Participate in Research at CU Anschutz

This phase I/II trial studies the best dose and side effects of peposertib and to see how well it works with avelumab and hypofractionated radiation therapy in treating patients with solid tumors and hepatobiliary malignancies that have spread to other places in the body (advanced/metastatic). Peposertib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Immunotherapy with monoclonal antibodies, such as avelumab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. Hypofractionated radiation therapy delivers higher doses of radiation therapy over a shorter period of time and may kill more tumor cells and have fewer side effects. Giving peposertib in combination with avelumab and hypofractionated radiation therapy may work better than other standard chemotherapy, hormonal, targeted, or immunotherapy medicines available in treating patients with solid tumors and hepatobiliary malignancies.

PRIMARY OBJECTIVES: I. To determine the safety and tolerability and recommended phase 2 dose (RP2D) of peposertib (M3814) in combination with hypofractionated radiation and avelumab in patients with advanced/metastatic solid tumors. (Phase I) II. To determine the efficacy of the combination of hypofractionated radiation, M3814, and avelumab as compared to the combination of hypofractionated radiation and avelumab in patients with advanced/metastatic hepatobiliary tumors by objective response rate (ORR) in non-irradiated lesions. (Phase II) SECONDARY OBJECTIVES: I. To observe and record anti-tumor activity. (Phase I) II. To characterize the pharmacokinetic (PK) profile of M3814 in combination with avelumab. (Phase I) III. To determine the efficacy and safety of the combination of hypofractionated radiation, M3814, and avelumab as compared to hypofractionated radiation and avelumab by measurement of disease control rate (DCR), duration of response (DOR), progression free survival (PFS), PFS outside the irradiated field, and overall survival (OS) in patients with advanced/metastatic hepatobiliary tumors. (Phase II) IV. To determine if baseline deoxyribonucleic acid (DNA) repair defects inherent to some cholangiocarcinomas correlate with a more dramatic response to radiation compared to those without as measured by gamma H2AX phosphorylated (p)NBS1 multiplex immunofluorescence (IFA) assay. (Phase II) V. To characterize the pharmacokinetic (PK) profiles of M3814 and avelumab. (Phase II)