissionais estão expostos, pelas exigências da sua atividade de  trabalho, a estes fármacos. Destacam-se os profissionais de enfermagem,  responsáveis pela administração da terapêutica citostática, e os profissionais  das farmácias hospitalares, responsáveis pela sua preparação.</P>     <P>A exposição profissional parece ocorrer preferencialmente por via cutânea,  resultante da manipulação direta dos fármacos ou contacto com superfícies e  equipamentos contaminados<SUP>31</SUP><SUP>, </SUP><SUP>32</SUP>. Diversos  estudos confirmam que existe contaminação generalizada das superfícies de  trabalho, paredes, pavimentos, roupas de vestir e de cama de doentes tratados e  recipientes que contêm ou contiveram secreções e excreções destes em todas as  situações de trabalho, quer ao nível da preparação pelos técnicos de farmácia  quer ao nível da administração pelos profissionais de enfermagem (Quadro 1). Os  doentes tratados eliminam quantidades importantes de citostáticos através das  secreções e excreções após a terapêutica e constituem assim uma possível fonte  adicional de contaminação<SUP>31</SUP>. Fransman<SUP>32</SUP>, por exemplo,  demonstrou existirem quantidades significativas de citostáticos nas roupas de  cama de doentes tratados, justificando a recomendação de que estas sejam  transportadas em separado e sujeitas a pré-lavagem antes de serem misturadas com  as restantes roupas<SUP>33</SUP>.</P>     <p>&nbsp;</p>     <p><b><a href="/img/revistas/rpsp/v30n1/30n1a10q1.jpg" target="_blank">Quadro 1</a></b> <b>Estudos da contaminação do ar ambiente e de  superfícies/equipamentos de trabalho</b></p>     
<p>&nbsp;</p>     <P>Apesar da utilização, atualmente quase generalizada, de câmaras de fluxo  laminar vertical, demonstrou-se que existe contaminação das superfícies  exteriores da câmara e de zonas relativamente distantes, resultante quer da  dispersão aérea do agente quer de transferência por mãos e objetos  contaminados<SUP>34</SUP>. Foi detetada contaminação de paredes, pavimentos,  bancadas e dos mais diversos equipamentos e objetos de trabalho.  Cavallo<SUP>35</SUP>, por exemplo, detetou contaminação no exterior das bombas  infusoras, nos braços das cadeiras usadas para administrar os citostáticos e nas  tampas dos contentores de resíduos. Brouwers et al.<SUP>36</SUP>, num estudo  conduzido em 7 farmácias hospitalares holandesas, detetaram contaminação em 94%  das amostras provenientes de diversas superfícies, nomeadamente no exterior das  câmaras de fluxo laminar, pavimentos, trincos das portas, manípulos dos sistemas  de transferência de citostáticos e prateleiras das zonas de armazenamento.</P>     <P>A introdução das atuais ampolas seladas representou uma melhoria substancial  em relação ao uso das antigas, que tinham de ser quebradas para extração do  conteúdo. No entanto, a superfície externa destas ampolas está frequentemente  contaminada, contribuindo para a exposição cutânea a estes  agentes<SUP>37</SUP><SUP>, </SUP><SUP>38</SUP>. Touzin<SUP>38</SUP>, por  exemplo, detetou contaminação externa com ciclofosfamida em 13 de 20 ampolas  analisadas. Algumas soluções de citostáticos podem permear as seringas, passando  diretamente para as mãos do trabalhador<SUP>39</SUP>. Foi detetada ainda  contaminação da superfície exterior das embalagens contendo citostáticos, antes  da abertura, sugerindo que é necessária a proteção mesmo durante o  desembalamento<SUP>39</SUP>.</P>     <P>A maior parte dos estudos descrevem níveis mais elevados de contaminação nas  zonas de preparação em relação às de administração<SUP>40</SUP><SUP>,  </SUP><SUP>41</SUP>, mas a frequência de amostras positivas é frequentemente  semelhante<SUP>41</SUP>. Nas zonas de administração, alguns estudos sugerem  diferenças entre o ambulatório (hospital de dia) e o internamento (enfermaria),  associando-se este último a maiores níveis de contaminação<SUP>42</SUP>.</P>     <P>Por outro lado, existem dados que indiciam que diversas das medidas de  prevenção utilizadas têm eficácia limitada. A eficiência das câmaras de fluxo  laminar vertical tem sido contestada, particularmente para a ciclofosfamida, que  pode vaporizar à temperatura ambiente, originando partículas inferiores aos  poros dos filtros <I>HEPA (High Efficency Particulate Air)</I><SUP>31</SUP>. De  modo mais significativo ainda, todas as luvas têm revelado em trabalhos  experimentais serem permeáveis aos citostáticos. Nos anos 80,  Connor<SUP>43</SUP> estudou a permeabilidade de luvas de látex e de PVC à  carmustina e verificou que todas apresentavam permeação aos 90 minutos,  sugerindo que a proteção oferecida é insuficiente. Os mesmos resultados  obtiveram Laidlaw<SUP>44</SUP>, que estudou a permeabilidade de luvas de látex e  PVC a 20 agentes citostáticos, tendo demonstrado haver permeação a todos eles,  com uma intensidade dependente da espessura das luvas. Colligan<SUP>45</SUP>  estudou, também em condições experimentais, a permeabilidade dos mesmos 2 tipos  de luvas à ciclofosfamida e verificou que os primeiros sinais de permeação  ocorreram aos 10 minutos no caso das luvas de látex e aos 20 minutos no caso das  luvas de PVC. Num estudo mais recente, foi testada a permeabilidade de 13 tipos  