Skip to main content
. 2019 Jun 25;22(6):910–918. doi: 10.1093/ntr/ntz105

Table 2.

Frequencies of Predicted Phenotypes of all Phased CYP2A6 Diplotypes Found in SCF Subgroups (n = 269)

Southwestern Northern Western Southeastern Interior Lower 48 SCF Phenotype class
n = 40 n = 52 n = 58 n = 33 n = 56 n = 30 n = 269
*1/*1 10.0 3.8 13.8 0.0 12.5 3.3 8.2 Normal
*1/*14 12.5 0.0 0.0 3.0 0.0 0.0 2.2 Normal
*1/*1B 32.5 32.7 24.1 39.4 28.6 40.0 31.6 Normal
*1B/*1B 20.0 25.0 24.1 45.5 19.6 13.3 24.2 Normal
*1B/*1B+*14 0.0 1.9 0.0 0.0 0.0 0.0 0.4 Normal
*1/*21 0.0 1.9 0.0 0.0 1.8 6.7 1.5 Normal
*1/*9 10.0 9.6 6.9 6.1 26.8 30.0 14.5 Intermediate
*1/*12 0.0 1.9 5.2 3.0 0.0 0.0 1.9 Intermediate
*1/*28 0.0 1.9 0.0 0.0 0.0 0.0 0.4 Intermediate
*1/*35 2.5 1.9 0.0 0.0 0.0 0.0 0.7 Intermediate
*1B/*1B+*10 0.0 3.8 0.0 0.0 3.6 0.0 1.5 Intermediate
*1B/*1B+*35 0.0 1.9 0.0 0.0 0.0 0.0 0.4 Intermediate
*14/*18 2.5 0.0 0.0 0.0 0.0 0.0 0.4 Intermediate
*1/*2 0.0 1.9 0.0 0.0 3.6 0.0 1.1 Slow
*1/*4 2.5 3.8 6.9 0.0 0.0 0.0 2.6 Slow
*1B/*4 0.0 3.8 5.2 0.0 0.0 0.0 1.9 Slow
*1B+*2/*1B+*9 0.0 0.0 1.7 0.0 0.0 0.0 0.4 Slow
*2/*9 2.5 0.0 0.0 0.0 0.0 0.0 0.4 Slow
*4/*9 0.0 0.0 3.4 0.0 0.0 0.0 0.7 Slow
*4/*14 0.0 0.0 0.0 0.0 1.8 0.0 0.4 Slow
*10/*9+*18 2.5 0.0 0.0 0.0 0.0 0.0 0.4 Slow
*4/*1B+*5 2.5 0.0 1.7 0.0 0.0 0.0 0.7 Poor
*4/*4 0.0 0.0 3.4 0.0 0.0 0.0 0.7 Poor
*4/*5 0.0 0.0 3.4 0.0 0.0 0.0 0.7 Poor
*4/*5+*9 0.0 1.9 0.0 0.0 0.0 0.0 0.4 Poor
*1x2A 0.0 1.9 0.0 3.0 0.0 0.0 0.7 Rapid
*9/*1x2A 0.0 0.0 0.0 0.0 1.8 0.0 0.4 Normal
*1/*1+*S1 0.0 0.0 0.0 0.0 0.0 3.3 0.4 Unknown
*9/*1+*S1 0.0 0.0 0.0 0.0 0.0 3.3 0.4 Unknown

We obtained activity data for CYP2A6 from the old CYP nomenclature website (now PharmVar; https://www.pharmvar.org), where none = 0, decreased = 0.5, and normal = 1. To convert from activity score to phenotype class (or metabolizer phenotype), we used this criteria: Poor (activity score = 0), Slow (activity score 0 to <1), Intermediate (activity score 1 to <2), Normal (activity score 2 to <3), and Rapid (activity score > 3).