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Table 6. WHO/ISUP Recommended Grading System

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

WHO = World Health Organization; ISUP = International Society of Urologic Pathology.
Reprinted with permission from AJCC: Urinary bladder. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, p 497.