diferentes de luvas (incluindo látex, PVC, nitrilo e neopreno) a diversos  citostáticos, tendo sido demonstrado que, após uma hora, todos os materiais  apresentavam permeação, baixa mas significativa, a pelo menos um dos  citostáticos testados<SUP>46</SUP>. Esta permeabilidade das luvas aos  citostáticos é evidenciada também pelos estudos em trabalhadores de saúde que  demonstraram existirem níveis significativos de citostáticos na superfície  interior das luvas, em contacto direto com a pele<SUP>25</SUP><SUP>,  </SUP><SUP>32</SUP><SUP>, </SUP><SUP>47</SUP><SUP>, </SUP><SUP>48</SUP><SUP>,  </SUP><SUP>49</SUP><SUP>, </SUP><SUP>50</SUP>. Também o interior das máscaras e  batas utilizadas pode apresentar níveis detetáveis destes agentes, contribuindo  para a exposição cutânea dos trabalhadores<SUP>25</SUP><SUP>,  </SUP><SUP>48</SUP><SUP>, </SUP><SUP>49</SUP>.</P>     ]]></body>
<body><![CDATA[<P>Os produtos de limpeza utilizados nem sempre são eficazes na neutralização de  citostáticos de uso comum, como sejam a ciclofosfamida e o  5-fluoruracilo<SUP>51</SUP>.</P>     <P>A atestar que esta contaminação generalizada das superfícies e equipamentos  de trabalho resulta em contaminação cutânea dos profissionais expostos, estão os  diversos estudos em que foi demonstrada a presença de citostáticos em diversas  regiões corporais, sobretudo ao nível das mãos<SUP>28</SUP><SUP>,  </SUP><SUP>32</SUP><SUP>, </SUP><SUP>49</SUP>. Estes achados demonstram que,  efetivamente, os procedimentos de segurança e os equipamentos de proteção  individual são insuficientes para prevenir a exposição cutânea, com consequente  risco de absorção por esta via.</P>     <P>Apesar de parecer, pelos dados disponíveis, de menor importância, a via  inalatória poderá desempenhar um papel adicional nalguns casos. Alguns  citostáticos, como a ciclofosfamida, podem vaporizar à temperatura  ambiente<SUP>31</SUP>. Determinados tipos de manipulação (transferência de  formulações líquidas com seringa sob pressão, utilização de preparados sólidos  sob a forma de pó ou esmagamento de comprimidos) podem gerar a formação de  aerossóis ou poeiras suscetíveis de serem inalados<SUP>31</SUP>. Nalguns estudos  efetuados com bombas de amostragem individual, foi detetada a presença de  citostáticos no ar ambiente, embora este achado não seja tão frequente nem tão  generalizado como a contaminação de superfícies<SUP>48</SUP><SUP>,  </SUP><SUP>49</SUP><SUP>, </SUP><SUP>52</SUP>.</P>     <P>Para além da exposição crónica a baixas doses, a exposição acidental a  elevadas quantidades de citostáticos pode constituir uma fonte não  negligenciável de dose interna. Assim, um estudo recente de Kopjar<SUP>17</SUP>  revelou que uma percentagem significativa dos trabalhadores referia episódios de  exposição aguda relacionada com quebra/rotura de ampolas e sacos de citostáticos  (43%), derrame do seu conteúdo (39%) ou picadas com cortantes contaminados  (13%).</P>     <P>Esta exposição, predominantemente a nível cutâneo e de forma secundária por  via inalatória, associa-se a absorção significativa destes agentes. Tal é  evidenciado por diversos estudos utilizando biomarcadores de exposição e que  demonstram consistentemente a presença de citostáticos ou dos seus metabolitos  na urina<SUP>25</SUP><SUP>, </SUP><SUP>28</SUP><SUP>, </SUP><SUP>35</SUP><SUP>,  </SUP><SUP>41</SUP><SUP>, </SUP><SUP>47</SUP><SUP>, </SUP><SUP>49</SUP><SUP>,  </SUP><SUP>52</SUP><SUP>, </SUP><SUP>53</SUP><SUP>, </SUP><SUP>54</SUP><SUP>,  </SUP><SUP>55</SUP><SUP>, </SUP><SUP>56</SUP><SUP>, </SUP><SUP>57</SUP><SUP>,  </SUP><SUP>58</SUP><SUP>, </SUP><SUP>59</SUP><SUP>, </SUP><SUP>60</SUP>. Havendo  absorção e dose interna, haverá potencialmente risco de efeitos adversos para a  saúde.</P>     <p>&nbsp;</p>     <P><B>Efeitos adversos para a saúde</B></P>     <P>Os doentes tratados com citotóxicos desenvolvem frequentemente efeitos  tóxicos agudos (mucosite, alopécia, diarreia, citopénias); a exposição  ocupacional, no entanto, não tem sido associada a este tipo de efeitos, exceto  no contexto de acidentes envolvendo quantidades elevadas de  fármaco<SUP>31</SUP>.</P>     <P>Alguns estudos parecem indiciar que, em condições particulares, alguns  profissionais expostos poderão apresentar uma prevalência aumentada de alguns  sintomas atribuíveis a toxicidade aguda dos citostáticos. No início dos anos 90,  um estudo realizado nos EUA<SUP>61</SUP> refere, num grupo de enfermeiras  expostas a citostáticos, uma prevalência superior de diversos sintomas  (gastrointestinais, neurológicos, alérgicos, sistémicos) relacionada com uma  possível toxicidade aguda dos citostáticos, estando o número de sintomas  associado à intensidade de exposição cutânea (avaliada pelo número de doses  manipulada e pela utilização ou não de luvas durante a manipulação). Mais  recentemente, um estudo realizado por Krstev<SUP>62</SUP> na Sérvia analisou 186  enfermeiras expostas a fármacos antineoplásicos por comparação com um grupo  controlo de 77 enfermeiras não expostas. Foi constatada, no grupo exposto, uma  frequência significativamente maior de sintomas como alopécia (OR = 7,14),  <I>rash</I> cutâneo (OR = 4,7) e sensação de lipotímia (OR = 4,78), com uma  regressão significativa nos fins de semana (OR = 4,78). Num estudo semelhante  oriundo da Polónia, Walusiak<SUP>63</SUP> refere, em 104 profissionais expostos  e 103 controlos não expostos, uma prevalência aumentada de alopécia no grupo  exposto (50,6% <I>versus</I> 10,7%).