Atara Positive Results for Epstein-Barr Virus-Associated Leiomyosarcoma: ESMO

— Second EBV‑associated solid tumor with encouraging responses to tab-cel® — Tab-cel® safety appears consistent with a favorable risk profile and previous observations — Results were presented today in an oral session at the European Society for Medical Oncology Immuno-Oncology Congress 2018

Atara Biotherapeutics, Inc. (Nasdaq: ATRA), a leading off-the-shelf, allogeneic T-cell immunotherapy company developing novel treatments for patients with cancer, autoimmune and viral diseases, today presented results indicating that tab-cel® (tabelecleucel) was generally well tolerated with responses for patients with Epstein-Barr virus-associated leiomyosarcoma (EBV+ LMS). EBV+ LMS is a rare soft tissue sarcoma that occurs in transplant and immunosuppressed patients and is typically an aggressive radiation- and chemotherapy-resistant disease with poor patient outcomes. The results were presented in an oral session at the European Society for Medical Oncology Immuno-Oncology (ESMO I‑O) Congress 2018 taking place in Geneva, Switzerland.

“The EBV+ LMS results presented at ESMO I-O are the second example, along with nasopharyngeal carcinoma (NPC), of a difficult-to-treat, EBV-associated solid tumor with encouraging responses to tab‑cel®,” said Dietmar Berger, M.D., Ph.D., Global Head of Research and Development of Atara Biotherapeutics. “Observations of responses based on standard-CT and metabolic PET-CT imaging, in the context of prolonged survival, further highlight the opportunity for tab‑cel® and off-the-shelf, allogeneic T-cell immunotherapy in EBV-associated cancers beyond our ongoing studies for patients with post‑transplant lymphoproliferative disease (PTLD) and NPC.”

The oral presentation summarized the evaluation of tab-cel® in an analysis of EBV+ LMS patients from three clinical studies, 2 single-center, open-label studies (NCT00002663, NCT01498484) and the multi‑center expanded access protocol (EAP) study (NCT02822495). Twelve patients with EBV+ LMS received one or more doses of tab-cel®, of whom 10 were assessed for responses with two patients not evaluable. Two of the 10 patients achieved a partial response via CT-based RECIST 1.1 criteria and eight patients achieved stable disease. In the two single-center studies with longer follow-up, six of eight patients survived more than 27 months and the estimated median survival was 77.4 months. At the time of this analysis, responses assessed by PET-CT imaging were available from the multi-center EAP study where 3 of the 4 patients achieved a metabolic response. Tab-cel® was generally well tolerated and the safety appeared consistent with a favorable risk profile and previous clinical studies.

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