Skip to main content

Table 4 Five-year disease free survival, breast cancer specific survival and overall survival

From: The association between smoking and breast cancer characteristics and outcome

Population (num)a DFS BCSS OS
5-y DFS HR 95% CI p 5-y BCSS HR 95% CI p 5-y OS HR 95% CI p
All (662) 95.7% - - 95.8% - - 98.5% - -
Hx smokingb
 Yes (173) 96.4% 0.73 0.456 99.2% 0.53 0.404 98.8% 0.80 0.74
 No (439) 95.1% (0.32–1.68)   98.4% (0.12–2.38)   98.6% (0.22–2.92)  
Current Smokeringb
 Yes (101) 98.2% 0.36 0.155 NA NA NA NA NA NA
 No (508) 95.1% (0.09–1.48)        
Number of pack years (PY)
 PY2 0–29 (518) 95.2% 0.85 0.794 98.5% 0.73   98.6% 1.50 0.596
 PY > =30 (66) 96.1% (0.26–2.80)   99.1% (0.09–5.70) 0.764 98.5% (0.33–6.78)  
  1. aSample size: DFS: Smoking history n = 599, smoking status n = 596, pack years n = 575, BCSS: Smoking history n = 607, smoking status n = 604, pack years n = 580, OS: Smoking history n = 610, smoking status n = 607, pack years n = 582
  2. bData regarding smoking was retrieved during the first visit at the oncologist clinic. Current smokers were defined as patients who actively smoked at the time of breast cancer diagnosis. Patients with history of smoking were defined as ever smoker
  3. - Abbreviations: BCSS breast cancer specific survival, DFS disease free survival, NA not applicable, OS overall survival
  4. - Cohort included patients with ER positive, HER2 negative disease