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Table 4 Univariate analysis with positive conversion of HER2 in recurrence for smoking

From: The effect of smoking on biological change of recurrent breast cancer

SmokingChange of HER2 in recurrenceOdd ratio95% CIp value
No change/positive conversion
No-smoker34 (94.4%)/2 (5.6%)ReferenceReference 
Pack-years of smoker
 ≤ 253 (75.0%)/1 (25.0%)5.6670.390–82.2370.243
 25–506 (75.0%)/2 (25.0%)5.6670.664–48.3330.124
 > 501 (50.0%)/1 (50.0%)17.0000.753–383.8920.096
 Smoker10 (71.4%)/4 (28.6%)6.8001.082–42.7310.024
  1. HER2 human epidermal growth factor receptor 2, CI confidence intervals