The prostate gland produces the liquid part of semen, which transports sperm. Normal human cells divide and grow in an orderly way, which helps to keep the body in good repair. Sometimes, however, normal cells begin to divide too rapidly. This uncontrolled cell growth forms a mass, or tumor. Tumors may cause pain but usually do not when they are small.
Some tumors are benign, or non-cancerous.
They do not spread to other parts of the body and usually are not life-threatening. Cancerous tumors are called malignant tumors. They can metastasize, or spread to other parts of the body and form new tumors. This is why it is important to find a malignant tumor as early as possible when the cancer may be treatable. Small amounts of this substance may get into the bloodstream and can be measured by the PSA test.