12 months since chemo and my cancer markers and chest xray look good. My oncologist is ordering a bone scan since I continue to have rib pain on my left hand (cancer) side. The chest xray cannot pick up an anterior rib tumor and tumor markers have a 20% false negative rate. Thus, out of a abundance of caution I'll have a bone scan. Its been 18 months since my original bone scan. I will feel a good deal of comfort having a clean bone scan result.