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Time trend analysis of rare cancer incidence 2011–2018: Nationwide population‐based cancer registries in Japan
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Time trend analysis of rare cancer incidence 2011–2018: Nationwide population‐based cancer registries in Japan
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Time trend analysis of rare cancer incidence 2011–2018: Nationwide population‐based cancer registries in Japan
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Journal Article
Time trend analysis of rare cancer incidence 2011–2018: Nationwide population‐based cancer registries in Japan
2024
Overview
Rare cancers collectively account for a significant proportion of the overall cancer burden in Japan. We aimed to describe and examine the incidence of each rare cancer and the temporal changes using the internationally agreed rare cancer classification. Cancer cases registered in regional population‐based cancer registries from 2011 to 2015 and the National Cancer Registry (NCR) from 2016 to 2018 were classified into 18 families, 68 Tier‐1 cancer groupings, and 216 single cancer entities based on the RARECAREnet list. Crude incidence rates and age‐standardized incidence rates (ASR) were calculated for Tier‐1 and Tier‐2 cancers. The annual percent change and the 95% and 99% confidence limits for annual ASR for each of the 68 Tier‐1 cancers were estimated using the log‐linear regression of the weighted least squares method. The differences in ASRs between 2011 and 2018 were evaluated as an absolute change. A total of 5,640,879 cases were classified into Tier‐1 and Tier‐2 cancers. The ASRs of 18 out of 52 Tier‐1 cancers in the rare cancer families increased, whereas the ASR for epithelial tumors of gallbladder decreased. The ASRs of 6 out of the 16 Tier‐1 cancers in the common cancer families increased, whereas those of epithelial tumors of stomach and liver decreased. There was no significant change in the incidence of the other 40 Tier‐1 cancers. The incidence of several cancers increased due to the dissemination of diagnostic concepts, improved diagnostic techniques, changes in coding practice, and the initiation of the NCR. Time trend of age‐standardized incidence rates of rare cancer families and common cancer families in Japan from 2011 to 2018.
