In line with a previous study on the effect of MBL on gestational age in healthy women [6], an association was found between preterm birth and the maternal high MBL production genotype group A, although in the present study of patients with RA, it did not reach statistical significance (OR, 2.38; 95% CI, 0.47 to 12.1). This evidence concerns the gene MBL2 and rheumatoid arthritis.