Adaptimmune Therapeutics (ADAP) Updates on NY-ESO SPEAR at ESMO 2016

October 10, 2016 6:34 AM EDT
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Adaptimmune Therapeutics plc (Nasdaq: ADAP) announced a poster presentation of updated data on its lead clinical program, an NY-ESO SPEAR (Specific Peptide Enhanced Affinity Receptor) T-cell receptor therapy, in patients with synovial sarcoma at the European Society for Medical Oncology (ESMO) 2016 Congress.

“These data help clarify the design of our upcoming pivotal studies in sarcoma,” said Dr. Rafael Amado, Adaptimmune’s Chief Medical Officer. “We have seen durable tumor responses to our SPEAR T-cells and the preliminary benefit:risk profile appears favorable. Further, although the data are preliminary, we do see activity against tumors with lower levels of NY-ESO expression, which we hope will further expand the utility of this therapy, and we have evidence that fludarabine is required in the pre-conditioning regimen. With these data in hand, we will initiate Cohort 4 with our modified fludarabine pre-conditioning regimen, and continue toward our goal of bringing this novel TCR-based immunotherapy to sarcoma patients.”

In a poster presentation entitled, "Open Label Non-Randomized Multi-Cohort Pilot Study of Genetically Engineered NY-ESO-1 Specific NY-ESO SPEAR T-cells in HLA-A*02+ Patients with Synovial Sarcoma," Crystal Mackall, M.D., Professor of Pediatrics and Medicine; Associate Director of the Stanford Cancer Institute, provided an update on the following synovial sarcoma cohorts:

  • Cohort 1: Subjects with high (≥50 percent 2+/3+ by IHC) NY-ESO-1 antigen expression and lymphodepletion with cyclophosphamide and fludarabine
  • Cohort 2: Subjects with low (>1 percent to <50 percent 2+/3+ by IHC) NY-ESO-1 antigen expression and lymphodepletion with cyclophosphamide and fludarabine
  • Cohort 3: Subjects with high (≥ 50 percent 2+/3+ by IHC) NY-ESO-1 antigen expression and lymphodepletion with cyclophosphamide alone (no fludarabine)
  • Cohort 4: Subjects with high (≥ 50 percent 2+/3+ by IHC) NY-ESO-1 antigen expression and lymphodepletion with a modified (lower) dose than Cohort I of cyclophosphamide and fludarabine

Cohort 1Adaptimmune has previously announced that in the first cohort of synovial sarcoma patients, NY-ESO SPEAR T-cells demonstrated a robust clinical response, including a 50 percent (6/12) response rate, and a 60 percent response rate (6/10) in those who received the target dose of at least 1x109 transduced cells. The median duration of response is reported to be approximately 31 weeks (August 31 data cutoff). Ongoing NY-ESO SPEAR T-cell persistence has been observed for up to 36 months.

Cohort 2Four subjects of a targeted 10 are currently enrolled in the second cohort; three patients have been treated with NY-ESO SPEAR T-cells. As of August 31, 2016 best responses seen in these three patients were: one partial response (PR), one stable disease (SD), and one progressive disease (PD).

Cohorts 3 and 4Five patients are currently enrolled in the third cohort; no objective responses have been observed to date. As pre-specified in the protocol, enrollment in cohort 3 has ceased, and company has initiated enrollment in Cohort 4.

TolerabilityNY-ESO SPEAR T-cells continue to demonstrate a generally acceptable benefit: risk profile in all treated patients to date. The most common (>30%) related adverse events include pyrexia, lymphopenia, decreased white blood cell (WBC), nausea, anemia, neutropenia, fatigue, decreased platelet count (PLT), sinus tachycardia, and rash. Most common toxicities related to therapy can be monitored and managed with medical intervention and supportive care. While there are differences in the patient populations, incidence of cytokine release syndrome (CRS) with NY-ESO-1c259 SPEAR T appears to be of lower frequency and severity than reported with CD19 CAR-T therapy. As previously reported at the 2016 Annual American Society of Clinical Oncology (ASCO) Meeting, there was one fatal SAE of bone marrow failure in Cohort 2 of our synovial sarcoma trial. Internal investigations have not identified a mechanism by which NY-ESO SPEAR T-cells may have caused bone marrow failure.

Adaptimmune’s SPEAR T-cell candidates are novel cancer immunotherapies that have been engineered to target and destroy cancer cells by strengthening a patient’s natural T-cell response. T-cells are a type of white blood cell that play a central role in a person’s immune response. Adaptimmune’s goal is to harness the power of the T-cell and, through its multiple therapeutic candidate, significantly impact cancer treatment and clinical outcomes of patients with solid and hematologic cancers.

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