A recent update on ClinicalTrials.gov indicated that Pfizer had ended the trial “due to poor accrual and associated recruitment challenges.” The entry noted that 72 patients with sickle cell disease and recurrent vaso-occlusive crises had been enrolled into the study, out of a target of approximately 280. The spokesperson said the trial was halted “due to slow recruitment,” although it has no read across to another late-stage study in the THRIVE programme. That trial is scheduled to read-out in August.