First-in-human Study of DRP-104 (Sirpiglenastat) as Single Agent and in Combination With Atezolizumab in Patients With Advanced Solid Tumors.

Inclusion Criteria:

Diagnosis of advanced or recurrent, histologically or cytologically confirmed, measurable by RECIST 1.1 metastatic or unresectable solid tumor
Patient must have progressed on, be intolerant of, decline, or be ineligible for, all available standard of care therapies
Part 2: locally advanced or metastatic NSCLC with KEAP1, NFE2L2 and/or STK11 mutation ; Patients must have received at least a platinum doublet chemotherapy and an anti-PD-(L)1 antibody; Received up to 3 lines of systemic anticancer therapy in the recurrent or metastatic setting
Part 2: Recurrent, unresectable or metastatic squamous cell carcinoma of the head and neck (SCCHN) (oropharynx, oral cavity, hypopharynx or larynx); Patient must have received platinum containing chemotherapy and antiPD-(L)1 antibody in recurrent or metastatic setting
Part 3 and 4 - DRP-104 + atezolizumab Prior exposure to any checkpoint inhibitor (anti-PD-1, anti-PD-L1, anti-PDL2, and/or anti-CTLA-4 antibody)
ECOG performance 0 or 1
Patient must consent to allow acquisition of existing FFPE tumor tissue; If unavailable, patient must consent to new pre-treatment tumor biopsy
All SCCHN patient, all NSCLC patients and all patients treated with combination of DRP-104 and atezolizumab will be required to undergo pre-treatment and post-treatment core or excisional biopsies.
Pre-treatment and post-treatment core or excisional biopsies are optional for all remaining patients
Adequate baseline organ function as defined by: Absolute neutrophil count ≥ 1.5 × 109/L (1500/µL); Hemoglobin ≥ 9 g/dL ;Platelets ≥ 75 × 109/L (75,000/µL); Hepatic Total bilirubin ≤1.5 × upper limit of normal (ULN): PT/INR and PTT ≤1.5 × ULN, unless treated with warfarin; AST(SGOT)/ALT(SGPT) ≤3 × ULN or ≤ 5 × ULN for patients with liver metastases; Creatinine clearance ≥ 60 ml/min/1.73m2 measured or calculated
Cardiac QTc (Fridericia) <470 ms
Women of child-bearing potential and men who are sexually active must agree to use one highly effective method of contraception

Exclusion Criteria:

Patients with primary central nervous system tumors and hepatocellular carcinoma
Patients with progressive or symptomatic brain metastases
Leptomeningeal disease
Spinal cord compression not definitively treated with surgery and/or radiation
Uncontrolled pleural effusion, pericardial effusion, or ascites requiring recurrent drainage
Prior glutaminase inhibitor use
Prior systemic anticancer treatment (i.e. chemotherapy, biologic therapy, monoclonal antibodies, investigational agents) within 21 days or 5 half-lives, whichever is shorter
Anti-androgen therapies for prostate cancer, such as bicalutamide, within 4 weeks prior to enrollment
Prior small port palliative radiotherapy within 14 days of start of Cycle 1
Any major surgery within 21 days from start of Cycle 1
Secondary malignancy that is progressing or has required active treatment within the past 3 years, except basal cell carcinoma of the skin, squamous cell carcinoma of the skin, or carcinoma in situ (e.g. breast carcinoma, cervical cancer in situ) that have undergone potentially curative therapy
Has a known history of HIV, or HBV
Gastrointestinal (GI) function impairment or GI disease
Significant, uncontrolled heart disease and/or cardiac repolarization abnormality
Exclusion specific to only Part 3 and 4 (DRP-104 combined with atezolizumab): History of severe allergic, anaphylactic to chimeric or humanized antibodies or fusion proteins; Known hypersensitivity or allergy to biopharmaceuticals produced in Chinese hamster ovary cells; Prior anti-PD-1, anti-PD-L1 and/or anti CTLA4- agent, patient must not have had a serious (> Grade 3) immune-related AE requiring treatment; History of autoimmune disease except hypothyroidism on thyroid replacement hormone therapy; History of idiopathic pulmonary fibrosis, organizing pneumonia (e.g., bronchiolitis obliterans), drug-induced pneumonitis, idiopathic pneumonitis, or evidence of active pneumonitis; Patients with underlying condition requiring systemic corticosteroids (>10 mg daily prednisone equivalents) or other immunosuppressive medications or other systemic immunosuppressant medications may be enrolled in the study after approval by the Medical Monitor; Evidence or history of active or latent tuberculosis infection; Administration of a live, attenuated vaccine within 4 weeks before Cycle 1 Day 1