SCN4A and cervical cancer: By using RT-PCR and specific primers they looked for the expression of the TTX-sensitive NaV1.2, NaV1.4, NaV1.6, and NaV1.7 channels which were all amplified in cervical cancers while only mRNA for NaV1.4 were identified in normal cervix tissues (Diaz et al., 2007).