{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,7]],"date-time":"2026-04-07T16:41:25Z","timestamp":1775580085117,"version":"3.50.1"},"reference-count":20,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2021,11,5]],"date-time":"2021-11-05T00:00:00Z","timestamp":1636070400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Cancer Reports"],"published-print":{"date-parts":[[2022,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>Ribociclib, one of the cyclin\u2010dependent kinases (CDK) 4 and 6 inhibitors, in combination with endocrine therapies has been approved in the treatment of hormonal receptor positive, HER\u20102 negative metastatic breast cancer worldwide. Long\u2010term usage of ribociclib with concomitant drugs, potential drug\u2013drug interaction may develop which can limit the therapeutic value of CDK4\/6 inhibitor.<\/jats:p><\/jats:sec><jats:sec><jats:title>Case<\/jats:title><jats:p>A 62\u2010year\u2010old with history of non\u2010insulin dependent diabetic, dyslipidemia, and essential hypertension was diagnosed with HR\u2010positive, HER\u20102 negative metastatic breast cancer and treated with fulvestrant plus ribociclib. Four weeks after administration, elevated serum creatinine was observed, and then severe lactic acidosis with acute respiratory failure was subsequently reported. Ribociclib and fulvestrant were temporarily discontinued. Three days after renal replacement therapy, her clinical was stabilized. Combination ribociclib with metformin resulted in high plasma metformin levels and dangerous consequences. Hence, special precaution should be considered during concomitant treatment with sensitive transporter substrates.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Metformin associated lactic acidosis may potentially occur after combination with ribocilib, an uncommon but lethal complication from the interaction of these drugs, especially in patients who had preexisting renal impairment.<\/jats:p><\/jats:sec>","DOI":"10.1002\/cnr2.1575","type":"journal-article","created":{"date-parts":[[2021,11,5]],"date-time":"2021-11-05T15:14:17Z","timestamp":1636125257000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Lactic acidosis, a potential toxicity from drug\u2013drug interaction related to concomitant ribociclib and metformin in preexisting renal insufficiency: A case 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