Incidence of second primary cancers in oral and pharyngeal cancer patients using a large medical claims database in Japan.

Background/purpose: As the occurrence of second primary cancers (SPCs) is strongly related to the survival rate of patients with oral and pharyngeal cancers, early detection and treatment are important. Therefore, this study aimed to clarify the incidence of SPCs and their risk factors in patients with oral and pharyngeal cancer.

Materials And Methods: This observational study was conducted using data from the administrative claims database of 21,736 participants with oral and pharyngeal cancer from January 2005 to December 2020.

Association between smoking habits and dental care utilization and cost using administrative claims database and specific medical check-up data.

Background: This study aims to evaluate the association between smoking habits and dental care utilization and cost in individuals registered with the Japan Health Insurance Association, Osaka branch.

Methods: We used the administrative claims database and specific medical check-up data and included 226,359 participants, who visited dental institutions, underwent dental examinations, and underwent specific medical checkups, with smoking data from April 2016 to March 2017. We calculated propensity scores with age, gender, exercise, eating habits, alcohol intake, and sleep.