</P>     <P>Na interpretação destes resultados, deve ter-se em consideração que estes 3  estudos podem traduzir realidades particulares não generalizáveis à maior parte  dos ambientes de trabalho atuais. Por exemplo, o estudo de Valanis<SUP>61</SUP>  incluíu profissionais expostas nos anos 70 e início dos anos 80, antes da  implementação generalizada das medidas preventivas atualmente em vigor na maior  parte dos locais de trabalho dos EUA, que ocorreu em meados dos anos 80. Os  profissionais incluídos no estudo sérvio de Krstev<SUP>62</SUP>, por seu lado,  não estavam em grande parte abrangidos por estas medidas, referindo os autores  que apenas 38% utilizava câmaras de fluxo laminar para a preparação dos  citostáticos, 57% máscaras (embora 82% referissem usar luvas) e que na maior  parte dos locais de trabalho não existiam procedimentos escritos nem contentores  específicos para material contaminado. O estudo polaco de Walusiak<SUP>63</SUP>  não refere dados suficientes para se aferirem as condições da atividade de  trabalho. Numa meta-análise recente<SUP>64</SUP>, em que foram analisados todos  os estudos publicados até 2004, foi considerado não existirem dados suficientes  para calcular o risco de efeitos agudos em profissionais expostos a  citostáticos.</P>     ]]></body>
<body><![CDATA[<P>Tendo em conta a genotoxicidade comum a todos os fármacos antineoplásicos, os  efeitos a longo prazo que maior investigação têm merecido prendem-se com o  aumento da incidência de determinados tipos de cancro e com os possíveis efeitos  sobre a reprodução e o desenvolvimento.</P>     <p>&nbsp;</p>     <P><B>Carcinogenicidade</B></P>     <P>De acordo com a IARC <I>(International Agency for Research on Cancer)</I>, 7  fármacos citotóxicos possuem evidência suficiente para serem considerados  carcinogénicos para o Homem (Quadro 2), com base no risco de cancro de doentes  tratados. Esta evidência inclui as associações entre terapêutica com agentes  alquilantes ou inibidores da topoisomerase II e leucemia mieloide aguda e entre  terapêutica com ciclofosfamida e neoplasia da bexiga. Com base nestas  associações, Sessink<SUP>54</SUP> publicou nos anos 90, um trabalho extremamente  interessante visando calcular o risco teórico de cancro em profissionais  expostos a ciclofosfamida, o agente antineoplásico sobre o qual existem mais  dados disponíveis na literatura. Teve em conta os dados de modelos animais, o  risco de tumores secundários em doentes tratados com ciclofosfamida e os valores  disponíveis de marcadores biológicos de exposição (ciclofosfamida urinária) em  profissionais de saúde expostos. Por extrapolação, estimou um risco aumentado,  semelhante para a leucemia e para o carcinoma da bexiga, de 1,4 a 10  casos/milhão/ano.</P>     <p>&nbsp;</p>     <p><b><a href="/img/revistas/rpsp/v30n1/30n1a10q2.jpg" target="_blank">Quadro 2</a></b> <b>Fármacos antineoplásicos classificados pela IARC  quanto à sua carcinogenicidade (vols 1-100, revisto agosto/2010)</b></p>     
<p>&nbsp;</p>     <P><I>Leucemia mieloide</I></P>     <P>Diversos agentes alquilantes isolados (bussulfan, melfalan, clorambucil,  treossulfan) ou em associação como o MOPP (Mostarda nitrogenada + Oncovina +  Procarbazina + Prednisona) e outros esquemas similares, bem como o inibidor da  topoisomerase II etoposido, estão classificados pela IARC no grupo I pela sua  associação com leucemia mieloide aguda. O aumento da incidência de síndrome  mielodisplásica (SMD) e de leucemia mieloide aguda (LMA) após terapêutica  antineoplásica está descrito desde os anos 70<SUP>65</SUP> e foi confirmada por  estudos posteriores<SUP>66</SUP><SUP>, </SUP><SUP>67</SUP>. As síndromes  mielodisplásicas e leucémias pós-terapêutica representam 10-15% do total de  casos e estão descritas após terapêutica com agentes alquilantes e com  inibidores da topoisomerase II<SUP>68</SUP>. Esta terapêutica associa-se a um  risco de SMD e LMA 100 vezes superior ao da população geral<SUP>68</SUP>.  Globalmente, a LMA pós-terapêutica responde pior ao tratamento do que a LMA  <I>de novo</I> e apresenta pior prognóstico. Em termos clínicos e citogenéticos,  estão descritos 2 tipos de LMA pós-terapêutica<SUP>68</SUP><SUP>,  </SUP><SUP>69</SUP>: a) a LMA associada aos alquilantes, caracterizada por um  período de latência médio de 5-7 anos, por ter um SMD antecedente e por  apresentar deleção completa ou parcial do cromossoma 5 e/ou do cromossoma 7 e  cujo risco está relacionado com a dose cumulativa de terapêutica alquilante; b)  a LMA associada aos inibidores da topoisomerase II, caracterizada por um período  de latência médio de 2 anos, por ausência de um SMD antecedente e por apresentar  translocações equilibradas do braço longo do cromossoma 11 envolvendo o gene MLL  <I>(Mixed Lineage Leukemia)</I>, localizado em 11q23, cujo risco é independente  da dose cumulativa de terapêutica.