A primary or metastatic malignant tumor involving the prostate gland. The vast majority are carcinomas. The disease is Monarch Disease Ontology identifier MONDO_0008315 (prostate cancer). Also known as: NGP - new growth of prostate, cancer of prostate gland, malignant neoplasm of prostate, malignant neoplasm of prostate gland, malignant neoplasm of the prostate, malignant prostate gland neoplasm, malignant prostate neoplasm, malignant prostate tumor.