The Standard Uptake Value (SUV) is kind of a complex topic. Assuming you had your scan at the same place and there were no other physical changes (your weight, etc) a lower uptake value is definitely a good sign. Nonetheless, I would suggest you discuss it with your Radiologist. (FYI: there are no universal tables of SUV, say like height/weight scales).
Re "Maintenance Chemo": I am on "Maintenance Chemo" for the last 4 years, and it seems to control the disease. I am a great fan of doing it non-stop -and will do it for as long as it works (hopefully the rest of my life)
77 yrs male (73 at Dx)
2/13 Dx Carcinoma, Sigmoid Colon
3/13 Sigmoid Colon Hemicolectomy,( 12"+)
3/13 Pathology Staging: T1N0M0; no follow-up chemo
5/15 Recurrence: in pre-sacral space -no other mets detected (Instantly became Stage IV)
5/15 Started 8 sessions of Folfox + Avastin
11/15 Finished chemo, PET/CT: NED
11/15 Started Xeloda+ Avastin every 3 weeks. Still Doing it.
Still NED -(Hope treatment keeps working)