ArticleBMC cancer2022
Impact of coronavirus disease 2019 on the number of newly diagnosed cancer patients and examinations and surgeries performed for cancer in Japan: a nationwide study.
Article in BMC cancer, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.
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Who cites it
13 citing papers in PubMed, 18 citations in OpenAlex.
- Impact of the COVID-19 Pandemic on Lung Cancer Screening and Diagnosis: A Systematic Review.Cancers · 2026Review
- Diagnostic Delay and Mortality Risk in Gastric Cancer During the COVID-19 Pandemic: A Retrospective Tertiary-Center Study.Diagnostics (Basel, Switzerland) · 2025Article
- Regional disparities in breast cancer healthcare in Japan: REAL-BC study.Breast cancer (Tokyo, Japan) · 2025Article
- How Musculoskeletal Tumor Management Changed During the COVID-19 Pandemic: Data from a Nationwide Questionnaire Survey of Hospitals Specializing in Musculoskeletal Tumors in Japan.Current oncology (Toronto, Ont.) · 2025Article
- Impact of the COVID-19 Pandemic on Gut Cancer Admissions and Management: A Comparative Study of Two Pandemic Years to a Similar Pre-Pandemic Period.Healthcare (Basel, Switzerland) · 2025Article
- Impact of the coronavirus disease 2019 pandemic on the number of colorectal cancer surgeries performed: analysis of a nationwide inpatient database in Japan.Surgery today · 2025Article
- IMPACT OF COVID-19 PANDEMIC ON THE SURGICAL TREATMENT OF GASTRIC CANCER: A 3-YEAR ANALYSIS.Arquivos brasileiros de cirurgia digestiva : ABCD = Brazilian archives of digestive surgery · 2025Article
- Effect of the COVID-19 Pandemic on the Management of Breast Cancer Patients.Journal of clinical medicine · 2024Article
- The impact of the COVID-19 pandemic on symptomatic breast cancer presentations in an Irish breast cancer unit: a retrospective cohort study.Irish journal of medical science · 2024Article
- The impact of COVID-19 on the diagnosis and treatment of HCC: analysis of a nationwide registry for advanced liver diseases (REAL).Scientific reports · 2024Article
- Impact of COVID-19 on gynecological cancer incidence: a large cohort study in Japan.International journal of clinical oncology · 2024Article
- Impact of COVID-19 pandemic on short-term outcomes after low anterior resection in patients with rectal cancer: Analysis of data from the Japanese National Clinical Database.Annals of gastroenterological surgery · 2024Article
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Authors and funding
9 authors at 6 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundThe coronavirus disease 2019 (COVID-19) pandemic has rapidly and dramatically influenced healthcare across Japan. However, the influence of the COVID-19 pandemic on the number of newly diagnosed cancer, surgical treatment, and diagnostic examination for cancer types have not been completely investigated all over Japan. This study aimed to analyze the number of cases before and during the COVID-19 pandemic.
methodsThis retrospective study was a survey that asked to provide the number of cases diagnosed with gastric, colorectal, lung, breast, and cervical cancer between January 2019 and December 2020. The survey was sent to tertiary healthcare hospitals, including national cancer institutions, university hospitals, and general hospitals, all over Japan. Data obtained from 105 of 486 surveyed hospitals were evaluated, and the number of cases in each quarter in 2020 was compared with that in the equivalent quarter in 2019.
resultsIn the second quarter (Q2), significant reductions were observed in the median number of newly diagnosed cases from 2019 to 2020: gastric cancer, 26.7% (43 vs. 32, p < 0.001); colorectal cancer, 17.9% (52 vs. 40, p < 0.001); lung cancer, 12.3% (53.5 vs. 47, p < 0.001); and breast cancer, 13.1% (43 vs. 35.5, p < 0.001). A significant reduction of 11.4% (9 vs. 8, p = 0.03) was observed in the third quarter (Q3) for cervical cancer. In Q2, the number of cases decreased by 30.9% (25 vs. 15, p < 0.001) for stage I gastric cancer, by 27.3% (12 vs. 9, p < 0.001) for stage I colorectal cancer, and by 17.6% (13 vs. 10, p < 0.001) for stage II breast cancer. The magnitude of reduction was significant for the localized stages of gastric, colorectal, and breast cancer according to diagnostic examinations in Q2 and surgical and endoscopic treatment in Q3 rather than that for lung or cervical cancer.
conclusionsCOVID-19 has prolonged collateral effects on cancer care, including examination, diagnosis, and surgery, with significant effects on gastric cancer, followed by colorectal, lung, breast, and cervical cancer in Japan.
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