We have the same questions here. My mom was diagnosed with stomach cancer Nov 06 has had every scan you can think of (CT, PET MUGA). All the scans showed that the cancer had not spread and she had surgery to remove her stomach in Mar 07. Several nodes removed during surgery showed cancer. She has since gone through more chemo and on Monday she had another PET scan and tomorrow we find out the results. Not sure if I feel we will ge an accurate reading. If they do not find anything I will still have this uneasy feeling since nothing showed up on the previous scans.