Chromogranin, synaptophysin, and CD56 are IHC markers of small cell lung cancer. What percentage of SCLC are negative for these markers

Q. Chromogranin, synaptophysin, and CD56 are IHC markers of small cell lung cancer. What percentage of SCLC are negative for these markers

A.            10

B.            20

C.            15

D.            < 5

Answer: 10%