On May 10, 2016 Calithera Biosciences, Inc. (Nasdaq:CALA), a clinical-stage pharmaceutical company focused on discovering and developing novel small molecule drugs directed against tumor metabolism and tumor immunology targets for the treatment of cancer, reported its financial results for the first quarter ended March 31, 2016 (Press release, Calithera Biosciences, MAY 10, 2016, View Source;p=RssLanding&cat=news&id=2167159 [SID:1234512234]). As of March 31, 2016, cash, cash equivalents and investments totaled $68.3 million.
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"During the first quarter, we continued to advance our development pipeline by recruiting patients into clinical studies of CB-839, and preparing for an Investigational New Drug (IND) application for CB-1158, as well as expanding our clinical leadership team," said Susan Molineaux, Ph.D., President and Chief Executive Officer of Calithera. "More recently, at the 2016 American Association of Cancer Research annual meeting, we and our collaborators presented four abstracts highlighting synergy studies of CB-839 and CB-1158. CB-839 is currently enrolling multiple combination cohorts in our Phase Ib clinical trials, for which updates are planned in June."
First Quarter 2016 and Recent Highlights
Enrollment continues across CB-839 Phase Ib combination cohorts. Data from the Phase I solid tumor trial has been accepted for presentation at the 2016 American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) annual meeting. Initial results of CB-839 in combination with paclitaxel in patients with triple negative breast cancer will be presented in a poster and discussion on June 5, 2016. Initial results of CB-839 alone and in combination with everolimus in patients will renal cell carcinoma will be presented in a poster on June 6, 2016.
CB-839 preclinical findings, including combinations with immuno-oncology therapies, presented at the American Association of Cancer Research. In April 2016, Calithera presented preclinical data for CB-839 in combination with immuno oncology-agents. The combination of CB-839 and anti-PD-L1 or anti-PD-1 substantially increased the number of tumor regressions seen in the CT26 syngeneic colon carcinoma model. Synergistic effects with CB-839 and anti-PD-L1 were also observed in a B16 melanoma model. Both of these agents are known to affect metabolism in the tumor microenvironment. Treatment with anti-PD-1 or PD-L1 increases glucose metabolism in T cells and CB-839 increases the amount of glutamine available for T cells because it inhibits the avid metabolism of glutamine by the tumor itself. T cells require adequate levels of these two key nutrients to expand and mount a strong anti-tumor response.
CB-1158 preclinical findings presented at the American Association of Cancer Research. CB-1158, a highly selective, orally bioavailable, small molecule inhibitor of human arginase with nanomolar potency, demonstrated single agent efficacy in animal models. Inhibition of tumor growth was accompanied by an increase in the local concentration of arginine, and the induction of multiple pro-inflammatory changes in the tumor microenvironment. CB-1158 increased CD8+ T-cell infiltrates in a lung tumor model. The addition of CB-1158 to anti-CTLA-4 and anti-PD-1 significantly inhibited tumor growth and reduced metastases in a mouse model that was resistant to dual checkpoint inhibitor therapy. CB-1158 was well tolerated as a single agent and in combination with checkpoint inhibitors in animal studies.
Key hire and promotion in clinical group. Calithera announced today the expansion of its clinical group with the hiring of Sam Whiting, M.D., Ph.D. as Vice President of Clinical Development. Most recently, Dr. Whiting served as Vice President of Research and Clinical Development at Gradalis, Inc. Previously Dr. Whiting was an assistant member at the Fred Hutchinson Cancer Research Center (FHCRC), and assistant professor at the University of Washington where he was clinical director of gastrointestinal oncology. Dr. Whiting received his M.D. and Ph.D. degrees and completed his internal medicine residency at the University of Washington, and medical oncology fellowship at the FHCRC. Keith Orford, M.D., Ph.D., who joined Calithera in January 2015, has been promoted to Senior Vice President of Clinical Development.
Selected First Quarter 2016 Financial Results
Research and development expenses were $7.1 million for the three months ended March 31, 2016, compared with $5.6 million for the same period in the prior year. The increase of $1.4 million was primarily attributed to increased development activities in Calithera’s arginase inhibitors program as it plans to file an IND in mid-2016, partially offset by a decrease of $0.4 million related to Calithera’s licensing arrangements.
General and administrative expenses were $2.6 million for the three months ended March 31, 2016, compared with $2.2 million for the same period in the prior year. The increase of $0.4 million was primarily due to higher employment related expenses, including stock-based compensation expense.
Net loss from operations for the three months ended March 31, 2016 was $9.6 million.