Bray F, Ferlay J, Soerjomataram I, Siegel RL, Torre LA, Jemal A Global cancer statistics 2018: GLOBOCAN estimates of incidence and mortality worldwide for 36 cancers in 185 countries. CA Cancer J Clin. 2018 Nov;68(6):394-424. doi: 10.3322/caac.21492. Epub 2018 Sep 12. Erratum in: CA Cancer J Clin. 2020 Jul;70(4):313.
Chen M, Zhao H Next-generation sequencing in liquid biopsy: cancer screening and early detection. Hum Genomics. 2019 Aug 1;13(1):34. doi: 10.1186/s40246-019-0220-8. Review.
Guo S, Diep D, Plongthongkum N, Fung HL, Zhang K, Zhang K Identification of methylation haplotype blocks aids in deconvolution of heterogeneous tissue samples and tumor tissue-of-origin mapping from plasma DNA. Nat Genet. 2017 Apr;49(4):635-642. doi: 10.1038/ng.3805. Epub 2017 Mar 6.
Haber DA, Velculescu VE Blood-based analyses of cancer: circulating tumor cells and circulating tumor DNA. Cancer Discov. 2014 Jun;4(6):650-61. doi: 10.1158/2159-8290.CD-13-1014. Epub 2014 May 6. Review.
Hu W, Zheng W, Liu Q, Chu H, Chen S, Kim JJ, Wu J, Si J Diagnostic accuracy of DNA methylation in detection of gastric cancer: a meta-analysis. Oncotarget. 2017 Nov 3;8(68):113142-113152. doi: 10.18632/oncotarget.22613. eCollection 2017 Dec 22.
Klutstein M, Nejman D, Greenfield R, Cedar H DNA Methylation in Cancer and Aging. Cancer Res. 2016 Jun 15;76(12):3446-50. doi: 10.1158/0008-5472.CAN-15-3278. Epub 2016 Jun 2. Review.
Li MY, Zhang DQ, Lu X, Chen WC [Comparison of two serological methods in screening gastric cancer and its precancerous condition]. Zhonghua Nei Ke Za Zhi. 2018 Dec 1;57(12):907-911. doi: 10.3760/cma.j.issn.0578-1426.2018.12.006. Chinese.
Liu MC, Oxnard GR, Klein EA, Swanton C, Seiden MV; CCGA Consortium Sensitive and specific multi-cancer detection and localization using methylation signatures in cell-free DNA. Ann Oncol. 2020 Jun;31(6):745-759. doi: 10.1016/j.annonc.2020.02.011. Epub 2020 Mar 30.
Miki K Gastric cancer screening using the serum pepsinogen test method. Gastric Cancer. 2006;9(4):245-53. Epub 2006 Nov 24.
Morgan AE, Davies TJ, Mc Auley MT The role of DNA methylation in ageing and cancer. Proc Nutr Soc. 2018 Nov;77(4):412-422. doi: 10.1017/S0029665118000150. Epub 2018 Apr 30. Review.
Zhang X, Li M, Chen S, Hu J, Guo Q, Liu R, Zheng H, Jin Z, Yuan Y, Xi Y, Hua B Endoscopic Screening in Asian Countries Is Associated With Reduced Gastric Cancer Mortality: A Meta-analysis and Systematic Review. Gastroenterology. 2018 Aug;155(2):347-354.e9. doi: 10.1053/j.gastro.2018.04.026. Epub 2018 Apr 30. Review.
Gastric Cancer Detection by Liquid Biopsy in Peripheral Blood: A Prospective Study
Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
Observational studies are often retrospective and are used to assess potential causation in exposure-outcome relationships and therefore influence preventive methods.
Expanded access is a means by which manufacturers make investigational new drugs available, under certain circumstances, to treat a patient(s) with a serious disease or condition who cannot participate in a controlled clinical trial.
Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.
Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.