The 7-oxo acid, 26H,7O-CA, is present in plasma from healthy controls and carriers (1–1.5 ng/mL) but greatly elevated in plasma from NPC (13.5–60.5 ng/mL), NPB (39–60 ng/mL) and LALD (9.5–52 ng/mL) (Fig. 5C). The gene discussed is NPB; the disease is nasopharyngeal carcinoma.