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0. The TiO2-RGO-CoO photocatalyst retained its high removal efficiency even after five photocatalytic cycles. Head and neck cancer patients have a higher risk of second primary tumours than the general population. The most frequent locations are head and neck, lung and oesophagus, decreasing long-term survival. The aim of this work was to analyse the incidence, location according to index tumour and stage, chronology, patient age, and survival after diagnosis. Retrospective study on 579 patients with head and neck squamous cell carcinom