Figure 1

A: age distribution of the 136 patients with NPC whose DNA was a sufficient quality to yields informative typing results. Age is shown in 5 years brackets to underline the bi-modal distribution of NPC prevalence in Tunisian reflected by the population studied. B: Age distribution of patients with NPC (black bars) and normal TU controls (white bars) separated according to recognized brackets of prevalence: precocious NPC (10 to 25 years), middle age NPC (26 to 50) and late onset NPC (> 50 years of age) (lower panel). C: age distribution of patients with NPC and normal TU controls according to age and gender.