RESUMEN
OBJECTIVES: Cancer education has been promoted under the Basic Plan for Cancer Education in Japan. We conducted a repeated cross-sectional survey of Japanese students to determine changes in attitudes regarding cancer over time. METHODS: A nationwide survey of fifth-grade elementary students was conducted in February 2013. A repeated cross-sectional survey was conducted following previous studies with second-year high school students in February 2019, as second-year high school students in 2019 corresponded to the generation of fifth-grade students in 2013. The self-administered, multiple-choice questionnaire inquired about the awareness of cancer and its causes and sources of cancer information. Statistical analyses were performed by calculating the percentage of selections and 95% confidence intervals for each question. RESULTS: The differences between values in 2019 and 2013 were examined. Responses were received from 94 schools (44.1%) in 2013 and 114 schools (52.8%) in 2019. After excluding incomplete responses, valid responses from 2213 and 3822 respondents, respectively, were analyzed. Desirable changes over time were observed in awareness. Increasing age was associated with a rise in misperceptions and a decline in desirable rather than undesirable perceptions of the causes of cancer. The Internet was a common source of information among high school students, followed by health education at school. CONCLUSION: Cancer education in schools should aim to counteract misconceptions and promote positive, evidence-based information. Improving perceptions of cancer screening could increase intentions of undergoing screening. Additionally, presenting cancer information using social networking sites could help promote cancer prevention among junior high and high school students.