「若年層」で「大腸がん」は増加しているのか？
大腸がんの若年層（50歳未満）での発生率が増加しているという報道は事実だが、その絶対リスクは依然として低い。高齢層での減少が全体の発生率を押し下げているため、「若年層で増加」という部分だけ切り取ると誤解を招く。データ全体を冷静に解釈する必要がある。
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