Trends in the incidence rates of tonsil and base of tongue cancer in England, 1985-2006

INTRODUCTION T he aim of this study was to investigate whether incidence rates of tonsil and base of tongue cancer in England are increasing using data form the UK cancer registry. SUBJECTS AND METHODS Cancer registrations for oral cavity and oropharynx cancer from 1985-2006 in England were Obtained from the National Cancer Information Service. Population estimates were obtained from the Office for National Statistics. Age adjusted incidence rates and age-specific incidence rates were calculated. The sexes were considered separately as incidence rates are known to differ significantly between men and women. Linear regression was performed to establish whether there was a relationship between incidence rates and time. RESULTS There has been an increase in all oral cavity and oropharyngeal cancer in the study period. Linear regression analysis suggests that approximately 90% of the variance in age-adjusted incidence rates for men and women for tonsil, based of tongue and other oral cavity cancer is explained by the passage of time. For other oropharyngeal cancer, the variance is 62% and 46% in men and women, respectively. The estimated annual percentage change from 1985 to 2006 in age-adjusted incidence rates for tonsil and base of tongue cancer is 5.7% and 6.7% for men, and 4.3% and 6.5% for women, respectively. CONCLUSIONS This study confirms a wide spread clinical impression that there has been an increase in age-adjusted incidence rates, between 1985 and 2006, in all oral cavity cancer in England. The age range 40-69 years has seen the biggest increases in age specific incidence rates for tonsil and base of tongue cancer. This reflects the findings of similar studies in other countries,