CTLA4 and cervical cancer: To the best of our knowledge, this is the first study that associates the alleles, genotypes, and haplotypes of the CTLA4 genetic variants rs5742909 (−318 C>T), rs231775 (+49 A>G), and rs3087243 (+6230 G>A) to HPV infection, the development of cervical lesions, and cervical cancer in Brazilian women.