Radiation Therapy (RT) and Chemotherapy for the Treatment of Pancreatic Cancer with Homologous Recombination Deficiency That Has Spread to the Liver

The researchers are doing this study to test the combination of radiation therapy (RT) and low dose chemotherapy in people with metastatic pancreatic cancer that has a homologous recombination deficiency (HRD) and has spread to the liver. The researchers will try to find the highest safe and effective dose of individualized dose-painted RT that can be given to the liver when combined with standard low dose chemotherapy. The conformal dose painted RT treatment plan will include higher doses of radiation to the areas of the liver where tumors can be seen, and a lower dose to the entire liver. The study will also look at blood samples from participants to learn why some people may respond to study treatment (whole liver RT in combination with low dose chemotherapy) better than others.