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To the Editor,
Recently, Vagaja et al 1 described the first case of coexisting KRAS and NRAS mutations in a single colon cancer in the Journal of Clinical Pathology. Since such coexisting ‘gatekeeper’ mutations in colon cancer have generally been assumed to be mutually exclusive, it was supportive …
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.
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