Guadecitabine and Atezolizumab in Treating Patients with Advanced Myelodysplastic Syndrome or Chronic Myelomonocytic Leukemia That Is Refractory or Relapsed

Inclusion Criteria

• Adult subjects with advanced MDS or CMML requiring therapy who were previously treated with either azacitidine or decitabine for at least 4 cycles and deemed to have failed therapy due to progression of disease using International Working Group (IWG) criteria (“refractory”) or losing their previously documented response to the therapy (“relapsed”) and who are ineligible for allogeneic stem cell transplant
• MDS should be classified as: * Intermediate 3+ or higher risk according to the revised international prognostic scoring system (IPSS-R)
• Chronic myelomonocytic leukemia (CMML) should be classified as: * CMML-1 or CMML-2 based on World Health Organization (WHO) classification of 2008
• During the 4 weeks prior to inclusion in study, subjects must have a baseline bone marrow examination including all of the following: * Cytomorphology to confirm bone marrow blasts; * Cytogenetics; AND * Eastern Cooperative Oncology Group (ECOG) status 0-2
• Subject is able to understand and willing to comply with protocol requirements and instructions
• Subject has signed and dated informed consent
• Total bilirubin (except for Gilbert’s syndrome) =< 2.5 x upper limit of normal (ULN)
• Aspartate aminotransferase (ALT) and alanine aminotransferase (AST) =< 3 x ULN
• Creatinine =< 2.5 x ULN
• For women of childbearing potential: agreement to remain abstinent (refrain from heterosexual intercourse) or use contraceptive methods that result in a failure rate of < 1% per year during the treatment period and for at least 90 days after the last dose of atezolizumab * A woman is considered to be of childbearing potential if she is postmenarcheal, has not reached a postmenopausal state (>= 12 continuous months of amenorrhea with no identified cause other than menopause), and has not undergone surgical sterilization (removal of ovaries and/or uterus) * Examples of contraceptive methods with a failure rate of < 1% per year include bilateral tubal ligation, male sterilization, proper use of hormonal contraceptives that inhibit ovulation, hormone-releasing intrauterine devices, and copper intrauterine devices * The reliability of sexual abstinence should be evaluated in relation to the duration of the clinical trial and the preferred and usual lifestyle of the patient; periodic abstinence (e.g., calendar, ovulation, symptothermal, or postovulation methods) and withdrawal are not acceptable methods of contraception
• For men: agreement to remain abstinent (refrain from heterosexual intercourse) or use contraceptive measures, and agreement to refrain from donating sperm, as defined below: * With female partners of childbearing potential, men must remain abstinent or use a condom plus an additional contraceptive method that together result in a failure rate of < 1% per year during the treatment period and for at least 120 days after the last dose of guadecitabine; men must refrain from donating sperm during this same period * With pregnant female partners, men must remain abstinent or use a condom during the treatment period and for at least 30 days after the last dose of guadecitabine to avoid exposing the embryo * The reliability of sexual abstinence should be evaluated in relation to the duration of the clinical trial and the preferred and usual lifestyle of the patient; periodic abstinence (e.g., calendar, ovulation, symptothermal, or postovulation methods) and withdrawal are not acceptable methods of contraception
• Women of childbearing potential (WOCBP) must have a negative serum test (minimum sensitivity 25 IU/L or equivalent units of human chorionic gonadotropin [HCG]) within 72 hours prior to the start of investigational product

Exclusion Criteria

• Any active history of a known autoimmune disease; subjects with vitiligo, type 1 diabetes mellitus, residual hypothyroidism requiring hormone replacement, or conditions not expected to recur in the absence of an external trigger are permitted to enroll
• Subjects with a history of interstitial lung disease; patients requiring continuous supplemental oxygen are excluded to avoid possible complications from pneumonitis
• History of idiopathic pulmonary fibrosis, organizing pneumonitis (e.g., bronchiolitis obliterans), drug-induced pneumonitis, or idiopathic pneumonitis
• Patients who are actively receiving any other anticancer therapy except for hormonal therapy for well-controlled breast or prostate cancer
• Patients with a history of allergic reactions attributed to compounds of similar chemical or biologic composition to HMAs
• Patients with a diagnosis of acute myeloid leukemia (AML) not transformed from MDS or transformed from MDS with > 30% blasts in bone marrow or white blood cells (WBC) > 25 x 10^3/L
• Patients with short life expectancy (less than 3 months) due to comorbidity other than MDS or CMML
• Female subjects who are nursing or pregnant (positive serum or urine beta-human chorionic gonadotropin [B-hCG] pregnancy test)
• Patients with current alcohol or drug abuse
• Patients who have received treatment with an investigational drug within 30 days preceding the first dose of study medication
• Patients with uncontrolled inter-current illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, uncontrolled cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements * Patients with prior infections must be afebrile for >= 72 hours and completed any antibiotics prior to receiving study drug * In patients who received IV antibiotics for active infection, a washout period of 14 days is required prior to initiating study therapy (exception: patients with febrile neutropenia in whom no infectious etiology has been determined/documented) * Patients receiving chronic antimicrobial prophylaxis therapy (e.g. antifungal prophylaxis) may be included in the study provided there is no active infection
• Patients infected with hepatitis B, C or human immunodeficiency virus (HIV), unless they are on stable and effective antiviral treatment
• Serious infection requiring oral or IV antibiotics/antifungals/antivirals and/or hospitalization within 28 days prior to screening * Patients on prophylactic oral antibiotics, antifungals and antivirals due to prolonged neutropenia in the absence of documented infection are eligible * Patients who are treated with IV antibiotics for neutropenic fever, are eligible if no infectious etiology was determined and the last dose of antibiotics was >= 7 days from cycle 1, day 1
• Patients with a condition requiring systemic treatment with either corticosteroids (> 10 mg daily prednisone equivalent) or other immunosuppressive medications within 14 days of randomization. Inhaled or topical steroids and adrenal replacement steroid doses > 10 mg daily prednisone equivalent, are permitted in the absence of uncontrolled autoimmune disease
• Patients with prior allogeneic bone marrow transplantation or prior solid organ transplantation
• Medication-related exclusion criteria
• Prior treatment with anti−PD-1, or anti−PD-L1 therapeutic antibody or pathway-targeting agents
• Prior treatment with anti−cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) therapeutic agents (e.g. ipilimumab)
• Treatment with systemic immunostimulatory agents (including but not limited to interferon [IFN]-alpha or interleukin [IL]-2) within 6 weeks or five half-lives of the drug (whichever is shorter) prior to cycle 1, day 1
• Treatment with any investigational agent within 4 weeks prior to cycle 1, day 1 (or within five half-lives of the investigational product, whichever is longer)
• Treatment with systemic immunosuppressive medications (including but not limited to prednisone, cyclophosphamide, azathioprine, methotrexate, thalidomide, and anti-tumor necrosis factor [anti-TNF] agents) within 2 weeks prior to cycle 1, day 1
• Patients who have received acute, low-dose, systemic immunosuppressant medications may be enrolled
• The use of inhaled corticosteroids and mineralocorticoids (e.g., fludrocortisone) for patients with orthostatic hypotension or adrenocortical insufficiency is allowed
• History of severe allergic, anaphylactic, or other hypersensitivity reactions to chimeric or humanized antibodies or fusion proteins