1.   Because it seems to lower a protein known as prostate specific antigen, it may make prostate cancer more difficult to detect.

2.   Despite treatment, his prostate specific antigen level, a marker of the disease, continued to rise.

3.   Giuliani said his cancer was detected at an early stage, chiefly the result of a blood test known as PSA for prostate specific antigen.

4.   Just as gynecologists stress serial Pap smears to catch cancers, urologists urge annual vigilance for men through the PSA, the prostate specific antigen.

5.   P.S.A. stands for prostate specific antigen.

6.   Screening consists of a rectal exam and an inexpensive blood test that detects prostate specific antigen, a protein produced in greater quantities by an enlarged or cancerous prostate.

7.   That changed with increasing use of the PSA, for prostate specific antigen.

8.   That test, the PSA, for prostate specific antigen, can lead to the detection of tiny tumors.

9.   The blood test measures a protein known as PSA, for prostate specific antigen.

10.   The men received digital rectal exams and blood tests for prostate specific antigen, a protein that, when found at elevated levels, may indicate prostate cancer.