has material basis in chromosomal duplication syndrome hereditary mixed polyposis syndrome hereditary mixed polyposis syndrome 1 A hereditary mixed polyposis syndrome that has_material_basis_in heterozygous duplication of a region on chromosome 15q15.3-q22.1. DOID:0111685 CRAC1 HMPS1 MIM:601228 chromosome 15q13-q14 duplication syndrome, 40-KB colorectal adenoma and carcinoma 1 disease_ontology chromosome duplication