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A flick of the prescriber’s pen could save $825 million a year on lung cancer care in the U.S.

That’s the finding of a new study on the immunotherapy drug pembrolizumab, marketed commercially as Keytruda by Merck. By switching to weight-based dosing — instead of a fixed dose of 200 mg — doctors could quickly reduce costs of the intravenous therapy without compromising its effectiveness, the study concludes.

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The finding could spur changes in care for thousands of U.S. patients with lung cancer, which kills about 158,000 Americans a year. The study estimates that weight-based dosing would cut costs of the treatment from $3.4 billion to $2.6 billion. The findings were presented Saturday at the annual meeting of the American Society of Clinical Oncology.

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