Calithera Biosciences, Inc. , a clinical stage biotechnology company focused on the development of novel cancer therapeutics, today will announce new clinical data from the solid tumor expansion cohorts of its lead anti-cancer therapeutic candidate, CB-839, at the 2015 AACR-NCI-EORTC International Conference on Molecular Targets in Boston, Massachusetts. CB-839 is a potent, selective, orally bioavailable glutaminase inhibitor in phase I clinical trials.