NPB and nasopharyngeal carcinoma: Evidence for the presence of 3β,5α,6β-triHCa in plasma samples from patients with NPC (6–16 ng/mL), NPB (31.5–47.5 ng/mL) and LALD (2–21 ng/mL) was again provided by LC retention time, exact mass and MS3 spectra (see Figure 6D in Ref.