There are 4 main stages of tumour size in stomach cancer. T1 means the tumour has started to grow into the wall of the stomach. It’s divided into T1a and T1b: T1a means the tumour is within the inner ...
View Full Profile. Learn about our Editorial Policies. “In many ways, it recapitulates the [gastrointestinal] system because the cell bodies of neurons within the gut wall are in a different layer, ...