On February 15, 2018 Kura Oncology, Inc. (Nasdaq:KURA), a clinical-stage biopharmaceutical company focused on the development of precision medicines for oncology, reported the presentation of updated preliminary results from its Phase 2 clinical trial of its lead product candidate, tipifarnib, in patients with head and neck squamous cell carcinomas (HNSCC) with HRAS mutations (Press release, Kura Oncology, FEB 15, 2018, View Source [SID1234524150]).
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The results are being presented by Alan Ho, M.D., Ph.D., of Memorial Sloan Kettering Cancer Center at the 2018 Multidisciplinary Head and Neck Cancers Symposium, taking place today in Scottsdale, Arizona. A copy of the poster is available online at www.kuraoncology.com.
Nine patients with HRAS mutant HNSCC had been enrolled in the Phase 2 trial as of the February 8, 2018 data cutoff date. Five out of the six evaluable patients achieved a confirmed, partial response as defined by standard RECIST criteria for an overall response rate of 83% (36-99.6%, 95%CI), including durable responses of more than 18 months in two patients. The sixth evaluable patient experienced tumor shrinkage and prolonged disease stabilization. Three additional patients were enrolled since the last update in October 2017, however, none of the three additional patients was evaluable as of the February 8th data cutoff date; two are off study and one was still too early for disease assessment.
"We continue to be very encouraged by the high level of clinical activity of tipifarnib observed in patients with HRAS mutant HNSCC," said Antonio Gualberto, M.D., Ph.D., Head of Development and Chief Medical Officer of Kura Oncology. "In addition to rapid responses in patients who do not appear to benefit from current standards-of-care, we are also seeing dramatic resolution of disfiguring and often painful lesions. We are continuing to enroll patients in the ongoing Phase 2 trial while we gather input from regulatory agencies on the design of a potential registrational trial of tipifarnib in HRAS mutant HNSCC anticipated to be initiated later this year."
All patients joined the trial upon progression from at least one line of therapy, including chemotherapy, cetuximab or immune therapy, with patients having experienced a median of two prior therapies (range, 1-4). Response rates for the three agents approved for treatment of HNSCC in the second line are in the range of 13-16%, with a median progression-free survival of approximately 2 months and a median overall survival of up to 7.5 months.
Tipifarnib was generally well-tolerated in the trial. Adverse events observed are consistent with the known safety profile of tipifarnib.
In September 2017, Kura announced that the Phase 2 trial in HRAS mutant HNSCC had achieved its primary efficacy endpoint prior to the completion of enrollment. The trial protocol required four confirmed, partial responses, per RECIST 1.1 criteria, out of 18 patients to meet its primary endpoint.
About Tipifarnib
Kura Oncology’s lead candidate, tipifarnib, is an inhibitor of farnesylation, a key cell signaling process implicated in cancer initiation and development. In extensive clinical trials, tipifarnib has shown a well-established safety profile and compelling and durable anti-cancer activity in certain patient subsets. Preclinical and clinical data suggest that, in the appropriate context, tipifarnib has the potential to provide significant benefit to cancer patients with limited treatment options. Leveraging advances in next-generation sequencing as well as emerging information about cancer genetics and tumor biology, Kura Oncology is seeking to identify patients most likely to benefit from tipifarnib. In addition to its development program in solid tumors with HRAS mutations, Kura has identified potential biomarkers of activity for tipifarnib in hematologic malignancies, including peripheral T-cell lymphomas (PTCL), myelodysplastic syndromes (MDS), acute myeloid leukemia (AML) and chronic myelomonocytic leukemia (CMML).