</P>     <P>No que diz respeito a um possível aumento da incidência destas síndromas  hematológicas em profissionais de saúde expostos a citostáticos, existem alguns  dados publicados que são sugestivos duma associação, embora se esteja longe de  uma relação comprovada. Nos anos 90, Skov<SUP>70</SUP> publicou um trabalho em  que foram estudadas enfermeiras de unidades de oncologia (275) <I>versus</I>  outras enfermeiras (765), tendo sido detetado um aumento significativo do risco  de leucemia mieloide nas primeiras (RR = 10,65), embora apenas à custa de 2  casos (1 LMA e 1 LMC). Estudos posteriores mais alargados, de base populacional,  descrevem um aumento da mortalidade por leucemia mieloide em profissionais de  saúde<SUP>71</SUP><SUP>, </SUP><SUP>72</SUP><SUP>, </SUP><SUP>73</SUP><SUP>,  </SUP><SUP>74</SUP>, mas em nenhum deles foi avaliada especificamente a  exposição a citostáticos. A exposição dos profissionais de saúde a outros  agentes possivelmente leucemogénicos (radiações ionizantes, formaldeído, gases  anestésicos, óxido de etileno) torna impossível estabelecer relações etiológicas  com base nestes estudos. De acordo com estas limitações dos dados publicados,  Dranitsaris<SUP>64</SUP> considera na sua meta-análise que não existem dados  suficientes para calcular um risco de cancro de causa ocupacional em  trabalhadores expostos a citostáticos.</P>     ]]></body>
<body><![CDATA[<P><I>Neoplasia da bexiga</I></P>     <P>Outra associação bem estabelecida é a da terapêutica com ciclofosfamida e  risco de neoplasia da bexiga. A ciclofosfamida é um agente alquilante com  elevada toxicidade para o epitélio vesical, originando quer efeitos agudos  (cistite hemorrágica) quer aumento a longo prazo do risco de neoplasia da  bexiga. A prevalência de neoplasia da bexiga em doentes tratados com  ciclofosfamida atinge os 10% aos 11-16 anos e a maior parte dos tumores são  carcinomas de células de transição, embora estejam descritos tipos histológicos  mais raros<SUP>75</SUP>. Não existe, no entanto, do nosso conhecimento, nenhuma  publicação com incidência aumentada desta neoplasia em profissionais expostos a  citostáticos.</P>     <P><I>Outras neoplasias</I></P>     <P>Foi sugerido também aumento do risco de outros tipos de cancro para além dos  referidos, que seriam à partida os expectáveis com base nos efeitos descritos em  doentes tratados com citostáticos. No final dos anos 90, um estudo de  caso-controlo<SUP>76</SUP>, embora de pequenas dimensões (59 casos e 118  controlos), sugere um aumento do risco de cancro da mama em enfermeiras de  oncologia (OR = 1,65). Mais recentemente, Ratner et al.<SUP>77</SUP> et al.  descrevem, num estudo de coorte de maior dimensão (56.213 enfermeiras), um  aumento da incidência de neoplasia da mama (RR = 1,83 para IC = 95%) e, no  subgrupo das profissionais com maior exposição, de cancro do reto (RR = 1,87  para IC = 95%).</P>     <p>&nbsp;</p>     <P><B>Efeitos sobre a reprodução e desenvolvimento</B></P>     <P>Os agentes antineoplásicos são simultaneamente citotóxicos e genotóxicos para  as células germinais. Os possíveis efeitos incidem, por um lado, sobre a  capacidade reprodutiva (redução da fertilidade ou mesmo esterilidade,  transitórias ou definitivas, aumento do risco de anomalias genéticas da linha  germinal, com possível impacto a longo prazo sobre a descendência) e, por outro,  sobre o desenvolvimento, imediato ou a longo prazo, de fetos ou embriões  diretamente expostos.</P>     <P><I>Efeitos sobre a capacidade reprodutiva</I></P>     <P>A toxicidade dos citostáticos para as células germinais, tanto masculinas  como femininas, é confirmada por diversos modelos animais<SUP>7</SUP><SUP>,  </SUP><SUP>78</SUP><SUP>, </SUP><SUP>79</SUP><SUP>, </SUP><SUP>80</SUP>.  Relativamente às células germinais masculinas, os agentes alquilantes são  mutagénicos para todos os estádios de maturação, embora não pareçam ocasionar  aneuploidia ou translocações cromossómicas transmissíveis<SUP>78</SUP>. Os  derivados da platina podem induzir aberrações cromossómicas, também transitórias  e sem repercussão sobre a descendência<SUP>80</SUP>. Os alcaloides da vinca  interferem com o fuso mitótico e originam elevadas taxas de aneuploidia, que ao  nível da linha germinal masculina se parecem traduzir em citotoxicidade para os  espermatócitos primários<SUP>80</SUP>. Os inibidores da topoisomerase ii são  potentes indutores de anomalias cromossómicas, tendo sido demonstrado, num  modelo de ratinho<SUP>7</SUP>, que o etoposido não só induz aberrações  cromossómicas nas células germinais masculinas, como estas células podem  transmitir as lesões à descendência, resultando num esperma com níveis  persistentemente elevados de anomalias cromossómicas, tanto numéricas como  estruturais, muitos anos após ter cessado a exposição ao agente. Também  Palo<SUP>81</SUP> demonstrou, para o antimetabolito citosina-arabinosido, a  indução de aberrações cromossómicas das células germinais masculinas, algumas  das quais transmitidas às células maduras. Relativamente às células germinais  femininas, os agentes alquilantes têm sido associados, em modelos animais, a  aborto espontâneo<SUP>80</SUP>, enquanto que os derivados da platina podem  induzir mutações letais, conduzindo a morte embrionária precoce<SUP>80</SUP>. A  exposição de células germinais femininas a alcaloides da vinca tem sido  associada, também em modelos animais, a malformações fetais resultantes da  fecundação de óvulos aneuploides<SUP>80</SUP>.