A 63 year old man undergoes colonoscopy after a positive stool DNA screening test. A 2.5 cm pedunculated adenoma is removed from the sigmoid colon. Molecular analysis of the adenoma demonstrates a mutation that promotes constitutive signaling through a GTP binding protein and drives progression from early to intermediate adenoma. Which gene is most likely mutated?

  1. A)RET
  2. B)WT1
  3. C)APC
  4. D)KRASGABARITO
  5. E)RB

Explicação

In the classic adenoma carcinoma sequence of sporadic colorectal cancer, APC loss is an early event and KRAS activation commonly promotes progression from a small adenoma to a larger, more dysplastic lesion. KRAS encodes a GTP binding signaling protein that be... Ver explicação completa e trilha adaptativa →

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