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Review Question - QID 6273

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QID 6273 (Type "6273" in App Search)
A 20-year-old man has a large soft-tissue mass behind his knee. MRI scans are shown in Figures 10a through 10c. Figure 10d shows a clinical photograph of his chest. The patient’s condition is most likely a result of a defect in what gene?
  • A
  • B
  • C
  • D

NF1

96%

452/471

EWS

0%

2/471

EXT1

1%

7/471

P53

1%

7/471

Rb

0%

2/471

  • A
  • B
  • C
  • D

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The patient has a plexiform neurofibroma and multiple café-au-lait spots, all characteristic of von Recklinghausen’s neurofibromatosis. This disease has been linked to a defect of the gene NF1 on chromosome 17. EWS is one of the genes associated with the 11;22 translocation found in Ewing’s sarcoma and several other sarcomas. EXT1 is the most common gene affecting patients with multiple hereditary exostosis. P53 and Rb are tumor suppressor genes whose inactivation has been associated with tumors in conditions such as Li-Fraumeni and retinoblastoma, respectively.

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