</P>     <P>Efeitos adversos sobre a reprodução estão bem descritos em doentes tratados.  No homem estão descritas esterilidade (geralmente transitória) e anomalias  genéticas dos espermatozoides, embora tal não pareça traduzir-se em efeitos  adversos sobre as futuras gravidezes<SUP>82</SUP>. Os agentes alquilantes, em  particular, são extremamente citotóxicos para as células germinais masculinas,  causando depleção ou aplasia do epitélio germinal dos testículos com a  consequente oligospermia ou azoospermia, que apresentam baixa taxa de  recuperação a longo prazo<SUP>80</SUP>. Na mulher, a terapêutica com  citostáticos associa-se, com alguma frequência (dependendo do esquema  terapêutico e da idade e função ovárica da mulher) a insuficiência ovárica e  menopausa prematura<SUP>82</SUP>. Os alquilantes são também aqui particularmente  tóxicos, provocando fibrose ovárica com depleção de folículos e oocitos,  acompanhados de taxa elevada de infertilidade<SUP>80</SUP>. Muitas mulheres, no  entanto, recuperam a fertilidade e, ao contrário do sugerido pelos estudos  animais, estas gravidezes não apresentam aumento da frequência de aborto nem de  malformações congénitas quando comparadas com as da população em  geral<SUP>82</SUP>.</P>     ]]></body>
<body><![CDATA[<P><I>Efeitos sobre o desenvolvimento</I></P>     <P>Após administração materna, a maior parte dos agentes citostáticos atingem o  embrião/feto em concentrações significativas, uma vez que a placenta não  representa uma barreira eficaz contra estes agentes<SUP>80</SUP>. A exposição  <I>in utero</I> a citostáticos tem efeitos imediatos comprovados sobre o  desenvolvimento embrionário e fetal, que vão depender, em parte, da idade  gestacionária. A exposição muito precoce, logo após a conceção, quando o embrião  apresenta uma relativa resistência aos efeitos teratogénicos dos citostáticos,  traduz-se habitualmente em morte embrionária e aborto espontâneo<SUP>80</SUP>.  Da exposição durante o período de organogénese, que decorre durante o primeiro  trimestre, é expectável que possam surgir malformações fetais. Os efeitos  teratogénicos do metotrexato, por exemplo, são relativamente bem conhecidos: a  exposição pré-natal a este agente, durante fases críticas da embriogénese (o  período mais crítico parece ocorrer entre as 6 e as 8 semanas), causa uma  síndrome característica com múltiplas malformações<SUP>83</SUP>. Também para a  ciclofosfamida foi descrita, como consequência da exposição materna durante o  primeiro trimestre, uma síndrome característica de malformações  congénitas<SUP>84</SUP>. Globalmente, a terapêuticos citostáticos durante o 1.°  trimestre da gravidez associa-se a malformações major em 10-20% dos fetos,  atingindo de forma semelhante todos os órgãos e sistemas<SUP>83</SUP><SUP>,  </SUP><SUP>84</SUP><SUP>, </SUP><SUP>85</SUP><SUP>, </SUP><SUP>86</SUP>. O risco  de anomalias após quimioterapia administrada durante o 2.° e o 3.° trimestres é  provavelmente baixo, embora tenham sido descritos casos de atraso de crescimento  e mielossupressão fetal como consequência de terapêutica no 3.°  trimestre<SUP>87</SUP>.</P>     <P>Mais difíceis de avaliar são as repercussões a longo prazo da exposição <I>in  utero</I> a citostáticos. Foram estudados os efeitos sobre a função intelectual  e neurológica, uma vez que o sistema nervoso se continua a desenvolver após o  1.° trimestre e é sensível às agressões durante todo o período de gestação –  estas poderão não ter tradução em termos de defeitos anatómicos, mas resultar  num deficiente desenvolvimento a longo prazo<SUP>80</SUP>. Estão publicados 2  estudos avaliando o desenvolvimento neurocognitivo a longo prazo em crianças  expostas a citostáticos <I>in utero</I> e, em ambos, não foram detetatadas  diferenças relativamente a valores de controlo comparáveis<SUP>80</SUP>.</P>     <P>Outro aspeto consiste na possibilidade de efeitos relacionados com mutações  não letais, sem tradução imediata, que poderiam resultar num futuro aumento do  risco de cancro. Esta possibilidade é levantada pelos resultados de alguns  estudos experimentais em animais, demonstrando, por exemplo, que a exposição  <I>in utero</I> de células germinais hematopoiéticas ao etoposido em baixas  doses é suficiente para provocar aumento das quebras do ADN e induzir  translocações específicas, envolvendo o gene MLL<SUP>88</SUP>. Estas alterações  genéticas são semelhantes às descritas nas LMA do adulto que surgem após  terapêutica com este tipo de citostáticos, tendo sido sugerido que a exposição  materna a estes agentes aumentaria o risco de um tipo particular de leucemia que  surge nos primeiros 12 meses de vida (Leucemia Aguda Infantil) e que apresenta  como anomalia genética característica precisamente a presença de rearranjos do  gene MLL. No Homem está demonstrada a presença, em descendentes de mães tratadas  com citostáticos durante a gravidez, de anomalias cromossómicas estáveis, como,  por exemplo, a translocação recíproca equilibrada entre os cromossomas 5 e 20  associada ao metotrexato<SUP>86</SUP>. Num estudo envolvendo 217 mães tratadas  com quimioterapia durante a gravidez<SUP>89</SUP> foram detetados 2  recém-nascidos portadores de anomalias cromossómicas estáveis sugerindo que este  fenómeno, embora relativamente raro, pode ocorrer.