While there is a consensus that both adjuvant ChT and RT benefit patients with respect to locoregional and distant control, the sequencing of these therapies varies between institutions. Common approaches include sequential treatment, with 4-6 cycles of ChT followed by RT, sandwich therapy with RT sandwiched between 3 cycles of ChT, or concurrent CRT. Small retrospective studies have shown a benefit with respect to PFS and OS in the sandwich approach, however this has not been replicated in larger studies.~In more recent years, proton beam therapy (PBT) has become an increasingly common modality for the treatment of uterine malignancies and is capable of even more precise dose distributions than photon-based RT due to intrinsic properties of these much heavier particles. Dosimetric/planning studies from other institutions confirm the significant reduction of dose to critical normal tissues like bladder, bowel, rectum, and bone marrow.~Preliminary data from the University of Maryland Medical Center has suggested that IMPT using pencil beam scanning is feasible in patients with endometrial cancer, with only 10% of patients developing grade 2 GI toxicity and no patients developing ≥ grade 3 GI or GU toxicities (abstract under review).~The investigators would like to test the hypothesis that in the postoperative setting, patients with advanced endometrial cancer will be able to complete a course of full dose ChT - carboplatin and paclitaxel - concurrent with upfront pelvic IMPT.
A phase 2 study with the primary objective of testing treatment compliance of Upfront Intensity Modulated Proton Beam Therapy (IMPT) and Concurrent Chemotherapy (UPPROACH) for Post-operative Treatment in Loco-regionally Advanced Endometrial Cancer is non-inferior to the historic compliance rate of the chemoradiation arm of GOG 258 study