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Kojo K, Kawai K, Kawahara T, Kimura T, Kandori S, Nagumo Y, Nitta S, Kojima T, Okuyama A, Higashi T, Nishiyama H. Recent malignant testicular tumor trend in Japan, a country with an aging population: a large-scale study of 2012-2015 hospital-based cancer registry data. Jpn J Clin Oncol 2020; 50:1201-1208. [PMID: 32627833 DOI: 10.1093/jjco/hyaa110] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Accepted: 06/05/2020] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVE Japan's national database of hospital-based cancer registries is estimated to cover ~67% of all new cancer cases. Using this database, we analyzed the characteristics of the recently diagnosed testicular malignancy. METHODS We obtained data for 6510 adult testicular malignancy patients diagnosed in 2012-2015. The distributions of patient ages, histological diagnoses and testicular germ cell tumor hospital care volumes were determined. RESULTS The most common histology was seminoma (60.3% of all testicular malignancies), followed by non-seminoma (24.1%) and diffuse large B-cell lymphoma (13.1%). The median and mean ages of the testicular germ cell tumor patients were high at 38 and 39.8 years, respectively. The age distribution peaked at 30-40 years, followed by 40-50 years. Approximately 18% of testicular germ cell tumor patients were ≥50 years. The ages of the diffuse large B-cell lymphoma patients peaked at 70-80 years (mean 67.7 years). When the analysis was limited to the testicular germ cell tumor patients who received first-course cancer treatment at the participating hospitals, the number of high-volume hospitals with ≥20 testicular germ cell tumor care volume was limited to 61 (10.0% of the 605 hospitals that treated ≥1 testicular germ cell tumor patient). However, when the patients who changed hospitals during treatment or relapsed after treatment completion were analyzed together, the number of high-volume hospitals increased to 104 (17.0% of 612 hospitals). CONCLUSION The testicular germ cell tumor patients' mean age was nearly 40 years. The proportions of older testicular germ cell tumor patients and diffuse large B-cell lymphoma patients were higher than previously thought. The reasons for this trend are unknown, but it is important to address the trend identified herein in a country with a super-aging population.
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Affiliation(s)
- Kosuke Kojo
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Koji Kawai
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan.,Department of Urology, International University of Health and Welfare Narita Hospital, Narita, Japan
| | - Takashi Kawahara
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Tomokazu Kimura
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Shuya Kandori
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Yoshiyuki Nagumo
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Satoshi Nitta
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Takahiro Kojima
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Ayako Okuyama
- Center for Cancer Control and Information Services, National Cancer Center Japan, Tokyo, Japan
| | - Takahiro Higashi
- Center for Cancer Control and Information Services, National Cancer Center Japan, Tokyo, Japan
| | - Hiroyuki Nishiyama
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
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