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TNM system
The
TNM system
This is also sometimes called the International Mesothelioma
Interest Group staging system. The TNM system describes
the extent of the primary tumor (T), the absence or
presence of cancer in nearby lymph nodes (N), and the
absence or presence of distant metastases (M). Once
the TNM categories have been decided, this information
is grouped together to give the stage. Stage 1 is the
earliest stage and stage 4 is the most advanced stage.
Stage I :
Mesothelioma affects one layer of
the pleura only. It may have grown into pericardium
and the diaphragm
Stage II :
Mesothelioma has spread to both layers of
the pleura on one side of the body only
Stage III :
Mesothelioma has spread to the chest wall, food pipe
or lymph nodes on the same side of the chest
Stage IV :
Mesothelioma has spread via the bloodstream to other
organs in the body such as the liver, brain or bone
or to lymph nodes on the other side of the chest.
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