FDA halts all Allogene cell therapy trials after chromosome problem detected October 8, 2021 Auto Bot BioPharma, biopharma nl, cell therapy, Clinical Trials, FDA, Legal, Pharma, South San Francisco 0 All of Allogene Therapeutics’ clinical trials are now under an FDA clinical hold. The halt was handed down after one patient in the company’s most advanced study developed what the company described as a “chromosomal abnormality.”