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The company said Keytruda, its blockbuster cancer drug, in combination with chemoraditation therapy showed improvement in event-free survival, or the period of time a patient remains free of complications compared to a placebo.
However, the results did not meet statistical significance.
Keytruda showed a safety profile similar to previously reported studies, according to Merck.
The drug belongs to a class of treatments called PD-1 inhibitors, which work by boosting the immune system’s ability to fight cancer cells.
