Procedure:
Excisional biopsy
Resection Specify type (eg, partial gastrectomy):
Metastasectomy
Other (specify):
Not specified

Tumor Site:

Tumor Size:
   Greatest dimension: cm
   Additional dimensions: cm
   Cannot be determined (see Comment)

Tumor Focality:
Unifocal
Multifocal, tumors, size:

GIST Subtype:
Spindle cell
Epithelioid
Mixed
Other (specify):

Mitotic Rate
/50 HPF

Note: The required total count of mitoses is per 5 mm2 on the glass slide section. With the use of older model microscopes, 50 HPF is equivalent to 5 mm2. Most modern microscopes with wider 40X lenses/fields require only 20 HPF to embrace 5 mm2. If necessary please measure field of view to accurately determine actual number of fields required to be counted on individual microscopes to count 5 mm2.

Necrosis:
    Not identified
    Present, Extent: %
    Cannot be determined

Histologic Grade:
GX: Grade cannot be assessed
G1: Low grade; mitotic rate ≤5/50 HPF
G2: High grade; mitotic rate >5/50 HPF

Risk Assessment:
None
Very low risk
Low risk
Intermediate risk
High risk
Overtly malignant/metastatic
Cannot be determined

Margins:
Cannot be assessed
Negative for GIST, distance of tumor from closest margin: cm
Margin(s) positive for GIST:

Pathologic Staging (pTNM) (Note G)

TNM Descriptors:
       m (multiple)
       r (recurrent)
       y (posttreatment)

Primary Tumor (pT):
pTX: Primary tumor cannot be assessed
pT0: No evidence for primary tumor
pT1: Tumor 2 cm or less
pT2: Tumor more than 2 cm but not more than 5 cm
pT3: Tumor more than 5 cm but not more than 10 cm
pT4: Tumor more than 10 cm in greatest dimension

Regional Lymph Nodes (pN):
pN0: No regional lymph node metastasis
pN1: Regional lymph node metastasis

Distant Metastasis (pM):
    Not applicable
    pM1: Distant metastasis:

Additional Pathologic Findings:

Ancillary Studies:
       Immunohistochemical Studies:
           KIT (CD117):
            Positive
            Negative
           Others (specify):
           Not performed
       Molecular Genetic Studies (eg, KIT or PDGFRA mutational analysis):
        Submitted for analysis; results pending
        Performed, see separate report:
        Performed Specify method(s) and results:
        Not performed

Preresection Treatment:
   No therapy
   Previous biopsy or surgery:
   Systemic therapy performed:
   Therapy performed, type not specified
   Unknown

Treatment Effect: Percentage of viable tumor: %

Comment(s):