I just finished chemo in Jan. 2012. PCI in Feb. Onc ordered a Pet scan and insurance said it was not medically necessary but investigational, therefore it was denied. I have had 1 pet scan at diagnoses 9/11/11. I ct scan in Dec. 2011. What are your doctors doing to get approved? My insurance is not through work but I pay. BCBS. How does the insurance co think you can treat something you can't see. Talk about stress. I have no idea if my cancer has gotten better or worse since the ct scan in 2011. I guess they just hope you progress and die. I have Limited sclc. I pray it is still Limited.