</P>     <P>Estes dados dizem respeito à exposição a doses elevadas de citostáticos, no  contexto da terapêutica de doenças neoplásicas. A questão sobre se a exposição  crónica a baixos níveis destes agentes, no contexto profissional, se pode também  repercutir de forma adversa sobre a reprodução ou sobre o desenvolvimento  embrio-fetal é um assunto ainda em aberto. Os efeitos mais investigados e sobre  os quais existem dados mais consistentes são o aborto espontâneo e as  malformações congénitas.</P>     <P>Relativamente ao risco de aborto espontâneo, nos anos 80,  Selevan<SUP>90</SUP> publicou um primeiro estudo caso-controlo conduzido em  enfermeiras de 17 hospitais finlandeses, tendo detetado uma associação  significativa entre exposição a citostáticos e perda fetal (OR = 2,30). Por  outro lado, na mesma altura, em outro estudo semelhante, conduzido por  Hemminki<SUP>91</SUP>, e que incluiu 217 casos e 571 controlos, não se verificou  associação significativa entre exposição a citostáticos e risco de aborto  espontâneo (OR = 0,8). Já nos anos 90, Stucker<SUP>92</SUP> publica um terceiro  estudo de caso-controlo, realizado em 4 hospitais franceses, no qual é  evidenciado, em profissionais expostas a citostáticos, um aumento do risco de  aborto espontâneo (OR = 2,0); Skov<SUP>70</SUP>, pelo contrário, num estudo  também caso-controlo (incluindo 1.282 enfermeiras de oncologia e 2.572 outras  enfermeiras) não verificou associação entre exposição a citostáticos e aborto  (OR = 0,76). Valanis<SUP>93</SUP> publicou também um estudo caso-controlo  transversal, incluindo 2.976 enfermeiras e técnicas de farmácia, referindo  existir associação significativa entre exposição a citostáticos durante a  gravidez e risco de aborto espontâneo (OR = 1,5). Na meta-análise de  Dranitsaris<SUP>64</SUP>, que inclui todos os estudos referidos, conclui-se  haver uma associação de fraca intensidade entre exposição a citostáticos e  aborto (RR = 1,64).</P>     <P>Existem diversos estudos referindo um aumento da frequência de malformações  congénitas em profissionais expostas a agentes citostáticos.  Hemminki<SUP>91</SUP> refere, num estudo caso-controlo (46 casos versus 128  controlos), um risco aumentado de malformações congénitas (OR = 4,7). Também nos  anos 80, McDonald<SUP>94</SUP> refere, num grupo de 152 grávidas com história de  manipulação de citostáticos durante a gravidez, 8 anomalias congénitas versus  4,05 esperadas (p = 0,05). Mais recentemente, em outro estudo de  caso-controlo<SUP>95</SUP> que envolveu 851 gravidezes, 100 das quais associadas  a fenda palatina, e 751 com recém-nascidos saudáveis, foi assinalada uma relação  entre exposição ocupacional a agentes antineoplásicos e fenda palatina (OR =  5,0). Também Walusiak<SUP>63</SUP> refere um aumento de malformações congénitas  em profissionais expostas a citostáticos durante a gravidez (4/84 gravidezes  versus 1/169 gravidezes) e, posteriormente, Ratner et al.<SUP>77</SUP> descrevem  um aumento da frequência de malformações congénitas do olho (OR = 3,46 para IC =  95%). Em sentido contrário, Skov<SUP>70</SUP>, num estudo caso-controlo com  1.282 enfermeiras expostas a citostáticos e 2.572 enfermeiras controlo, não  detetou aumento da frequência de malformações congénitas nas expostas (OR =  1,02). Numa perspetiva geral, assinale-se a meta-análise já citada<SUP>64</SUP>,  incluindo todos os trabalhos publicados entre 1966 e 2004, que não revelou  associação significativa entre exposição a citostáticos e malformações  congénitas (OR = 1,46).</P>     <P>Outros efeitos estudados na área da reprodução incluem a gravidez ectópica,  com a qual não foi detetada associação<SUP>96</SUP>, a disfunção menstrual, com  a qual foi referida uma associação positiva com OR = 3,4<SUP>97</SUP> e a  redução da fertilidade feminina, igualmente com associação positiva, OR =  1,5<SUP>98</SUP>. Do nosso conhecimento, não existem estudos publicados  avaliando possíveis efeitos tardios sobre os descendentes de mães com exposição  ocupacional a citostáticos durante a gravidez, nomeadamente sobre o  desenvolvimento neurocognitivo e o risco de cancro. O facto de estes efeitos não  terem sido cabalmente comprovados no caso da exposição terapêutica, com doses  elevadas durante curtos períodos de tempo, não significa necessariamente que não  existam efeitos da exposição profissional, com doses baixas mas ocorrendo  durante períodos muito mais prolongados. Como dado indireto, uma revisão de  Savitz<SUP>99</SUP> incidindo sobre diversos estudos epidemiológicos que  procuraram correlacionar a profissão materna e paterna com a incidência de  cancro nos descendentes, concluiu existir evidência de uma associação forte  entre a ocupação materna como técnica de farmácia e a incidência de leucemia (OR  = 3,2).</P>     <p>&nbsp;</p>     <P><B>Outros efeitos crónicos sobre a saúde</B></P>     ]]></body>
