Which of the following is true regarding EGFR mutations?

Q. Which of the following is true regarding EGFR mutations?

A.            found in 20% of NSCLC patients in the western world

B.            found in 50% of patients of NSCLC in East Asia

C.            Anti-PD-1 / PD-L1 therapies are not used in these patients

D.            all of the above

Answer: all of the above