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General Medicine General 76ee4517

A 67 yr male with history of chronic smoking hemoptysis with cough. Bronchoscopic biopsy from centrally located mass shows undifferentiated tumor histopathologically. Most useful I.H.C. (immunohistochemical) marker to make a proper diagnosis would be:

A
Cytokeratin
B
Parvalbumin
C
HMB-45
D
Hep-par1

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