An autosomal recessive inherited disorder caused by mutations in the XPC gene. This disease is characterized by increased sensitivity to sunlight with the development of carcinomas at an early age and is caused by a defect in nucleotide excision repair. The disease is MONDO_0010211 (xeroderma pigmentosum group C). Also known as: XP group C, XP-C, XP3, XPC, XPCC, xeroderma pigmentosum III, xeroderma pigmentosum group type C, xeroderma pigmentosum, complementation group type C.