American Liver Tumor Study Group modification of the TNM staging for hepatocellular cancer for the purpose of liver transplantation prioritization

T0	No tumor found
T1	One nodule, ≤1.9 cm
T2	One nodule, 2 to 5 cm; two or three nodules, all ≤3 cm
T3	One nodule, >5 cm; two or three nodules, at least one >3 cm
T4a	Four or more nodules of any size
T4b	T2, T3, or T4a, plus gross involvement of intrahepatic portal vein or hepatic vein, as indicated by CT, MRI, or ultrasonography
N1	Involvement of regional (porta hepatis) lymph nodes
M1	Metastatic disease including extrahepatic portal or hepatic vein involvement
Stage grouping
Stage I	T1
Stage II	T2
Stage III	T3
Stage IVA1	T4a
Stage IVA2	T4b
Stage IVB	Any N1 or M1

TNM: tumor, node, metastasis; CT: computed tomography; MRI: magnetic resonance imaging.

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