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). The gene discussed is SCN4A; the disease is cervical carcinoma.