Study of the Glutaminase Inhibitor CB-839 in Solid Tumors

Many tumor cells, in contrast to normal cells, have been shown to require the amino acid
glutamine to produce energy for growth and survival. To exploit the dependence of tumors on
glutamine, CB-839, a potent and selective inhibitor of the first enzyme in glutamine
utilization, glutaminase, will be tested in this Phase 1 study in patients with solid tumors.

This study is an open-label Phase 1 evaluation of CB-839 in patients with advanced solid
tumors. The study will be conducted in 2 parts. Part 1 is a dose escalation study enrolling
patients with locally-advanced, metastatic and/or refractory solid tumors to receive CB-839
capsules orally twice or three times daily.

In Part 2, patients with each of the following diseases will be enrolled: A) Triple-Negative
Breast Cancer, B) Non-Small Cell Lung Cancer (adenocarcinoma), C) Renal Cell Cancer, D)
Mesothelioma, E) Fumarate hydratase (FH)-deficient tumors, F) Succinate dehydrogenase
(SDH)-deficient gastrointestinal stromal tumors (GIST), G) SDH-deficient non-GIST tumors, H)
tumors harboring mutations in isocitrate dehydrogenase-1 (IDH1) or IDH2, and I) cMyc mutation
tumors.

As an extension of Parts 1 & 2, patients will be treated with CB-839 in combination with
standard chemotherapy. Combination groups include: Pac-CB, CBE, CB-Erl, CBD, and CB-Cabo.
Pac-CB: patients with locally-advanced or metastatic TNBC will be treated with paclitaxel and
CB-839. CBE: patients with advanced clear cell RCC or papillary RCC will be treated with
everolimus in combination with CB-839. CB-Erl: patients with advanced NSCLC lacking the T790M
EGFR mutation will be treated with erlotinib and CB-839. CBD: patients with NSCLC harboring
KRAS mutation will be treated with docetaxel and CB-839. CB-Cabo: patients with
histologically confirmed diagnosis of locally-advanced, inoperable or metastatic RCC treated
with cabozantinib in combination with CB-839.

All patients will be assessed for safety, pharmacokinetics (plasma concentration of drug),
pharmacodynamics (inhibition of glutaminase), biomarkers (biochemical markers that may
predict responsiveness in later studies), and tumor response.