For example, methylation of FANCF has been reported in 6.7% (4/60) testicular tumours Koul et al (2004), 15% (13/89) head and neck cancers (Marsit et al, 2004) and 30% (30/100) cervical cancers (Narayan et al, 2004). This evidence concerns the gene FANCF and head and neck cancer.