You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is T2N1 of CA GB represents which stage and explain in detail?
According to 8th AJCC (2017) TNM classification of carcinoma Gallbladder T2- Invade the perimuscular connective tissue T2a- Invade the perimuscular connective tissue on the peritoneal side with no extension to serosa T2b- Invade the perimuscular connective tissue on hepatic side with no extension into the liver Stage IA - T1aN0M0 Stage IB - T1bN0M0 Stage IIA- T2aN0M0 Stage IIB- T2bN0M0 Stage IIIA- T3N0M0 Stage IIIB- T1-3N1M0 Stage IVA - T4N0-1 M0 Stage IVB- Tany N2M0, Tany Nany M1 Ref: Sabiston 20th edition Pgno :1512-1514