病理學上,學界會訂出不同分級(grading)標準評估腫瘤的狀態。有些腫瘤分級僅用於惡性英語malignant腫瘤(癌症),有些則涵蓋良性腫瘤。一般來說,腫瘤的分級會參考細胞的分化情形[1]。腫瘤分級與分期(Staging)並不相同,分期是以臨床狀態及遠端轉移與否進行評估,分級則是藉由病理學的標準進行分類。

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