Kura Oncology Receives Fast Track Designation for Tipifarnib in T-Cell Lymphomas

Kura Oncology announced the U.S. Food and Drug Administration (FDA) has granted Fast Track designation to the Company’s lead drug candidate, tipifarnib, for the treatment of adult patients with relapsed or refractory angioimmunoblastic T-cell lymphoma (AITL), follicular T-cell lymphoma (FTCL) and nodal peripheral T-cell lymphoma with T follicular helper (TFH) phenotype.

"This important designation from the FDA comes just two months after tipifarnib was awarded Fast Track for the treatment of patients with HRAS mutant head and neck squamous cell carcinomas (HNSCC)," said Bridget Martell, M.A., M.D., Acting Chief Medical Officer of Kura Oncology. "We believe that this designation reflects tipifarnib’s significant potential in these devastating disease settings, and we are now actively preparing to initiate a second registration-directed trial of tipifarnib in advanced nodal lymphomas of TFH phenotype, including AITL."

Fast Track designation is granted by the FDA for products that are intended for the treatment of serious or life-threatening disease or conditions, which demonstrate the potential to address an unmet medical need. The designation offers the opportunity for frequent interactions with the FDA to discuss the drug’s development plan and ensure collection of appropriate data needed to support drug approval, as well as eligibility for rolling submission of a New Drug Application.

In December 2019, Kura reported updated clinical data at the American Society of Hematology Annual Meeting showing robust and durable activity from tipifarnib as a monotherapy in relapsed or refractory AITL. The data demonstrated an objective response rate (ORR) of approximately 50% in a heavily pre-treated patient population, with a median of three prior regimens. Additionally, enhanced anti-tumor activity was observed in patients who carried mutations in the killer-cell immunoglobulin-like receptor, or KIR, a CXCL pathway-associated biomarker. These patients had an ORR of 70% and a complete response rate of 40%.

Peripheral T-cell lymphomas compromise up to 20% of all aggressive non-Hodgkin lymphomas and consist of many different subtypes of fast-growing lymphomas, representing approximately 20,000 incident cases per year worldwide. Outcomes for these patients are poor, with 5-year survival of approximately 30%. Although several drugs have been approved in the relapsed and/or refractory setting, none has led to a survival benefit. In addition, the National Comprehensive Cancer Network guidelines currently recommend clinical trials for these patients. Significant advances in the genetic landscape of T-cell lymphomas have led to revisions to the World Health Organization classification and the introduction of new entities. As a result, cases of AITL, an aggressive form of T-cell lymphoma frequently characterized by high levels of CXCL12 expression, are now unified with FTCL under the classification of nodal lymphomas of TFH phenotype.

Kura Oncology’s lead drug candidate, tipifarnib, is a potent, selective farnesyl transferase inhibitor in-licensed from Janssen in December 2014. Previously, tipifarnib was studied in more than 5,000 cancer patients, showing compelling and durable anti-cancer activity in certain patient subsets. However, no molecular mechanism of action was determined that could explain its clinical activity across a range of solid tumor and hematologic indications. Leveraging advances in next-generation sequencing and emerging information about cancer genetics and tumor biology, Kura is seeking to identify those patients most likely to benefit from tipifarnib. The Company has received multiple issued patents for tipifarnib in the U.S. and foreign countries, including one issued by the U.S. Patent and Trademark Office in September 2019 that further extends Kura’s exclusivity to the use of any farnesyl transferase inhibitor for the treatment of CXCL12-expressing peripheral T-cell lymphoma and acute myeloid leukemia.

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