with a high survival rate of
91 per cent in canada, understanding the stages and progression of the disease is vital for canadian males who wish to reduce their risk of late-stage diagnosis.
understanding prostate cancer staging
in canada, there are two ways to determine the stage of prostate cancer: the tnm system and the staging system. the tnm system assesses the tumour and its characteristics, whether the cancer has spread to nearby lymph nodes, and whether it has metastasized or spread to other areas of the body.
the t in tnm can be used to determine the size and location of the tumour, whether it has grown to outside tissues, and whether it can be seen or felt in imaging tests or exams. there are four primary t levels: t1, t2, t3, and t4.
t1 tumours aren’t typically felt during a prostate exam or seen during imaging, but they can be tested through a needle biopsy. typically, cancer is found in small amounts, under or a bit more than five per cent of the removed tissue from the biopsy.
t2 is the marker used when the tumour is big enough to be felt during a prostate exam and can be seen on imaging tests. however, the diseased cells remain only in the prostate.
t3 is characterized by the tumour breaking through the outside layers of the prostate gland and into nearby tissues. it has not yet grown into the seminal vesicles.