The study from Thomas Jefferson University Hospital in Philadelphia was presented by Dr. Nitin Ohri, radiation oncology resident, who analyzed the PET scans of 43 patients. Fifteen of the 43 patients had significant activity on the scans both before and after treatment.
Ohri created a coordinate system that divided tumors into nine regions, or 17 regions for larger tumors. He then correlated the activity in the regions both before and after treatment.
Ohri found that in some patients, the activity pattern was in similar regions before and after treatment. However, there were some patients who showed activity in completely different areas after treatment compared to before treatment.
He said that it is not sufficient to increase the dose to areas that are especially active on PET imaging before treatment and expect it to improve the control rate, adding that it may be more appropriate to do a scan halfway through treatment and plan additional radiation dose around that scan.
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