U.S. Senator Elizabeth Warren has sent the nation's top patent regulator a letter urging close scrutiny of Merck & Co's requests for new patents on its blockbuster cancer treatment Keytruda, saying further efforts to protect the drug could be an abuse of the system.
Merck said it is "continuously innovating to enhance the benefits of Keytruda in order to reach greater numbers of patients and to increase efficacy and convenience of the treatment."
Merck, which reported $20.9 billion in 2022 sales of Keytruda, has relied on the immunotherapy to fuel its growth. It initially demonstrated impressive survival benefits in the deadliest form of skin cancer and has since been approved for many types of cancer.
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