This meta-analysis included 6 available studies that evaluated the role of MCP-1 gene in presence and progression of DR.
The G allele and GG genotype of MCP-1 gene increase the susceptible to DR under the homozygous, heterozygous, dominant, recessive, and allelic models.
The GA genotype of MCP-1 gene was significantly associated with increasing risk of PDR under the heterozygous model.