In line, we also found a modestly decreased risk of rectal cancer among levothyroxine users, although this did not reach statistical significance.
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Levothyroxine use and the risk of colorectal cancer: a large population-based case-control study.
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The sentences
Stratification by tumour subsite showed a borderline significant risk reduction of rectal cancer, while this was not seen for proximal colon cancer or distal colon cancer.