Among the 77 patients with benign ovarian lesions, only one patient with benign serous adenoma, who had a complication of chronic renal dysfunction (serum creatinine: 2.2 mg/dl), showed a positive result for TFPI2, but all patients with endometriosis (n = 21) were below the cutoff level (Fig. 1c and Supplementary Table 2). This evidence concerns the gene TFPI2 and endometriosis.