CHI3L1 and cervical carcinoma: Under the hypothesis that gene polymorphisms or haplotypes of the CHI3L1 gene have an impact on YKL-40 expression in cervical cancer, this study investigated the distribution of CHI3L1 gene polymorphisms and haplotypes among patients with cervical cancer and pre-cancerous lesions and normal controls to define their roles in cervical carcinogenesis in Taiwanese women.