<body><![CDATA[<P>Existem alguns dados, embora escassos e geralmente em estudos de pequena  dimensão, sobre outros efeitos crónicos para a saúde da exposição ocupacional a  citostáticos. Os mais documentados são os que ocorrem sobre o sistema  imunitário. Nos anos 80, Jochimsen<SUP>100</SUP> comparou alguns parâmetros  hematológicos de enfermeiras com exposição a citostáticos em situação basal e  após um teste de estimulação com prednisolona, com o objetivo de averiguar se  existiam anomalias fenotípicas subclínicas semelhantes às descritas em doentes  submetidas a quimioterapia adjuvante para a neoplasia da mama, não tendo  verificado diferenças significativas. Mais recentemente, Spatari<SUP>101</SUP>  descreve, num pequeno número de trabalhadores expostos a antineoplásicos (n =  17) um aumento significativo dos níveis circulantes de IL-15 e sugere que estes  poderiam corresponder a um aumento da expressão endógena como resposta defensiva  antitumoral. Num outro estudo recente<SUP>102</SUP> foi efetuada  imunofenotipagem dos linfócitos e estudada a função dos neutrófilos do sangue  periférico em 306 enfermeiras expostas a antineoplásicos. Os autores descrevem  algumas diferenças significativas em relação ao grupo controlo, nomeadamente, um  aumento da proporção de linfócitos B e uma diminuição da frequência de  linfócitos T <I>helper</I> ativados CD25+ (o marcador CD 25 corresponde à cadeia  &#945; do recetor de alta afinidade para a interleucina 2, indutível com a ativação  destas células) e ainda um aumento da resposta oxidativa dos neutrófilos quando  estimulados, sugerindo um <I>priming</I> prévio induzido pela exposição crónica  a citostáticos. Nenhum estudo demonstra, no entanto, que estas anomalias  fenotípicas do sistema imunitário tenham algum tipo de impacto no seu normal  funcionamento. Ainda no que respeita ao sistema imunitário, estão bem  documentados, embora sejam raros, casos esporádicos de reações alérgicas a  alguns tipos de citostáticos. Estão descritos casos de asma ocupacional  relacionada com a mitoxantrona<SUP>103</SUP> e os derivados da  platina<SUP>104</SUP> e um caso de rinossinusite atribuída ao  etoposido<SUP>105</SUP>.</P>     <P>O facto de as antraciclinas se associarem, em doentes tratados, a efeitos  cutâneos, tanto por ação sistémica como por contacto direto, levou a que fossem  estudados os efeitos cutâneos da exposição ocupacional. Demonstrou-se que a  doxorrubicina permeia regularmente as luvas e, quando incubada com uma cultura  celular de queratinocitos, é diretamente tóxica para estas células, induzindo  apoptose por um mecanismo p53-independente<SUP>106</SUP>.</P>     <P>Alguns citostáticos, nomeadamente os derivados da platina, são nefrotóxicos  em doentes submetidos a quimioterapia. Nos anos 90, Sessink<SUP>107</SUP>  analisou parâmetros laboratoriais de lesão renal precoce (doseamento urinária da  <I>Retinol Binding Protein</I> e da albumina) em profissionais expostos a  citostáticos e não encontrou diferenças em relação a um grupo controlo não  exposto.</P>     <P>Em 1983, Sotaniemi<SUP>108</SUP> descreve 3 casos de lesão hepática grave com  fibrose em enfermeiras, que atribuiu à exposição a citostáticos, mas nenhum  estudo posterior veio confirmar ou infirmar estes achados.</P>     <p>&nbsp;</p>     <P><B>Observações finais</B></P>     <P>A contaminação do ambiente de trabalho com agentes antineoplásicos é um fator  de risco inerente à atividade de muitos profissionais de farmácia e enfermagem.  É indiscutível que esta contaminação permeia todos os equipamentos de proteção  individual utilizados e se traduz na absorção, maior ou menor, destes agentes e  em efeitos genotóxicos, demonstrados sobretudo ao nível do sangue periférico. Em  termos globais e na maior parte dos países, é indiscutível que se registaram  melhorias substanciais como resultados da adoção das atuais normas de segurança.  A título de exemplo, encontram-se resumidas na Quadro 3 as principais  recomendações do NIOSH<SUP>109</SUP> <I>(National Institute for Occupational  Safety and Health)</I> nos EUA.</P>     <p>&nbsp;</p>     <p><b><a href="/img/revistas/rpsp/v30n1/30n1a10q3.jpg" target="_blank">Quadro 3</a></b> <b>Principais medidas de controlo do risco propostas  pela NIOSH nas atividades de preparação e administração de Citostáticos<sup>116</sup></b></p>     
<p>&nbsp;</p>     ]]></body>
<body><![CDATA[<P>No início desta década, Fransman<SUP>110</SUP> analisou conjuntamente os  resultados de 3 estudos transversais de avaliação da exposição (1997, 2000 e  2002) e referiu uma redução substancial da contaminação de luvas e superfícies  de trabalho, não só em termos da quantidade de citostáticos presentes mas também  em termos da extensão global das zonas contaminadas. Esta redução da  contaminação ambiental foi acompanhada por uma diminuição da percentagem de  profissionais de enfermagem expostos com ciclofosfamida detetável na urina,  tanto ao nível do hospital de dia (6,6 para 1,7%) como do internamento (12,4  para 2,9%). Também Sottani<SUP>111</SUP> estudou a evolução da contaminação de  superfícies e da percentagem de profissionais com biomarcadores de exposição na  urina em 5 farmácias italianas no período entre 1990 e 2010. Registou redução  dos níveis de contaminação de superfícies e da frequência de biomarcadores de  exposição positivos (30% dos profissionais nos anos 90 versus 2% na década  2000-2010. Turci<SUP>112</SUP> refere também que, ao longo de um período de  vigilância de 5 anos, foi verificada em 7 hospitais do Norte de Itália uma  redução progressiva quer da contaminação de superfícies quer da percentagem de  biomarcadores de exposição na urina positivos – de cerca de 30% na década de 90  para 2% após 2000.