Gastric Mucosa-Associated Lymphoid Tissue Lymphoma

This phase II trial tests the effect of nemtabrutinib in combination with rituximab in treating patients with marginal zone lymphoma. Nemtabrutinib, a non-covalent Bruton's tyrosine kinase (BTK) inhibitor, may stop the growth of cancer cells by blocking some of the enzymes needed for cell growth. Rituximab is a monoclonal antibody. It binds to a protein called CD20, which is found on B cells (a type of white blood cell) and some types of cancer cells. This may help the immune system kill cancer cells. Giving nemtabrutinib in combination with rituximab may be safe, tolerable and/or effective in treating patients with marginal zone lymphoma.