I had my first PET scan a week ago. After 6 months on Xalkori the tumor is down from 5 cm to about 1 cm. It is considered "inactive". The pleural effusion seems to have increased some since my previous two CT scans. I don't have any symptoms and the fluid did not "light up" on the PET. My doctor would like to have some taken out and tested to see if there are cancer cells in it. Anyone have any thoughts on this? I'm also going to have another CT in 6 weeks to check the fluid.