stage I Merkel cell carcinoma
Cancer
(... MER-kul ...) Stage I Merkel cell carcinoma is divided into stages IA and IB. In stage IA, the cancer is smaller than 2 centimeters in diameter and has not spread to lymph nodes or other parts of the body. In stage IB, the cancer is 2 centimeters or larger in diameter and has not spread to lymph nodes or other parts of the body.