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Two labels for a gallbladder cancer that has grown through the muscle layer but is still inside the gallbladder. T2a sits on the free side facing the abdominal cavity; T2b sits on the side pressed against the liver, spreads to nodes and vessels more often and roughly doubles the risk of dying, so the surgeon removes more liver for it.
The AJCC and UICC 8th edition (2017) split T2 by tumour location: T2a invades the perimuscular connective tissue on the peritoneal side without reaching the serosa, T2b on the hepatic side without liver invasion (CRUK stages and grades). The split rests on an international series of 437 resected patients: among 252 with T2 disease, hepatic-side tumours (99) had more vascular invasion (51 versus 19 percent), neural invasion (33 versus 8 percent) and nodal metastasis (40 versus 17 percent) than peritoneal-side tumours (153), and tumour location predicted recurrence pattern and survival (Shindoh 2015). A 2022 meta-analysis of 15 studies and 2,531 patients (1,332 T2a, 199 T2b classified) found overall survival significantly worse in T2b (hazard ratio 2.18) with more recurrence, and liver resection appeared to improve survival in T2b (Alrawashdeh 2022). Validation studies are mixed: a Korean series found T1b and T2a, and T2b and T3, hard to separate and suggested dropping the subcategories (Sung 2020), and the National Cancer Database validation called for prospective confirmation (Giannis 2021). In practice T2b is the stage at which a formal liver resection (segments IVb and V) is most argued for.
Most pancreatic cancers arise in the head next to the bile duct, which is why jaundice is the presenting sign; bile duct cancers are named by where along the tree they sit.
Same organ: Glucagonoma, VIPoma, Somatostatinoma, Pancreatic ductal adenocarcinoma, Biliary tract cancer (cholangiocarcinoma), Intrahepatic cholangiocarcinoma, Extrahepatic cholangiocarcinoma (perihilar and distal), Biliary tract cancer (all types), Neuroendocrine tumours, Pancreatic neuroendocrine tumours, Grade 3 well-differentiated neuroendocrine tumour, Extrapulmonary neuroendocrine carcinoma, Gallbladder adenocarcinoma, Papillary carcinoma of the gallbladder, Mucinous carcinoma of the gallbladder, Adenosquamous and squamous carcinoma of the gallbladder, Neuroendocrine carcinoma of the gallbladder, Incidental gallbladder cancer (found after cholecystectomy), Carcinoma in situ and dysplasia of the gallbladder, Cystic duct carcinoma, Ampullary cancer (ampulla of Vater), Resectable pancreatic ductal adenocarcinoma, Borderline resectable pancreatic ductal adenocarcinoma, Locally advanced unresectable pancreatic ductal adenocarcinoma, Metastatic pancreatic ductal adenocarcinoma, KRAS G12C-mutant pancreatic ductal adenocarcinoma, KRAS wild-type pancreatic ductal adenocarcinoma, BRCA or PALB2-mutant pancreatic ductal adenocarcinoma, Mismatch repair deficient (MSI-high) pancreatic ductal adenocarcinoma, Pancreatic acinar cell carcinoma, Intraductal papillary mucinous neoplasm and other pancreatic cystic precursors, Pancreatoblastoma, Adenosquamous carcinoma of the pancreas, Colloid (mucinous non-cystic) carcinoma of the pancreas, Undifferentiated carcinoma of the pancreas with osteoclast-like giant cells, Invasive carcinoma arising in an intraductal papillary mucinous neoplasm (IPMN-associated carcinoma), Mucinous cystic neoplasm of the pancreas with associated invasive carcinoma (MCN-associated carcinoma), Solid pseudopapillary neoplasm of the pancreas
Showing the organ this term concerns: Gallbladder cancer.
The prognostic split is solid; the surgical consequence is not. Whether T2a tumours can safely skip liver resection, and whether T2b tumours gain from it, is a randomised or prospective-registry question that nobody has yet run.
Consistent with Kang and colleagues on prognosis, and more optimistic about liver resection for T2b. The adjuvant chemotherapy finding is retrospective and predates gallbladder-specific analysis of BILCAP, but it is a warning that the adjuvant benefit in this disease is not established.
Anatomy alone explains only about two thirds of the ranking of who lives longer; the 2026 staging review makes the same point and argues for molecular and nodal-burden modifiers alongside TNM.
The staging change UK pathology reports now carry. Validation against the US National Cancer Database (Giannis 2021) found the eighth edition no better than the seventh at predicting survival overall.
One of the series that raised the question of sparing the liver resection in T2a disease; only 33 peritoneal-side tumours, so it poses the question rather than settles it.
The study behind the T2a/T2b split adopted by the AJCC eighth edition in 2017, the one staging change in gallbladder cancer that grew from the disease's own anatomy rather than from bile duct cancer.
Shares Surgery for gallbladder cancer: simple versus radical cholecystectomy, re-resection and lymphadenectomy, Gallbladder adenocarcinoma, Radical (extended) cholecystectomy, Gallbladder cancer and the tags gallbladder, biliary.
Shares Surgery for gallbladder cancer: simple versus radical cholecystectomy, re-resection and lymphadenectomy, Gallbladder adenocarcinoma, Radical (extended) cholecystectomy, Gallbladder cancer and the tags gallbladder, biliary.
Shares Surgery for gallbladder cancer: simple versus radical cholecystectomy, re-resection and lymphadenectomy, Radical (extended) cholecystectomy, Gallbladder cancer and the tags gallbladder, biliary.
Shares Gallbladder cancer roadmap: from a chance finding at gallstone surgery to a disease with its own trials, Gallbladder cancer and the tags gallbladder, biliary.
Shares Gallbladder cancer and the tags gallbladder, biliary.
Shares Gallbladder cancer and the tags gallbladder, biliary.
Shares Gallbladder cancer and the tags gallbladder, biliary.
Shares Gallbladder adenocarcinoma, Radical (extended) cholecystectomy, Gallbladder cancer and the tags gallbladder, biliary.