Role Of PET Scan in CA Stomach

Q) What is not true about the role of PET Scan in staging of Ca Stomach?

a) 50% of Carcinoma stomach are PET avid

b) Response to Neoadjuvant therapy is  usually seen on PET in 2 weeks

c) PET response correlates with survival 

d) Sensitivity of PET is same for all kinds of histopath tumors