Table 1. Information summary of 51 eligible studies included in this meta-analysis.
| Author [reference] | Country | Year | Cancer type | Ethnicity | No. of case/control | Study type | Control source | DNA source | Measurement methods |
|---|---|---|---|---|---|---|---|---|---|
| Gabriella M. Anic et al._melonoma11 a | USA | 2013 | melanoma | Caucasian | 198/372 | retrospective | hospital-based | leukocyte | quantitative PCR |
| Gabriella M. Anic et al._BCC11 a | USA | 2013 | basal cell carcinoma | Caucasian | 185/372 | retrospective | hospital-based | leukocyte | quantitative PCR |
| Gabriella M. Anic et al._SCC11 a | USA | 2013 | squamous cell carcinoma | Caucasian | 136/372 | retrospective | hospital-based | leukocyte | quantitative PCR |
| Hongmei Nan et al.12 | USA | 2011 | cutaneous melanoma | Caucasian | 557/579 | retrospective | population-based | leukocyte | quantitative PCR |
| Jiali Han et al._melonoma13 | USA | 2009 | melanoma | Caucasian | 204/222 | prospective | population-based | leukocyte | quantitative PCR |
| Jiali Han et al._SCC13 | USA | 2009 | squamous cell carcinoma | Caucasian | 254/273 | prospective | population-based | leukocyte | quantitative PCR |
| Jiali Han et al._BCC13 | USA | 2009 | basal cell carcinoma | Caucasian | 282/306 | prospective | population-based | leukocyte | quantitative PCR |
| Geyu Liang et al._SCC14 | USA | 2011 | squamous cell carcinoma | Caucasian | 241/241 | retrospective | population-based | leukocyte | quantitative PCR |
| Geyu Liang et al._BCC14 | USA | 2011 | basal cell carcinoma | Caucasian | 623/1943 | retrospective | population-based | leukocyte | quantitative PCR |
| Laura S. Burke et al.15 | USA | 2013 | melanoma | Caucasian | 119/208 | retrospective | family-based | whole blood or EBV-transformed lymphocytes | quantitative PCR |
| Xifeng Wu et al._RCC16 | USA | 2003 | renal cell carcinoma | Caucasian | 32/32 | retrospective | population-based | leukocyte | Q-FISH |
| Xifeng Wu et al._BLC16 | USA | 2003 | bladder cancer | Caucasian | 135/135 | retrospective | population-based | leukocyte | Q-FISH |
| Lisa Mirabello et al.17 | USA | 2009 | prostate cancer | Caucasian | 612/1049 | retrospective | population-based | leukocyte | quantitative PCR |
| B Julin et al.18 | USA | 2015 | prostate cancer | Caucasian | 922/935 | retrospective | population-based | leukocyte | quantitative PCR |
| Lauren M. Hurwitz et al.19 | USA | 2014 | prostate cancer | Caucasian | 112/63 | retrospective | family-based | leukocyte | quantitative PCR |
| Jonathan N. Hofmann et al.20 | USA | 2013 | renal cell carcinoma | Caucasian | 209/410 | prospective | population-based | leukocyte | quantitative PCR |
| Jonathan N. Hofmann et al._Caucasian21 | USA | 2011 | renal cell carcinoma | Caucasian | 658/550 | retrospective | population-based | whole blood | quantitative PCR |
| Jonathan N. Hofmann et al._African American21 | USA | 2011 | renal cell carcinoma | African American | 233/344 | retrospective | population-based | whole blood | quantitative PCR |
| Monica McGrath et al.22 | USA | 2007 | bladder cancer | Caucasian | 184/192 | retrospective | population-based | leukocyte | quantitative PCR |
| Karin Broberg et al.23 | Sweden | 2005 | bladder cancer | Caucasian | 63/93 | retrospective | population-based | buccal cell | quantitative PCR |
| Andrew J. Pellatt et al.24 | USA | 2012 | colon rectal cancer | Caucasian | 525/746 | retrospective | population-based | whole blood | quantitative PCR |
| Yong Cui et al.25 | China | 2012 | colorectal cancer | Asian | 512/549 | retrospective | Population-based | leukocyte | quantitative PCR |
| Qin Qin et al.26 | China | 2014 | colorectal cancer | Asian | 628/1256 | retrospective | hospital-based | leukocyte | quantitative PCR |
| Lifang Hou et al.27 | USA | 2009 | gastric cancer | Caucasian | 300/416 | retrospective | population-based | leukocyte | quantitative PCR |
| Rosa Ana Risques et al.28 | USA | 2007 | esophageal adenocarcinoma | Caucasian | 38/300 | prospective | population-based | leukocyte | quantitative PCR |
| Qianqian Yu et al.29 | China | 2014 | esophageal squamous cell carcinoma | Asian | 308/309 | retrospective | hospital-based | lymphocyte | quantitative PCR |
| Jiangbo Du et al.30 | China | 2015 | gastric cancer | Asian | 1136/1102 | retrospective | population-based | leukocyte | quantitative PCR |
| Xiaonan Liu et al.31 | China | 2009 | gastric cancer | Asian | 396/376 | retrospective | hospital-based | leukocyte | quantitative PCR |
| Jinliang Xing et al.32 | USA | 2009 | esophageal cancer | Caucasian | 94/92 | retrospective | hospital-based | leukocyte | quantitative PCR |
| Maria M. Gramatges et al.33 | USA | 2010 | breast cancer | Caucasian | 102/50 | retrospective | population-based | leukocyte | quantitative PCR |
