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Table 6. Histologic Grading Systema

GXGrade cannot be assessed.
G1Well differentiated.
G2Moderately differentiated.
G3Poorly differentiated.
G4Undifferentiated.

G = grade
aReprinted with permission from AJCC: Exocrine and endocrine pancreas. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 241-9.