Final answer:
Prostate cancer is the most common malignant tumor seen in men. It develops in the prostate gland of the male reproductive system and is usually found in men over the age of 50. Regular screening tests can help detect prostate cancer early.
Step-by-step explanation:
The most common malignant tumor seen in men is prostate cancer. Prostate cancer is a tumor that develops in the prostate gland of the male reproductive system. It is the most common type of cancer in men and accounts for about one third of all cancers in men. Prostate cancer is usually found in men over the age of 50. Regular screening tests, such as a blood test called the prostate-specific antigen (PSA) test, can help detect prostate cancer early.