Variables with p < 0.3 from the univariate analysis results (histology (p = 0.256), diabetes (p = 0.037), PCOS (p = 0.186), maintenance therapy (p = 0.163), number of COS cycles per patient (p = 0.072), letrozole+GnRH antagonist/agonist protocol (p = 0.077), total Gn use (p = 0.141), and with a live birth (p = 0.044)) were further incorporated into a Cox multivariate regression model. This evidence concerns the gene GNRH1 and diabetes mellitus.