U.S. officials have given a green light for two clinical trials testing AstraZeneca's cancer immunotherapy drug durvalumab in head and neck cancer to resume recruiting patients, lifting a hold imposed following cases of bleeding.

The British drugmaker said on Tuesday that one of the late-stage Phase III trials had already re-opened for new patient enrolment and the second was expected to resume recruitment shortly.

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News of the partial hold on the trials, imposed at the end of last month, had spooked investors since durvalumab is AstraZeneca's most important pipeline medicine.