Metformin for Primary Colorectal Cancer Prevention in Diabetic Patients: A Case-Control Study in a US Population
Abstract
Emerging evidence from observational studies has suggested that metformin may be beneficial in the primary prevention of colorectal cancer (CRC). However, to the authors' knowledge, none of these studies was conducted in a US population. Because environmental factors such as Western diet and obesity are implicated in the causation of CRC, a large case‐control study was performed to assess the effects of metformin on the incidence of CRC in a US population.
How strong is the evidence?
Evidence Hub reads this as a case-control, done in people. Its evidence level is 4 of 5 (Low · observational). Observational designs can show an association but not prove cause.
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