Editing GIST (section)

== '''Staging''' ==

* See prognostic table based on     stage under 'prognosis'

{| class="wikitable"
|'''Primary tumor (T)'''
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|'''T category'''
|'''T criteria'''
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|TX
|Primary tumor  cannot be assessed
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|T0
|No evidence of  primary tumor
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|T1
|Tumor 2 cm or less
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|T2
|Tumor more than 2  cm but not more than 5 cm
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|T3
|Tumor more than 5  cm but not more than 10 cm
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|T4
|Tumor more than 10  cm in greatest dimension
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|'''Regional lymph nodes (N)'''
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|'''N category'''
|'''N criteria'''
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|N0
|No regional lymph  node metastasis or unknown lymph node status
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|N1
|Regional lymph  node metastasis
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|'''Distant metastasis (M)'''
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|'''M category'''
|'''M criteria'''
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|M0
|No distant  metastasis
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|M1
|Distant metastasis
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|'''Mitotic rate ('grade') in Sabiston'''
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|'''Mitotic rate'''
|'''Definition'''
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|Low
|Five or fewer mitoses per 5 mm2
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|High
|Over five mitoses per 5 mm2
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|'''Prognostic stage groups'''
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|'''Gastric and omental GIST'''
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|'''When T is...'''
|'''And N is...'''
|'''And M is...'''
|'''And mitotic rate is...'''
|'''Then the stage group is...'''
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|T1 or T2
|N0
|M0
|Low
|IA
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|T3
|N0
|M0
|Low
|IB
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|T1
|N0
|M0
|High
|II
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|T2
|N0
|M0
|High
|II
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|T4
|N0
|M0
|Low
|II
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|T3
|N0
|M0
|High
|IIIA
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|T4
|N0
|M0
|High
|IIIB
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|Any T
|N1
|M0
|Any rate
|IV
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|Any T
|Any N
|M1
|Any rate
|IV
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|'''Small intestinal, esophageal, colorectal,  mesenteric, and peritoneal GIST'''
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|'''When T is...'''
|'''And N is...'''
|'''And M is...'''
|'''And mitotic rate is...'''
|'''Then the stage group is...'''
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|T1 or T2
|N0
|M0
|Low
|I
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|T3
|N0
|M0
|Low
|II
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|T1
|N0
|M0
|High
|IIIA
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|T4
|N0
|M0
|Low
|IIIA
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|T2
|N0
|M0
|High
|IIIB
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|T3
|N0
|M0
|High
|IIIB
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|T4
|N0
|M0
|High
|IIIB
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|Any T
|N1
|M0
|Any rate
|IV
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|Any T
|Any N
|M1
|Any rate
|IV
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