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Using national population-based cancer registry data from 2016–2019, monthly diagnosis counts were analyzed by sex, age, residential area, cancer site, and clinical stage with Joinpoint regression. Results show a significant increase in oral cancer diagnoses after disclosure, while other head and neck cancers did not change 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public disclosure event was studied in relation to oral cancer diagnoses?","Question",{"text":63,"@type":64},"The study examined the February 19, 2019 disclosure by Japanese singer Chiemi Hori of stage IV tongue cancer.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"How were oral cancer diagnosis trends analyzed?",{"text":68,"@type":64},"National population-based cancer registry data were used to plot monthly changes from 2016 to 2019, stratified by sex, age, residential area, cancer site, and clinical stage, and analyzed with Joinpoint regression.",{"name":70,"@type":61,"acceptedAnswer":71},"What was the main finding after the celebrity’s disclosure?",{"text":72,"@type":64},"Oral cancer diagnoses increased significantly after the disclosure, rising from 784 in January 2019 to 1195 in March 2019, while other head and neck cancers showed no significant 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Trends in Oral Cancer Diagnoses  \nShihoko Koyama1,2  | Takahiro Tabuchi1,3 | Kayo Nakata1 | Toshitaka Morishima1 | Shuji Uchida4,5 | Miki Ishibashi6 | Isao Miyashiro1  \n1Cancer Control Center, Osaka International Cancer Institute, Osaka, Japan | 2Department of Promoting Cooperation for Community Medicine, School of Medical Sciences, Nagoya City University, Nagoya, Aichi, Japan | 3Division of Epidemiology, School of Public Health, Tohoku University Graduate School of Medicine, Sendai, Japan | 4Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University, Osaka, Japan | 5Dental and Oral Surgery, Izumi City General Hospital, Osaka, Japan | 6Department of Cancer Oral Care, Dentistry and Oral maxillofacial Surgery, Osaka International Cancer Institute, Osaka, Japan  \nCorrespondence: Shihoko Koyama ([shihoko167362@gmail.com](shihoko167362@gmail.com))  \nReceived: 9 September 2024 | Revised: 9 April 2025 | Accepted: 21 April 2025  \nFunding: This study was supported by JSPS (Japan Society for the Promotion of Science) KAKENHI Grant Number (JP22K17280, 19H03861), and Osaka Cancer Society. The funders had no role in the study design, data collection, and analysis. The views and opinions expressed in this article are those of the authors and do not necessarily reflect the official policy or position of the respective funding organizations.  \nKeywords: celebrity | epidemiology | Japan | oral cancer | the national population-based cancer registry  \nABSTRACT  \nObjective: On February 19, 2019, Chiemi Hori, a renowned Japanese singer, publicly announced her diagnosis of stage IV tongue cancer. The news was widely reported by the Japanese media. This study examined the association between the celebrity's tongue cancer disclosure and trends in the number of oral cancer diagnoses in the national population-based cancer registry (NCR) in Japan.  \nMethods: Data from the NCR were used to plot monthly changes in the number of oral cancer diagnoses from 2016 to 2019 according to sex, age, residential area (divided into five categories based on the density of dentists), cancer site, and clinical stage at initial treatment. Time trends were analyzed using Joinpoint regression.  \nResults: Between 2016 and 2019, 39,415 oral cancer cases were registered. After Ms. Hori's disclosure, oral cancer diagnoses increased significantly, while other head and neck cancers showed no significant changes. The number of oral cancer diagnoses increased from 784 in January 2019 to 1195 in March 2019 (an average monthly change rate of 8.6% from December 2018 to March 2019) .  \nConclusions: There has been a sharp increase in the number of oral cancer diagnoses since the celebrity's disclosure. This suggests that it has raised public awareness of oral cancer.  \n1 | Introduction  \nOn February 19, 2019, a famous Japanese singer, Chiemi Hori, announced on her blog that she had been diagnosed with stage IV oral cancer (squamous cell carcinoma of the left tongue) and that she had been admitted to hospital for surgery (Hori 2019) .  \nIn the blog, she revealed that she had been visiting a dental clinic for the treatment of stomatitis since the previous summer but with no significant improvement; she finally visited a university hospital and was diagnosed with oral cancer (specifically tongue cancer) . The news was widely reported by the Japanese media (The Asahi Shinbun 2019) .  \n\n| Abbreviations: 95% CI, 95% confidence interval; AMPC, average monthly percent change; MPC, monthly percent change. |\n| --- |\n| This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.\u003Cbr>© 2025 The Author(s). Oral Diseases published by John Wiley & Sons Ltd. |\n\n2878 Oral Diseases, 2025; 31:2878–2884  \n[https://doi.","cbCaifeoeZ5t7nNH","https://ap.wps.com/l/cbCaifeoeZ5t7nNH","pdf",867670,"English","# Introduction\n## Materials and Methods\n### Data","[{\"question\":\"What public disclosure event was studied in relation to oral cancer diagnoses?\",\"answer\":\"The study examined the February 19, 2019 disclosure by Japanese singer Chiemi Hori of stage IV tongue cancer.\"},{\"question\":\"How were oral cancer diagnosis trends analyzed?\",\"answer\":\"National population-based cancer registry data were used to plot monthly changes from 2016 to 2019, stratified by sex, age, residential area, cancer site, and clinical stage, and analyzed with Joinpoint regression.\"},{\"question\":\"What was the main finding after the celebrity’s disclosure?\",\"answer\":\"Oral cancer diagnoses increased significantly after the disclosure, rising from 784 in January 2019 to 1195 in March 2019, while other head and neck cancers showed no significant changes.\"}]","Effects of Public Disclosure of a Japanese Celebrity's Oral Cancer - Trends in Oral Cancer Diagnoses | PDF",1790195471,18]