Study	Reason for exclusion
Bonneterre 1996	Non‐extractable
Ellmen 2003	Duplicate of Hayes 1995
Garin 1989	Duplicate of Gershanovich 1997
Gershanovich 1997b	Pooled analysis of  two randomised, three‐arm clinical trials, of which the original data were not available; probably duplicate of Gershanovich 1997 and Hayes 1995 included in the present meta‐analysis
Gershanovich 1997c	Duplicate of Gershanovich 1997
Gianni 2006	Overlaps with Holli 2000b; early stage breast cancer
Gianni 2009	Overlaps with Pagani 2004; non‐extractable
Herrstedt 1989	Duplicate of Stenbygaard 1993
Holli 1998a	Duplicate of Holli 2000b; early stage breast cancer
Holli 1998b	Non‐metastatic breast cancer
Holli 2000a	Duplicates with Holli 2000b; early stage breast cancer
Holli 2000b	Early stage breast cancer
Holli 2002	Duplicate of Holli 2000b early stage breast cancer
Konstantinova 1990	Non‐extractable
Lewis 2010	Early stage breast cancer
Pagani 2003	Duplicate of Pagani 2004; early stage breast cancer
Pagani 2004	Early stage breast cancer
Pyrhonen 1990	Duplicates with Pyrhonen 1997
Simoncini 1996	Non‐extractable
Stenbygaard 1990	Duplicate of Stenbygaard 1993