Abstract
The purpose of this study was to evaluate the response of biliary tract cancer treated with multidrug chemotherapy using FDG PET in comparison with morphologic and density changes. In this phase II clinical trial, 28 patients with unresectable or metastatic biliary tract cancers treated with gemcitabine and oxaliplatin combined with bevacizumab (GEMOX-B) underwent FDG PET and contrast-enhanced CT at baseline and after the second cycle of the therapy (8 weeks). A single reviewer recorded tumor maximum standardized uptake value (SUVmax) along with size, volume (3D-sphere), and density. The percentage changes of the parameters were compared with progression-free survival at 7 months. Overall survival was compared with the percentage change of SUVmax. After 8 weeks, measurable reductions (±SD) in size (7.05±4.19 to 5.52±3.28 cm, -21.70%), volume (411.38±540.08 to 212.41±293.45 cm3, -48.36%), and density (60.76±20.65 to 50.68±16.89 HU, -15.59%) were noted along with a substantial drop in SUVmax (5.95±1.95 to 3.36±1.28, -43.52%). The SUVmax change showed positive correlations with tumor size change (R2=0.39, p=0.0004) and volumetric change (R2=0.34, p=0.001). Patients who showed a larger drop in SUVmax at 8 weeks correlated with favo...Continue Reading
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