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A histopathologic diagnosis of prostate cancer is the discernment of whether there is a cancer in the prostate, as well as specifying any subdiagnosis of prostate cancer if possible. The histopathologic subdiagnosis of prostate cancer has implications for the possibility and methodology of any subsequent Gleason scoring . [ 1 ]
For example, if the primary tumor grade was 2 and the secondary tumor grade was 3 but some cells were found to be grade 4, the Gleason score would be 2+4=6. This is a slight change from the pre-2005 Gleason system where the second number was the secondary grade (i.e., the grade of the second-most common cell line pattern).
Prostate cancer is a form of cancer that is typically slow-growing and originates in or on the prostate, a male reproductive gland that surrounds the urethra in proximity of the bladder and rectum. This is a result of malignant cells forming and multiplying at the prostate, which can then spread or metastasize to other organs in the body. [ 1 ]
There are several reasons why PIN is the most likely prostate cancer precursor. [3] PIN is more common in men with prostate cancer. High grade PIN can be found in 85 to 100% of radical prostatectomy specimens, [4] nearby or even in connection with prostate cancer. It tends to occur in the peripheral zone of the prostate.
Grading in cancer is distinguished from staging, which is a measure of the extent to which the cancer has spread. Pathology grading systems classify the microscopic cell appearance abnormality and deviations in their rate of growth with the goal of predicting developments at tissue level (see also the 4 major histological changes in dysplasia ).
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English: Chromogenic immunohistochemistry of benign gland (left) and adenocarcinoma (right) using the PIN-4 cocktail. The adenocarcinoma lacks the basal epithelial cells (stained dark brown by p63, CK-5 and CK-14). Also, in PIN-4 stained samples, adenocarcinoma cells generally display red cytoplasms (stained by AMACR, also known as P504S).
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