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O câncer surge a partir de mutações genéticas no DNA das células. Essas alterações podem ocorrer em genes especiais chamados proto-oncogenes, que inicialmente são inativos em células normais. Quando ativados, esses proto-oncogenes se transformam em oncogenes, responsáveis por converter células normais em células cancerosas1. Basicamente, o processo de formação do câncer é chamado de carcinogênese ou oncogênese e acontece lentamente, podendo levar anos para que uma célula cancerosa se multiplique
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