A second complete response letter issued by the U.S. FDA for Atara Biotherapeutics Inc.’s allogeneic T-cell immunotherapy Ebvallo (tabelecleucel) for Epstein-Barr virus positive post-transplant lymphoproliferative disease is “a complete reversal of position” by the agency, which had previously confirmed the single arm Allele trial was enough to support a BLA under the accelerated approval pathway, the company said.