What staging is
The stage of a cancer tells the doctor how far the cancer has spread. The tests and scans you have when diagnosing your cancer give some information about the stage. It is important because knowing the stage helps doctors decide on which treatment you need.
TNM stages of prostate cancer
Prostate cancer is staged using the TNM system. This is used all over the world. It separately assesses the tumour (T), lymph nodes (N) and secondary cancer (metastases – M).
This is the T (tumour) staging
- T1 – The tumour is too small to be seen on scans or felt during examination of the prostate (it may have been discovered by needle biopsy, after finding a raised PSA level).
- T2 – The tumour is completely inside the prostate gland – T2 tumours are divided into 3 smaller groups
- T2a – The tumour is in only half of one of the lobes of the prostate gland
- T2b – The tumour is in more than half of one of the lobes
- T2c – The tumour is in both lobes but is still inside the prostate gland
- T3 – The tumour has broken through the capsule (covering) of the prostate gland
- T4 – The tumour has spread into other body organs nearby, such as the rectum (back passage) or bladder.
Stage T3 and T4 tumours are referred to as locally advanced prostate cancer.
Lymph nodes are described as being ‘positive’ if they contain cancer cells. If a lymph node has cancer cells inside it, it is usually bigger than normal. The more cancer cells it contains, the bigger it will be.
This is the N (lymph node) staging
- N0 – No cancer cells found in any lymph nodes
- N1 – One positive lymph node smaller than 2cm across
- N2 – More than one positive lymph node. Or one that is between 2 and 5cm across
- N3 – Any positive lymph node that is bigger than 5 cm across
This is the staging for metastases (cancer spread)
- M0 – No cancer has spread outside the pelvis
- M1 – Cancer has spread outside the pelvis
So, a cancer described as T2 N0 M0 would be
- A cancer that is entirely within the prostate
- With no cancer spread to lymph nodes
- And no spread to areas outside the pelvis
The number stages of prostate cancer
This way of staging takes into account the size of the tumour, whether there are cancer cells in lymph glands (also called lymph nodes) close to the prostate gland, and whether the tumour has spread anywhere else.
Prostate cancer has four basic stages which are
- Stage 1 – the cancer is very small and completely inside the prostate gland which feels normal during a rectal examination
- Stage 2 – the cancer is still inside the prostate gland, but is larger and a lump or hard area can be felt during a rectal examination
- Stage 3 – the cancer has broken through the covering of the prostate and may have grown into the tubes which carry semen
- Stage 4 – the cancer has grown into the bladder or rectum, or has spread to the lymph nodes or another part of the body, such as the bones, liver or lungs
How prostate cancer spreads
Prostate cancer tends to spread to the bones rather than any other organs. With prostate cancer, it is sometimes possible to have metastases (cancer spread) present even when the prostate tumour is still very small. So even if the tumour appears to be very small, when a bone scan shows that there is cancer in the bones, the prostate cancer is M1 stage and will be treated as advanced, metastatic cancer. This can often be controlled for several years with treatment.
adapted from http://www.cancerhelp.org.uk/
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