Considering its potential key role in the development of endometriosis, in the present study, the subjects with suspected endometriosis were subdivided using an arbitrary cut-off value for plasma VDBP into two groups: one with low (<1000 μg/mL) plasma levels and one with high (>1000 μg/mL) plasma levels of VDBP. This evidence concerns the gene GC and endometriosis.