Accordingly, the CFTR-mutation spectrum among 63 infertile Taiwanese men with CBAVD is narrow, with a polythymidine (Tn) variant in intron 8 (IVS8-5T) accounting for 91.3% (42/46) of the variants observed, although most of the identified variants (27/63, 42.9%) were indeterminate [9]. This evidence concerns the gene CFTR and congenital bilateral aplasia of vas deferens from CFTR mutation.