A 17-year-old female Korean patient (XP115KO) was previously diagnosed with Xeroderma pigmentosum group C (XPC) by Direct Sanger sequencing, which revealed a homozygous nonsense mutation in the <i>XPC</i> gene (rs121965088: c.1735C > T, p.Arg579Ter). The gene discussed is XPC; the disease is xeroderma pigmentosum.