Stomach
Stromal / other tumors
Gastrointestinal stromal tumor - Staging

Author: Elliot Weisenberg, M.D. (see Authors page)

Revised: 19 December 2016, last major update July 2012

Copyright: (c) 2003-2016, PathologyOutlines.com, Inc.

PubMed Search: staging gastrointestinal stromal tumor
Table of Contents
Definition / general
Cite this page: Gastrointestinal stromal tumor - Staging. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/stomachgiststaging.html. Accessed June 24th, 2017.
Definition / general
  • Also applies to GIST of omentum
Primary tumor (T)
  • TX: Primary tumor cannot be assessed
  • T0: No evidence for primary tumor
  • T1: Tumor 2 cm or less
  • T2: Tumor more than 2 cm but not more than 5 cm
  • T3: Tumor more than 5 cm but not more than 10 cm
  • T4: Tumor more than 10 cm in greatest dimension
Regional lymph nodes (N)
  • NX: Regional lymph nodes cannot be assessed
  • N0: No regional lymph node metastasis
  • N1: Regional lymph node metastasis
Distant metastasis (M)
  • M0: No distant metastasis
  • M1: Distant metastasis
Anatomic stage / prognostic groups
  • Stage IA: T1-2 N0 M0 low mitotic rate
  • Stage IB: T3 N0 M0 low mitotic rate
  • Stage II: T1-2 N0 M0 high mitotic rate or T4 N0 M0 low mitotic rate
  • Stage IIIA: T3 N0 M0 high mitotic rate
  • Stage IIIB: T4 N0 M0 high mitotic rate
  • Stage IV: N1 or M1
  • Low mitotic rate: 5 or fewer per 50 HPF
  • High mitotic rate: over 5 per 50 HPF