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A common diabetes drug could help treat cancer, based on its links to insulin and obesity

Obesity, diabetes and cancer are connected. That has paved the way for studies to see whether metformin — the cheap, mainstay diabetes drug — can treat or prevent cancer.

Malignant cells thrive on sugar, or glucose. They take up much more glucose than healthy tissue.
Malignant cells thrive on sugar, or glucose. They take up much more glucose than healthy tissue.Read moreiStock (custom credit) / Getty Images/iStockphoto