Further laboratory tests revealed an Apolipoprotein-B/Apolipoprotein-A1 ratio of 2.9 (Apolipoprotein-B: 3.5 g/l, Apolipoprotein-A1: 1.4 g/l), which confirmed that the abovementioned lesions were xanthomas. The gene discussed is APOA1; the disease is xanthoma.