| Andrew J. Pellatt et al.34 | USA | 2013 | breast cancer | Caucasian | 728/720 | retrospective | population-based | leukocyte | quantitative PCR |
| Jing Shen et al.35 | USA | 2009 | breast cancer | Caucasian | 1026/1070 | retrospective | population-based | leukocyte | quantitative PCR |
| Immaculata De Vivo et al.36 | USA | 2009 | breast cancer | Caucasian | 896/917 | prospective | population-based | leukocyte | quantitative PCR |
| Sangmi Kim et al.37 | USA | 2011 | breast cancer | Caucasian | 342/735 | prospective | population-based | leukocyte | quantitative PCR |
| Jing Shen et al.38 | USA | 2007 | breast cancer | Caucasian | 283/347 | retrospective | family-based | leukocyte | quantitative PCR |
| Yun-Ling Zheng et al.39 | USA | 2010 | breast cancer | Caucasian | 292/335 | retrospective | population-based | leukocyte | Q-FISH |
| Shimian Qu et al.40 | USA | 2012 | breast cancer | Asian | 601/695 | prospective | population-based | leukocyte | quantitative PCR |
| Xifeng Wu et al._LC16 | USA | 2003 | lung cancer | Caucasian | 54/54 | retrospective | population-based | leukocyte | Q-FISH |
| Min Shen et al.41 | USA | 2011 | lung cancer | Caucasian | 230/229 | prospective | population-based | leukocyte | quantitative PCR |
| Qing Lan et al.42 | USA | 2013 | lung cancer | Asian | 215/215 | prospective | population-based | leukocyte | quantitative PCR |
| Beatriz Sanchez-Espiridion et al._LAC43 | USA | 2014 | lung adenocarcinoma | Caucasian | 706/706 | retrospective | hospital-based | leukocyte | quantitative PCR |
| Beatriz Sanchez-Espiridion et al._LSCC43 | USA | 2014 | lung squamous cell carcinoma | Caucasian | 320/320 | retrospective | hospital-based | leukocyte | quantitative PCR |
| Wei Jie Seow et al.44 | USA | 2014 | lung cancer | Caucasian | 847/847 | prospective | Population-based | leukocyte | quantitative PCR |
| Bing Sun et al.45 | USA | 2015 | lung cancer | Caucasian | 191/207 | retrospective | Population-based hospital-based | lymphocyte | Q-FISH |
| Jin Sung Jang et al.46 | Korea | 2008 | lung cancer | Asian | 243/243 | retrospective | hospital-based | leukocyte | quantitative PCR |
| Yang Zhang et al._OCC47 a | USA | 2013 | oral cavity cancer | Caucasian | 137/335 | retrospective | hospital-based | lymphocyte | quantitative PCR |
| Yang Zhang et al._OPC47 a | USA | 2013 | oropharyngeal squamous cell carcinoma | Caucasian | 188/335 | retrospective | hospital-based | lymphocyte | quantitative PCR |
| Da-Tian Bau et al.48 | USA | 2013 | oral squamous cell carcinoma | Caucasian | 92/394 | retrospective | hospital-based | leukocyte | quantitative PCR |
| Xifeng Wu et al._HNC16 | USA | 2003 | head and neck cancer | Caucasian | 92/92 | retrospective | population-based | leukocyte | Q-FISH |
| Qing Lan et al.49 | USA | 2009 | non-Hodgkin lymphoma | Caucasian | 107/107 | retrospective | population-based | leukocyte | quantitative PCR |
| Fatemeh Saberi Hosnijeh et al.50 | Iran | 2014 | B-cell lymphoma | Caucasian | 414/414 | retrospective | population-based | leukocyte | quantitative PCR |
| Thomas A. Widmann et al.51 | Germany | 2007 | non-Hodgkin’s lymphoma | Caucasian | 40/40 | retrospective | hospital-based | lymphocyte | Flow-FISH |
| Juan Liu et al.52 | China | 2011 | hepatitis B virus-related hepatocellular carcinoma | Asian | 240/240 | retrospective | hospital-based | leukocyte | quantitative PCR |
| Shannon M. Lynch et al.53 | USA | 2013 | pancreatic cancer | Caucasian | 193/660 | prospective | population-based | leukocyte | quantitative PCR |
| Xiaoying Fu et al.54 | USA | 2012 | hepatocellular carcinoma | Asian | 140/280 | retrospective | hospital-based | circulating cell-free serum DNA | quantitative PCR |
| Daniele Campa et al.55 | Germany | 2014 | myeloma | Caucasian | 140/468 | retrospective | population-based | leukocyte | quantitative PCR |
| Kathryn L. Terry et al.56 | USA | 2012 | ovarian cancer | Caucasian | 911/947 | retrospective | population-based | leukocyte | quantitative PCR |
| Farzana Walcott et al.57 | USA | 2013 | glioma | Caucasian | 101/198 | prospective | population-based | blood, buffy coat, or buccal cells | quantitative PCR |
| Jennifer Prescott et al.58 | USA | 2010 | endometrial cancer | Caucasian | 279/791 | prospective | population-based | leukocyte | quantitative PCR |
| Maren Weischer et al.59 | Denmark | 2013 | mixed | Caucasian | 3142/41169 | prospective | Population-based | leukocyte | quantitative PCR |
| Lisa Mirabello et al.60 | USA | 2009 | ovarian cancer | Caucasian | 99/100 | retrospective | population-based | leukocyte | quantitative PCR |
| Peter Willeit et al.61 | Italy | 2010 | mixed | Caucasian | 92/695 | prospective | population-based | leukocyte | quantitative PCR |
aThe controls were shared for different cancer types in the same publication.