Exposure to bisphosphonates and risk of gastrointestinal cancers: series of nested case-control studies with QResearch and CPRD data.

These findings were also significant in the first sensitivity analysis, which classified use as two or more prescriptions (2.23, 1.54 to 3.22; P<0.001 for shorter term), but results of the second sensitivity analysis, which classified use as all prescriptions including the last six months, failed to reach significance (1.49, 1.06 to 2.08; P=0.02 for shorter term).

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