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Table 4 Studies included in the meta‒analysis of the association between smoking status and breast cancer‒specific mortality

From: Smoking at time of diagnosis and breast cancer-specific survival: new findings and systematic review with meta-analysis

  Country Years of follow-up Stage No. participants Breast cancer deaths
Study Current Never Current Never
smokers smokers smokers smokers
Tominaga et al. [15] Japan 1986 to 1995 I to IV 68 325 - -
Manjer et al. [12] Sweden 1977 to 1996 0 to IV 216 491 48 81
Fentiman et al. [11] UK 1984 to 2004 I to II 40 67 - -
Sagiv et al. [16] USA 1996 to 2002 Invasive 252 568 28 52
Holmes et al. [9] USA 1978 to 2002 I to III 1,018 2,112 216 357
Dal Maso et al. [8] Italy 1991 to 2006 I to IV 290 934 80 248
Hellmann et al. [6] Denmark 1976 to 2007 Loc/reg/met 212 120 96 48
Braithwaite et al. [5] USA 1997 to 2012 I to III 173 1194 25 111
Warren et al. [4] USA 1982 to 2010 Loc/reg/met 143 480 - -
Bérubé et al. Canada 1987 to 2008 Loc/reg/met 1,079 3,510 185 583
  1. Loc/reg/met, Local, regional and metastatic disease.