This phase III trial compares the effect of selumetinib versus the standard of care treatment with carboplatin and vincristine (CV) in treating patients with newly diagnosed or previously untreated low-grade glioma (LGG) that does not have a genetic abnormality called BRAFV600E mutation and is not associated with systemic neurofibromatosis type 1. Selumetinib works by blocking some of the enzymes needed for cell growth and may kill tumor cells. Carboplatin and vincristine are chemotherapy drugs that work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. The overall goal of this study is to see if selumetinib works just as well as the standard treatment of CV for patients with LGG. Another goal of this study is to compare the effects of selumetinib versus CV in subjects with LGG to find out which is better. Additionally, this trial will also examine if treatment with selumetinib improves the quality of life for subjects who take it.

This phase II trial studies the effects of niraparib in combination with dostarlimab prior to surgery in treating BRCA-mutated or PALB2-mutated stage I-III breast cancer. Niraparib is a PARP inhibitor, which means that it blocks an enzyme (proteins that help chemical reactions in the body occur) in cells called PARP. PARP helps repair deoxyribonucleic acid (DNA) when it becomes damaged. Blocking PARP may help keep cancer cells from repairing their damaged DNA, causing them to die. PARP inhibitors are a type of targeted therapy. Dostarlimab stimulates the immune system by blocking the PD-1 pathway. The PD-1 pathway controls the bodys natural immune response, but for some types of cancer, the immune system does not work as it should and is prevented from attacking tumors. Dostarlimab works by blocking the PD-1 pathway, which may help your immune system identify and catch tumor cells. Giving niraparib in combination with dostarlimab may work better against the tumor and maximize tumor shrinkage before surgery.