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Table 1 Commonly used criteria for assessing risk of GIST

From: Prognostic criteria in patients with gastrointestinal stromal tumors: a single center experience retrospective analysis

NIH criteria14  
   Very low < 2 cm and < 5 mitotic index
   Low 2-5 cm and < 5 mitotic index
   Intermediate 5-10 cm and < 5 mitotic index
  > 5 cm and 6-10 mitotic index or
   High > 5 cm and > 5 mittic index or
  > 10 cm and any mitotic index or
  Any size and > 10 mitotic index
AFIP criteria 16, 17  
   Unknown * Expect from following criteria
   Very low 5 cm and 5 mitotic index
   Low Gastric: > 5 cm and 10 cm and 5 mitotic index
  Others: > 2 cm and 5 cm, and 5 mitotic index
   Moderate Gastric: > 10 cm and 5 mitotic index or
  > 2 cm and 5 cm, and > 5 mitotic index
  Others: > 5 cm and 10 cm, and 5 mitotic index
   High Gastric: > 5 cm and > 5 mitotic index
  Others: > 10 cm or > 5 mitotic index
  1. * Category with small numbers of cases insufficient for prediction of malignant potential
  2. NIH: the National Institutes of Health
  3. AFIP: the Armed Forces Institute of Pathology
  4. Definition for risk categories in the National Institutes of Health and Armed Forces Institute of Pathology criteria.