On September 11, 2017 Ionis Pharmaceuticals, Inc. (NASDAQ: IONS) reported that new data from the clinical program for IONIS-STAT3-2.5Rx (AZD9150) were presented at the 2017 European Society for Medical Oncology (ESMO) (Free ESMO Whitepaper) Annual Congress. The presentation included clinical and safety results from the Phase 1b/2 study evaluating the activity of IONIS-STAT3-2.5Rx in combination with Imfinzi (durvalumab), AstraZeneca’s programmed death ligand (PD-L1) blocking antibody, in patients with advanced solid tumors and recurrent metastatic head and neck cancer (Press release, Ionis Pharmaceuticals, SEP 11, 2017, View Source [SID1234520469]). In the study, the combination treatment resulted in encouraging antitumor activity with a safety and tolerability profile supportive of continued development.
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"Today’s positive data with IONIS-STAT3-2.5Rx are exciting, demonstrating robust activity that is comparable to other promising late-stage checkpoint inhibitor combination therapies for cancer. We continue to be encouraged by the substantial antitumor activity of our Generation 2.5 antisense drugs. Our Generation 2.5 chemistry increases the potency of our antisense drugs, thereby creating opportunities for drugs like IONIS-STAT3-2.5Rx to be effective in targeting more diseases with high unmet need, such as cancers," said Brett Monia, Ph.D., senior vice president of drug discovery and franchise leader for oncology and rare diseases at Ionis Pharmaceuticals. "We are enthusiastic about the broad clinical program AstraZeneca is conducting to evaluate the potential of combining our antisense drugs with immunotherapy approaches to deliver potent and targeted treatment options to patients stricken with various cancers."
"We are encouraged by the anti-tumor activity and safety profile observed in patients with head and neck cancer with AZD9150 in combination with Imfinzi," said Susan Galbraith. M.B., B.Chir., Ph.D. senior vice president and head of oncology innovative medicines unit at AstraZeneca. "We believe this combination therapy supports further study in this group as well as patients with other cancers."
Results from the study were presented at the 2017 ESMO (Free ESMO Whitepaper) Annual Congress in an oral presentation titled, "Phase 1b/2 Study (SCORES) Assessing Safety, Tolerability, and Preliminary Anti-tumor Activity of Durvalumab Plus AZD9150 or AZD5069 in Patients With Advanced Solid Tumors and Refractory and Metastatic (R/M) Squamous Cell Carcinoma of the Head and Neck (R/M-SCCHN)." In the study, combination therapy with IONIS-STAT3-2.5Rx and Imfinzi in 28 PD-L1 treatment naïve patients with R/M-SCCHN resulted in encouraging antitumor activity and deep responses to treatment. The treatment combination demonstrated a 29% (8/28) objective response rate with four partial responses (PR) and four complete responses (CR), of which one was a CR in target lesions only. An additional eight patients on the treatment combination had stable disease (SD) at 12 weeks, resulting in an overall disease control rate of 57% (16/28). Importantly, a complete response was seen in a patient with R/M-SCCHN that was refractory to previous PD-L1 treatment. Combination therapy with IONIS-STAT3-2.5Rx and Imfinzi demonstrated a manageable safety profile. The most common drug-related adverse events occurred infrequently and were similar to those observed with other drugs targeting the JAK/STAT pathway, including mild liver enzyme increases, mild platelet count decreases and mild anemia.
The Phase 1b/2 study is currently ongoing and enrolling an additional treatment group. AstraZeneca is also currently evaluating IONIS-STAT3-2.5Rx in combination with Imfinzi in patients with diffuse large B cell lymphoma.
About IONIS-STAT3-2.5Rx
IONIS-STAT3-2.5Rx, also referred to as AZD9150, is a Generation 2.5 antisense drug designed to reduce the production of signal transducer and activator of transcription 3, or STAT3, for the treatment of patients with cancer. STAT3 is a protein involved in the translation of key factors critical for tumor cell growth and survival and is an important factor in immune cells of the tumor microenvironment where it contributes to the ability of tumors to evade the host immune system. STAT3 is over-active in a variety of cancers, including brain, lung, breast, bone, liver and multiple myeloma.
Ionis licensed IONIS-STAT3-2.5Rx to AstraZeneca for the treatment of cancer. AstraZeneca is currently evaluating IONIS-STAT3-2.5Rx in combination with Imfinzi, AstraZeneca’s programmed death ligand (PDL1) blocking antibody, in multiple Phase 2 studies, including in patients with head and neck cancer in patients with diffuse large B cell lymphoma.