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Table 1 The 7th and 8th editions of the American Joint Cancer Committee (AJCC) staging definitions for invasive intraductal papillary mucinous neoplasms (IPMN) with cross-tabulation of stage distributions

From: AJCC 7th edition staging classification is more applicable than AJCC 8th edition staging classification for invasive IPMN

7th edition 8th edition
T1 Limited to the pancreas, ≤ 2 cm in greatest dimension T1 Maximum tumor diameter ≤ 2 cm
T2 Limited to the pancreas, > 2 cm in greatest dimension T2 Maximum tumor diameter > 2 ≤ 4 cm
T3 Beyond the pancreas but without involvement of the celiac axis or the superior mesenteric artery T3 Maximum tumor diameter > 4 cm
T4 Involvement of celiac axis or the superior mesenteric artery (unresectable tumor) T4 Involvement of celiac axis or the superior mesenteric artery (unresectable tumor)
N0 No regional lymph node metastasis N0 No regional lymph node metastasis
N1 Regional lymph node metastasis N1 Metastasis in 1–3 regional lymph nodes
   N2 Metastasis in ≥ 4 regional lymph nodes
M0 No distant metastasis M0 No distant metastasis
M1 Distant metastasis M1 Distant metastasis
Stage T N M Stage T N M
IA T1 N0 M0 IA T1 N0 M0
IB T2 N0 M0 IB T2 N0 M0
IIA T3 N0 M0 IIA T3 N0 M0
IIB T1–3 N1 M0 IIB T1–3 N1 M0
III T4 Any N M0 III Any T N2 M0
      T4 Any N M0
IV Any T Any N M1 IV Any T Any N M1
Edition 8th
IA IB IIA IIB III IV
7th IA 124 0 0 0 0 0
IB 0 64 69 0 0 0
IIA 31 80 79 0 0 0
IIB 0 0 0 207 107 0
III 0 0 0 0 45 0
IV 0 0 0 0 0 410