The susceptibility of secreted frizzled-related protein 2 (SFRP2) methylation in colorectal cancer (CRC) has been studied previously. The aim of this study was to determine the risk sizes and variation trends of SFRP2 methylation in CRC development in Chinese populations. Subgroup meta-analysis and the least-squares curve-fitting method were carried out to analyze the risk of SFRP2 methylation in tissue, feces, and blood detection from 2221 samples, including a total of 1103 cases of CRC, 459 cases of adenoma, 257 cases of polyps, and 402 controls. The data showed that odds ratios (95% confidence intervals) between CRC and controls for tissue, feces, and blood detection were 334.01 (104.42-1068.39), 63.76 (20.62-197.63), and 133.75 (18.32-976.32), respectively. There were also significant differences between tissue and feces or blood as well as between feces and blood methylation frequency. These results showed that the risk size in tissue was much greater than that in feces and that in blood. The results pointed out that three curves in tissue, feces, and blood detection described the variation trends of methylation incidence from the control to polyp, to adenoma and to CRC, and that the variation trend of the risk size of SFRP2 methylation was synchronized with the histological evolution process of CRC. The variation trend of the risk size of SFRP2 methylation incidence is consistent with the histological evolution process of CRC. The susceptibility to SFRP2 methylation is an important biomarker in the study of early diagnosis of CRC and high-risk patients.
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