The impact of metformin on survival in patients with melanoma-national cohort study.

Purpose: The primary study outcome was melanoma-specific mortality in patients with type 2 diabetes mellitus (T2DM) using metformin.

Methods: Data regarding patients were provided by the Lithuanian Cancer Registry and were linked with National Health Insurance Fund in accordance with unique personal identification numbers during the period of thirteen years.

Results: About 2817 patients met eligibility criteria and were included in the retrospective cohort study.