Atara Biotherapeutics, Inc., an off-the-shelf T-cell immunotherapy company, develops treatments for patients with cancer, autoimmune, and viral diseases in the United States. It is developing tabelecleucel, a T-cell immunotherapy that is Phase III clinical trials for the treatment of rituximab-refractory epstein-barr virus (EBV) associated post-transplant lymphoproliferative disorder, as well as other EBV associated hematologic and solid tumors, including nasopharyngeal carcinoma. The company is also developing next-generation CAR T immunotherapies for patients with hematologic malignancies and solid tumors, and autoimmune and viral diseases, including ATA2271 for mesothelin; ATA2321 for acute myeloid leukemia; and ATA2431 and ATA3219 for B-cell lymphomas, as well as ATA188 and ATA190 that are in Phase I clinical trials for the treatment of multiple sclerosis. In addition, it is developing ATA621 against the BK and JC viruses; ATA368 for patients with human papillomavirus and associate