NPB and nasopharyngeal carcinoma: These trends were not observed for initial members of the neutral pathway of bile acid biosynthesis i.e. 7α-hydroxycholesterol (7α-HC, NPB, 10–12.5 ng/mL; NPC, 12–35 ng/mL; LALD, 2.5–3 ng/mL; control/carrier, 1.5–13.5 ng/mL), the 24-hydroxylase pathway i.e. 24S-hydroxycholesterol (24S-HC, NPB, 9–34.5 ng/mL; NPC, 11.5–15.5 ng/mL; LALD, 28.5–34.5 ng/mL; control/carriers, 7–13.5 ng/mL) or the 25-hydroxylase pathway i.e. 25-hydroxycholesterol (25-HC, NPB, 1.5–2 ng/mL; NPC, 1–1.5 ng/mL; LALD <1 ng/mL, control/carriers, 0.5–1 ng/mL).