Which zone is the primary site for prostatic cancers?

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The main concept here is that prostate cancers most commonly originate in the peripheral zone, the outer portion of the gland that lies toward the back and sides. This zone contains the majority of prostatic glandular tissue, so malignant transformation happens more frequently there, making it the classic site for adenocarcinomas. Clinically, cancers in this zone are often detectable by digital rectal examination because they sit against the rectal wall, which is why screening exams focus on this area. In contrast, the transitional zone around the urethra is the usual site for benign prostatic hyperplasia, the central zone surrounds the ejaculatory ducts, and the anterior fibromuscular stroma contains little glandular tissue, making cancers there much rarer.