Cytochrome P450 Metabolism of Betel Quid-Derived Compounds: Implications for the Development of Prevention Strategies for Oral and Pharyngeal Cancers

Table 1

Detected saliva levels (ng/mL) of nitrosamines such as MNPN, NGL, and NGC in chewers with tobacco and without tobacco.

BQ-specific N-nitrosamines	BQ alone (without tobacco)	BQ + tobacco	References
MNPN	0.5–11.4	—^a	Prokopczyk et al., 1987 [36]
NGL	0–5.9	0–7.1	Nair et al., 1985 [38]
	0.6–8.8	3.1–23.5	Nair et al., 1987 [39]
	2.2–9.5^b	4.3–45^b	Wenke et al., 1984 [40]
	0–142	—	Stich, 1986 [41]
NGC	0–26.6	0–30.4	Nair et al., 1985 [38]

Adapted from [16].
BQ: betel quid.
^aThe data not reported.
^bIn ppb.