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I dont understand why covid approval would not start the cancer exclusivity clock.

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EUA is a temporary approval that is rescinded at the time an emergency is declared over, not a full approval.

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Presumably the leronlimab molecule was patented many years ago. The patent on the molecule may have ten years or less to expiration.

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I think current expiration on the basic patent is 2023.

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But then a patent for leronlimab for covid has more than 17 years left because the c0vid patent is not yet issued.

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20 year patent protection but there is no law forbidding off label use by a doctor of a generic drug. So once FDA exclusivity lapses and a generic drug is approved (may take 2 or more years) it might be prescribed for indications that have a longer patent life.