As many as 40% of newly diagnosed PCa patients have unifocal disease, that is, just one focus of cancer. But that still leaves 60-80% of patients with multifocal PCa. Without evidence to the contrary, multiple foci in the same gland were thought to be biologically homogeneous, that is, identical to each other.
Then, along came the tools to analyze PCa at the molecular level, bringing new knowledge of the biology of PCa.
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