To control the possible bias of potentially confusing confounders, a logistic regression model including sex, age, and genotype variables, conforming to the appropriate genetic model of inheritance, showed that the mutated genotypes MCP-1 -2518 (AG + GG), MCP-1 -362 (CC), and MCP-1 int1del554-567 (Ins/Del + Del/Del) were correlated with schizophrenia (P=0.001/adjusted OR = 0.42, P=0.001/adjusted OR = 2.38, and P=0.04/adjusted OR = 0.6, respectively) and the same result was confirmed for the association with the different clinical forms. The gene discussed is CCL2; the disease is schizophrenia.