Table 1.
The characteristics of studies included in this meta-analysis
| Author | Year | Country | Age (range) | Study period | The categories of BMI | The number of metastatic tumors | The number of non-metastatic tumors | NOS |
|---|---|---|---|---|---|---|---|---|
| Xiaoyao Zhang | 2014 | China | 53 (27-92) | 2010.1-2012.11 | BMI <18.5 (underweight)/ 18.5-22.9 (normal)/ 23-24.9 (overweight)/ 25-29.9 (obese)/ BMI≥30 (severe obese) | 2/27/21/85/25 | 7/56/51/115/35 | 6 |
| Nicoletta Biglia | 2013 | Italy | 45/65 | 1999.1-2009.12 | BMI < 19 (underweight)/ 19-24.9 (normal)/ 25-29.9 (overweight)/ BMI≥30 (obese) | 20/141/49/29 (premenopausal) 20/247/217/97 (postmenopausal) | 37/200/44/20 (premenopausal) 35/372/243/125 (postmenopausal) | 7 |
| Orsolya Hankó-Bauer | 2017 | Romania | 58.29 (27-80) 52.81/60.38/62.8 | 2012-2015 | BMI < 25 (normal weight)/ 25-29.9 (overweight)/ BMI≥30 (obese) | 32/40/40 | 54/48/31 | 6 |
| Ahmad Kaviani | 2013 | Iran | 49.62 (21-88) | 2003-2011 | BMI < 24.9 (normal weight)/ 25<BMI<29.9 (overweight)/ BMI<BMI30 (obese) | 64/77/42 (premenopausal) 45/68/60 (postmenopausal) | 60/52/22 (premenopausal) 39/70/31 (postmenopausal) | 7 |
| O.Keskin | 2013 | Turkey | 48.9±10.7 44.5±11.1/ 49.6±11.1/ 52.7±10.0 | 2001-2011 | 20-24.9 (normal weight)/ 25-29.9 (overweight)/ BMI≥30 (obese) | 231/266/226 | 198/205/169 | 7 |
| Geoffrey A. Porter | 2006 | Canada | 60±15.5 | 2002.2.15- 2004.2.15 | BMI <25 (normal/underweight)/ 25-29.9 (overweight)/ BMI≥30 (obese/severely obese) | 36/33/46 | 130/144/130 | 8 |
| Marianne Ewertz | 2011 | Denmark | --- | 1977-2006 | BMI <25/ 25-29/ 30+ | 6867/3201/1489 | 4621/1937/849 | 7 |
| Vincent C. Herlevic | 2015 | US | 61.3 60.5/61.7/61.3 | 1997-2013 | BMI<25 (normal weight)/ 25-30 (overweight)/ BMI>30 (obese) | 40/71/142 | 47/79/144 | 8 |
| Marian L. Neuhouser | 2016 | US | 50-79 | 1993-1998 | BMI<25 (normal weight)/ 25-30 (overweight)/ 30-35 (obese, Grade 1)/ BMI≥35 (obese, Grade 2+3) | 168/245/184/138 (postmenopausal) | 579/825/547/345 (postmenopausal) | 8 |
| G. Berclaz | 2004 | International Breast Cancer Study Group | 48 (21-84)/ 53 (25-80)/ 55 (26-80) | 1978-1993 | BMI<24.9 (normal weight)/ 25.0-29.9 (intermediate)/ BMI≥30.0 (obese) | 2613/1652/833 | 695/386/191 | 6 |
| Vito Michele Garrisi | 2012 | Italy | --- | 2004-2006 | BMI<24.9 (normal)/ 25-29.99 (overweight)/ BMI≥30 (obese) | 43/63/38 | 63/38/24 | 6 |
| Luca Mazzarella | 2013 | European Institute of Oncology | --- | 1995-2005 | BMI <25 (under/normal weight)/ 25-29.99 (overweight)/ BMI≥30 (obese) | 258/77/28 (ER positive) 149/66/29 (ER negative) | 283/67/31 (ER positive) 159/63/18 (ER negative) | 7 |
| Amelia Smith | 2018 | US | 67 (63,73) | 1993-2009 | BMI < 18.5 (underweight)/ 18.5-24.9 (normal weight)/ 25-29.9 (overweight)/ BMI≥30 (obese) | 3/282/261/197 (postmenopausal) | 19/869/819/561 (postmenopausal) | 6 |
| Kang Wang | 2019 | China | 50.0±11.2 48.5±13.7/ 49.1±11.1/ 52.6±10.7 | 2005.1-2015.12 | BMI<18.5 (underweight)/ 18.5-24.9 (normal weight)/ BMI≥25 (overweight and obese) | 114/1644/537 (premenopausal) 70/1120/627 (postmenopausal) | 100/1316/422 (premenopausal) 107/1184/559 (postmenopausal) | 6 |
| E.R. Copson | 2014 | UK | 36 (18-40) 36 (18-40)/ 37 (18-40)/ 37 (24-40) | 2000-2008 | BMI<25 (under/healthy weight)/ 25-30 (overweight)/ BMI≥30 (obese) | 736/419/284 (premenopausal) | 766/354/236 (premenopausal) | 7 |
| Aruna Kamineni | 2013 | US | 64.5 (40-93) | 1988.1.1- 1993.12.31 | BMI<25 (normal weight)/ 25-30 (overweight)/ BMI≥30 (obese) | 32/27/12 | 174/102/66 | 6 |
| Ronny Mowad | 2013 | US | 49.8 53.2/49.1/49.3 | 1998.3-2011.9 | BMI<25 (normal/underweight)/ 25-29.9 (overweight)/ BMI>30 (obese) | 9/18/47 | 15/24/70 | 8 |
| Foluso O. Ademuyiwa | 2011 | US | 54 (26-92) 52.9/56.3/56.1 | 1996.7-2010.7 | BMI≤24.9 (normal/underweight)/ 25-29.9 (overweight)/ BMI>30 (obese) | 44/49/68 | 80/81/96 | 7 |
| Shaheenah Dawood | 2008 | US | 46 (23-76)/ 48 (23-78)/ 52 (28-78) | 1974-2000 | BMI≤24.9 (normal/underweight)/ 25-29.9 (overweight)/ BMI≥30 (obese) | 186/175/186 | 21/19/16 | 7 |
| Ozan Yazici | 2015 | Turkey | 48 (18-92) | 2002.1-2013.10 | 18.5-24.9 (normal weight)/ 25-29.9 (overweight)/ BMI≥30.0 (obese) | 20/14/7 (premenopausal) 7/5/10 (postmenopausal) | 549/393/226 (premenopausal) 228/419/409 (postmenopausal) | 7 |
BMI Body mass index, NOS Newcastle-Ottawa's Scale