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DICAS E CONCURSOS

Sensor detecta câncer de mama seis meses antes de nódulo aparecer.

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Dispositivo criado pela Unicamp tem o tamanho de uma moeda. No Brasil surge um novo caso da doença a cada nove minutos.

cancer-mama

Uma pesquisa inédita da Unicamp desenvolveu um equipamento que pode detectar a formação do câncer de mama seis meses antes de algum nódulo aparecer. O dispositivo, que tem o tamanho de uma moeda, possui 64 sensores. Segundo os pesquisadores, quando ele recebe sangue, transforma reação química em corrente elétrica e a partir de gráficos, ele mostra a concentração de uma proteína que se multiplica quando a doença aparece: a HER2.
“Meses antes de desenvolver o câncer de mama, essa proteína começa a ser liberada no sangue. Baseada nessa proposta, a gente tentou criar um dispositivo que fosse capaz de detectar essa proteína em concentrações bem baixas”, afirma a pesquisadora Cecília de Carvalho e Silva.

Grafite de lápis
Normalmente, um microchip é feito de silício, mas para desenvolver a tecnologia, os pesquisadores da Unicamp utilizaram um outro material, o grafeno, que é basicamente grafite de lápis.
O método permite detectar a formação do câncer de mama seis meses antes da formação do nódulo e também poderia ajudar no tratamento, monitorando o nível da proteína durante a realização da quimioterapia.
“Para saber qual estágio do câncer essa mulher se encontra”, afirma a pesquisadora.

Nanotecnologia
Foram quatro anos de pesquisa do departamento de química da Unicamp em parceria com a equipe de engenharia elétrica para que o microchip pudesse ter contato com um líquido sem provocar o curto-circuito dos componentes. A nanotecnologia empregada é de fácil adaptação a outros equipamentos, como um smartphone, por exemplo. Segundo o pesquisador Lauro Tatsuo Kubota, a tecnologia pode ser utilizada fora dos laboratórios. “Pode ser no próprio consultório médico ou em casa”, explica.
O equipamento pode se tornar uma prevenção ao tipo de câncer que mais mata mulheres no mundo, de acordo com a Organização Mundial de Saúde. São mais de 8 milhões de mortes todo ano.
No Brasil surge um caso a cada 9 minutos e metade dos diagnósticos acontece em estágio avançado, onde o tratamento é mais difícil.
“O ideal é que nos façamos o diagnóstico da doença antes dela ser palpável, antes dela ser percebida pela paciente”, afirma Cássio Cardoso Filho, vice-diretor clínico do Caism, Hospital da Mulher da Unicamp.
No entanto, antes de ser feito teste em sangue humano, o dispositivo tem que ser aprovado pelo Conselho de Ética da Unicamp e não existe previsão de data para isso acontecer.(G1)

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