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a. Kaplan–Meier curve for different grades of tumor cell differentiation in the overall stage. b. Kaplan–Meier curve for different grades of tumor cell differentiation at early stage. c. Kaplan–Meier curve for different grades of tumor cell differentiation at advanced stage. d. Kaplan–Meier curve for different grades of tumor cell differentiation with early T stage (T1 and T2). e. Kaplan–Meier curve for different grades of tumor cell differentiation at N0 stage.