</P>     <P>Com base nestes dados e na análise da literatura, parece evidente que  atualmente, nas condições de exposição verificadas na maior parte dos países de  origem das publicações, o risco de efeitos agudos para a saúde é praticamente  inexistente fora do contexto da exposição acidental a doses elevadas de  citostáticos. Tal não invalida que, em determinados locais de trabalho, com  maiores níveis de contaminação e menor nível de proteção dos trabalhadores,  relacionado por exemplo, com ausência de procedimentos de segurança ou uso  insuficiente ou inadequado de equipamentos de proteção individual, não possa  existir sintomatologia aguda associada a estes agentes. Exemplos de trabalho  recentes que fogem à tendência referida para uma redução progressiva nos níveis  de exposição são os de Rekhadevi<SUP>113</SUP>, proveniente da Índia, e o de  Krstev<SUP>62</SUP>, proveniente da Sérvia, em que a baixa percentagem de  cumprimento de diversas regras de proteção se associou a uma elevada prevalência  de sintomas sugestivos de toxicidade aguda dos citostáticos, como alopécia e  <I>rash</I> cutâneo.</P>     <P>Já em termos de efeitos crónicos, nomeadamente, aumento do risco de  determinados cancros e repercussão sobre a reprodução e o desenvolvimento,  estamos longe de poder efetuar qualquer afirmação com segurança. Consoante é bem  evidenciado pela meta-análise de Dranitasaris<SUP>64</SUP>, os dados publicados  são insuficientes para retirar qualquer conclusão. Do conhecimento que se tem  sobre mecanismos de genotoxicidade ressalta, no entanto, que as melhorias  verificadas na maior parte dos locais de trabalho não serão provavelmente  suficientes enquanto continuarem a existir trabalhadores com biomarcadores  positivos. Para a maior parte dos citostáticos é postulado existir, para os  efeitos genotóxicos, uma curva dose-resposta linear, sem efeito limiar de dose  discernível (efeitos de tipo estocástico)<SUP>114</SUP>. Embora este modelo  tenha sofrido ultimamente alguma contestação e, indiscutivelmente, alguns  citostáticos não apresentem uma curva dose-resposta linear mas sim exponencial,  sugerindo que possa existir um limiar de dose, para a maior parte das respostas  genotóxicas, este limiar não parece existir<SUP>115</SUP>. Sendo portanto  impossível, com base no conhecimento científico atual, determinar um nível de  exposição abaixo do qual se possa assegurar a inexistência de efeitos adversos,  deve tentar-se que a contaminação ambiental seja tão baixa quanto possível  (<I>As Low as Reasonably Achievable – ALARA</I>)<SUP>116</SUP>.</P>     <P>Outro fator importante a considerar é o local onde cada estudo é efetuado,  com as suas características específicas. Os resultados obtidos num determinado  contexto ocupacional não podem ser usados para avaliar o risco noutro contexto  ocupacional diferente, com uma população exposta de características também  diferentes. São exemplos os trabalhos já referidos de Rekhadevi<SUP>113</SUP> e  Krstev<SUP>62</SUP> e um estudo recente conduzido no Japão<SUP>117</SUP>  revelando que os profissionais de enfermagem, numa percentagem substancial de  casos, não trabalhavam abrangidos pelas medidas de proteção atualmente  recomendadas, referindo nomeadamente desconhecimento de recomendações  específicas (47% casos), manipulação de citostáticos fora de câmaras de fluxo  laminar (42% casos), não utilização de qualquer equipamento de proteção  individual (10% casos), manipulação inadequada de frascos e ampolas contendo  antineoplásicos (25% casos) e ausência de precauções especiais no contacto com  excreções e secreções de doentes tratados (92% casos). Uma percentagem  significativa destes profissionais (44%) referia ainda pelo menos um acidente de  trabalho com exposição a citostáticos. Tais achados justificam que cada situação  de trabalho concreta tenha de ser alvo de estudo, para avaliar de forma correta  o risco dos profissionais que nela estão inseridos.</P>     <p>&nbsp;</p>     <P><B>Bibliografía</B></P>     <!-- ref --><P>1. Yamada T, Odawara K, Kaneko H. Concurrent detection of gene mutations and  chromosome aberrations induced by five chemicals in a CHL(IU cell line  incorporating a gpt shuttle vector. Mutat Res. 2000; 471:29–36.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000089&pid=S0870-9025201200010001000001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </P>     <!-- ref --><P>2. Boos G, Stopper H. Genotoxicity of several clinically used topoisomerase  II inhibitors. 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<body><![CDATA[<p>&nbsp;</p>     <P><I>Recebido em 20 de Junho de 2011</I></P>     <P><I>Aceite em 4 de Janeiro de 2012</I></P>      ]]></body><back>
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