On October 27, 2017 Kura Oncology, Inc. (Nasdaq:KURA), a clinical stage biopharmaceutical company focused on the development of precision medicines for oncology, reported presented updated preliminary results from its Phase 2 open-label trial of tipifarnib, a farnesyltransferase inhibitor, in patients with head and neck squamous cell carcinomas (HNSCC) with HRAS mutations (Press release, Kura Oncology, OCT 27, 2017, View Source [SID1234521243]).
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The results were featured in a late-breaking, oral presentation by Dr. Alan Ho of Memorial Sloan Kettering Cancer Center at the Spotlight on Proffered Papers Session 1 at the AACR (Free AACR Whitepaper)-NCI-EORTC AACR-NCI-EORTC (Free AACR-NCI-EORTC Whitepaper) International Conference on Molecular Targets and Cancer Therapeutics (EORTC-NCI-AACR) (Free ASGCT Whitepaper) (Free EORTC-NCI-AACR Whitepaper), taking place today in Philadelphia.
Four out of six evaluable HRAS mutant HNSCC patients enrolled in the study achieved a confirmed partial response, as defined by standard RECIST criteria. In addition, as of the data cutoff date of October 4, 2017, four HRAS mutant HNSCC patients remained on study in cycles 21, 7, 5 and 3. The patients in cycles 21, 7 and 5 had all experienced partial responses while the patient in cycle 3 experienced stable disease as of the first response assessment in cycle 2. One HRAS mutant HNSCC patient with a confirmed partial response remained on study through cycle 20 and withdrew in cycle 21 with progressive disease. Another HRAS mutant HNSCC patient experienced a best response assessment of stable disease and withdrew from the study in cycle 8.
Tipifarnib has demonstrated clinical activity in previously treated patients, including those who have progressed on chemotherapy with or without cetuximab or immune therapy. The majority of adverse events reported by the investigators have been mild to moderate and are consistent with the adverse event profile previously reported for tipifarnib.
“The responses, durability and safety data with tipifarnib clearly suggest this is an important drug candidate for patients with HRAS mutant head and neck cancers,” said Alan Ho, M.D., Ph.D., of Memorial Sloan Kettering Cancer Center and presenter of the tipifarnib oral presentation. “We are excited to continue to follow these patients and treat additional HRAS mutant patients in the ongoing Phase 2 trial.”
“The consistent clinical activity of tipifarnib in HNSCC patients with HRAS mutations is very encouraging,” said Antonio Gualberto, M.D., Ph.D., chief medical officer of Kura Oncology. “Based on these positive results, we continue to explore available options to rapidly advance the development of tipifarnib and subject to input from regulatory authorities, we plan to initiate a registration-enabling study in HRAS mutant HNSCC in 2018.”
About HRAS Mutant HNSCC
Head and neck cancer is one of the leading causes of cancer-related deaths worldwide, with squamous cell carcinomas accounting for most head and neck cancers. Response rates for the three agents approved for treatment of HNSCC in the second line, including cetuximab and immune therapy agents, are in the range of 13-16%, and median overall survival is up to 7.5 months. HRAS is a proto-oncogene that has been implicated in the development and progression of HNSCC and has been established to be uniquely farnesylated.