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Chronic obstructive pulmonary disease risk and smoking cessation changes induced by CHRNA5-A3 and CHRNB3-A6 variation in a Chinese male population


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The demographic characteristics of the studied subjects. (Results are presented as mean±SD.)

Characteristics Male Smokers Male COPD Patients
COPD Patients (n=256) Healthy Controls (n=435) p Valuea Still Smoking (n=256) Non Smoking (n=410) p Valuea
Age (years) 67.6±11.1 57.1±13.2 <0.001 67.6±11.1 70.7±8.2 <0.001
BMI (years) 21.5±3.5 21.8±3.4 0.13 21.0±2.9 28.8±3.1 0.220
Smoking Cigarettes/variables: day 27.0±15.1 19.7±11.7 <0.001 27.0±15.1 21.2±9.7 <0.001
Years smoking 40.2±9.9 31.4±14.7 <0.001 40.2±9.9 34.9±13.4 <0.001
Post-FEV1 predicted 58.0±5.6 104.7±9.6 <0.001 58.0±5.6 59.1±16.2 0.0352
Post-FEV1/FVC ratio 52.7±8.7 78.5±5.6 <0.001 52.7±8.7 53.9±8.6 0.056
GOLD status:
Stage I (mild) 114 114 133
Stage II (moderate) 120 120 138
Stage III (severe) 98 98 121
Stage IV (very severe) 75 75 24

Association of genotype distribution of three SNPs with smoking cessation in still smoking and non smoking subjects.

SNP ID Genotype Still Smoking Non Smoking Logistics Regression
n (%) n (%) pa2) OR (95% CI)b pa2)
rs3743073 GG 109 (26.8) 92 (22.1) 1 (reference)
GT 190 (46.7) 221 (53.1) 0.063 1.01 (0.66-1.53) 0.975
TT 108 (26.5) 103 (24.8) 0.093 0.73 (0.51-1.05) 0.731
rs667282 TT 118 (29.0) 92 (22.1) 1 (reference)
CT 162 (39.8) 205 (49.3) 0.005 0.54 (0.37-0.77) 0.001
CC 127 (31.2) 119 (28.6) 0.330 0.75 (0.50-1.10) 0.142
CT+CC 289 (71.0) 324 (77.9) 0.024 0.61 (0.44-0.86) 0.004
TT+CC 245 (60.2) 211 (50.7)
CT 162 (39.8) 205 (49.3) 0.006 0.61 (0.45-0.83) 0.001
rs4950 AA 183 (45.0) 143 (34.3) 1 (reference)
AG 164 (40.3) 217 (52.2) 0.001 0.55 (0.40-0.76) <0.001
GG 60 (14.7) 56 (13.5) 0.412 0.85 (0.54-1.32) 0.462
AG+GG 224 (55.0) 273 (65.7) 0.002 0.62 (0.46-0.83) 0.001
AA+GG 243 (59.7) 199 (47.8)
AG 164 (40.3) 217 (52.2) 0.001 0.58 (0.43-0.79) <0.001

Association of genotype distribution of three SNPs with COPD risk in the patients and controls.

SNP ID Genotype COPD Patients Healthy Controls Logistics Regression
n (%) n (%) pa2) OR (95% CI) pa2)
rs3743073 GG 109 (26.8) 106 (24.4) 1 (reference)
GT 190 (46.7) 207 (47.6) 0.502 1.14 (0.69-1.88) 0.615
TT 108 (26.5) 122 (28.0) 0.430 1.24 (0.81-1.91) 0.322
rs667282 TT 118 (29.0) 108 (24.8) 1 (reference)
CT 162 (39.8) 197 (45.3) 0.095 0.77 (0.51-1.15) 0.196
CC 127 (31.2) 130 (29.9) 0.540 0.70 (0.48-1.02) 0.066
rs4950 AA 183 (45.0) 208 (47.8) 1 (reference)
AG 164 (40.3) 181 (41.6) 0.842 1.28 (0.78-2.07) 0.310
GG 60 (14.7) 46 (10.6) 0.073 0.90 (0.65-1.26) 0.549

Association of rs667282 and rs4950 polymorphisms with the GOLD stage of COPD patients.

Category Still Smoking OR (95% CI) p Value Non Smoking OR (95% CI) p Value
rs667292 TT CT TT CT
GOLD status: I and II 71 93 reference 55 126 reference
GOLD status: III and IV 48 70 0.90 (0.57-1.45) 0.661 45 79 1.31 (0.80-2.12) 0.281
rs4950 AA AG AA AG
GOLD status: I and II 102 110 reference 104 136 reference
GOLD status: III and IV 78 82 1.03 (0.68-1.55) 0.903 42 78 0.70 (0.45-0.11) 0.129

Stratification analysis of rs667282 genotypes by selected variables in still smoking and non smoking subjects.

Category Still Smoking Non Smoking
TT CT TT CT OR (9% CI) p Value
Age (years) <60 39 53 22 45 0.66 (0.35-1.28) 0.221
60 80 109 78 160 0.66 (0.45-0.99) 0.042
Cigarettes/Day <20 84 104 77 164 0.58 (0.39-0.86) 0.007
20 35 58 23 41 0.93 (0.48-1.80) 0.829
Initial age smoking <20 years 75 114 66 149 0.67 (0.45-1.02) 0.059
>20 years 44 48 34 56 0.66 (0.37-1.20) 0.171

Stratification analysis of rs4950 genotypes by selected variables in still smoking and non smoking subjects.

Category Still Smoking Non Smoking
AA AG AA AG OR (9% CI) p Value
Age (years) <60 52 76 28 40 1.02 (0.56-1.86) 0.940
>60 128 106 118 174 1.22 (0.86-1.73) 0.260
Cigarettes/Day <20 116 114 106 161 0.65 (0.45-0.92) 0.016
>20 64 68 40 53 0.80 (0.47-1.37) 0.417
Initial age smoking <20 years 113 116 94 133 0.73 (0.50-1.05) 0.089
>20 years 67 66 52 81 0.63 (0.39-1.03) 0.064
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Inglés
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2 veces al año
Temas de la revista:
Medicine, Basic Medical Science, other