27. A 63-year-old woman has a long-standing gastric ulcer that shows a transition from normal mucosa to
areas of dysplasia and then to invasive adenocarcinoma. Which concept of carcinogenesis is BEST
illustrated by this sosequence?
(A) Paraneoplastic syndrome
(C) Tumor progression
(B) Field cancerization
(D) Grading of tumors

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