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Researchers are evaluating the safety, tolerability, and effectiveness of CYB003, a Deuterated Psilocin Analog, compared to a placebo when added to current antidepressant treatment in adults with moderate to severe Major Depressive Disorder (MDD). This Phase III trial focuses on participants aged 18 to 85 years who have had inadequate response to a stable antidepressant dose, aiming to better understand how CYB003 might improve depressive symptoms. Participants receive oral doses of CYB003 or matching placebo along with manualized psychological support provided by trained facilitators. The treatment period includes multiple dosing sessions with monitoring and assessments throughout. Placebo is used as a comparator to evaluate the combined safety and efficacy of CYB003 in this population. During the study, participants undergo evaluations using the Montgomery-Åsberg Depression Rating Scale (MADRS) at several time points, including screening, baseline, and multiple days up to the end of treatment at Day 42. Researchers monitor symptoms, side effects, and overall safety. Participants provide informed consent and are assessed regularly to track changes in depression severity and any adverse events over the course of the study.

Researchers are conducting a Phase 3, multicenter, randomized, double-blind, placebo-controlled study to assess the efficacy and safety of azetukalner in adults diagnosed with bipolar I or II disorder who are currently experiencing a depressive episode. The study focuses on participants aged 18 to 74 years who have bipolar depression, aiming to better understand treatment effects in this population. Participants will be randomly assigned to receive either azetukalner at a dose of 20 mg or a placebo, both taken orally once daily with food, preferably with the evening meal. The treatment period lasts for 6 weeks, during which participants will be monitored closely. During the study, participants will undergo assessments including evaluation of depressive symptoms using the Montgomery-Åsberg Depression Rating Scale (MADRS) from baseline to Week 6. Researchers will monitor safety and treatment effects throughout the study. Total participation time covers the 6-week treatment period with ongoing monitoring of symptom changes and safety.

Researchers are evaluating the clinical efficacy, safety, and tolerability of azetukalner as a monotherapy in adults diagnosed with moderate-to-severe Major Depressive Disorder (MDD). This Phase 3, multicenter, randomized, double-blind, placebo-controlled study focuses on participants aged 18 to 74 who have experienced their first major depressive episode before age 50. The study aims to compare azetukalner with placebo in treating MDD over a 6-week period. Participants will receive either azetukalner 20 mg or placebo orally once a day with food, preferably with the evening meal, for 6 weeks. The treatment is administered as a daily oral dose, and participants are randomly assigned to one of the two groups. The study is designed to maintain blinding of treatments to both participants and researchers. During the study, participants' depression symptoms will be assessed using the Hamilton Depression Rating Scale (HAMD-17) to measure changes from baseline to Week 6. Researchers will also monitor safety and tolerability throughout the treatment period. Participants will undergo regular evaluations, and the study includes careful screening to ensure eligibility and monitor any adverse effects during the 6 weeks of treatment.

Researchers are evaluating the safety and effectiveness of brenipatide combined with standard care compared to a placebo with standard care in adults with schizophrenia. This phase 2 study aims to understand how well brenipatide works as an additional treatment for schizophrenia and monitor any side effects. Participants eligible for the study must have schizophrenia and be on stable standard care medication. The trial consists of three main periods: a screening period lasting about one month, a treatment period that can last up to 12 months, and a follow-up period of approximately two months. During the treatment phase, participants receive either brenipatide or placebo administered by subcutaneous injection alongside their standard care. The study includes careful monitoring and adherence to study procedures such as self-injection, keeping diaries, and completing questionnaires. Participants will be involved in regular visits and assessments throughout the entire study duration, which may last up to 15 months. Researchers will measure changes in body weight from baseline to week 52 as a primary outcome. Participants will also be monitored for safety and efficacy through ongoing evaluations, including the use of electronic or paper diaries and required questionnaires to track their progress and response to treatment.

Researchers are evaluating the drug disitamab vedotin, alone or combined with pembrolizumab, to treat urothelial cancer that expresses HER2. This cancer is locally advanced, cannot be removed by surgery, or has spread to other parts of the body. The study aims to see how well the drug works and how safe it is for participants by monitoring side effects and treatment responses. Participants will receive disitamab vedotin through an intravenous (IV) infusion every two weeks. Pembrolizumab, when given, is administered by IV on the first day of each six-week cycle. The study includes several groups, called cohorts, each with different treatment histories and eligibility criteria. Treatment and evaluation may continue for about two years. During the study, participants will have regular tests including scans to measure tumor response, lab tests, heart function checks, and monitoring for adverse events. Researchers will also track drug levels in the blood and any changes in heart function. The study will assess confirmed tumor responses and safety outcomes over approximately two years, with close monitoring to understand how participants respond to the treatments and any side effects experienced.

Researchers are evaluating the effectiveness and safety of SP-624 compared to a placebo in adults aged 18 to 65 with moderate to severe Major Depressive Disorder (MDD). This Phase 2B study focuses on treating this condition and assesses changes in depression severity using the Montgomery-Asberg Depression Rating Scale (MADRS) from baseline to week 4. Participants receive either SP-624 or a placebo once daily. The SP-624 treatment consists of two capsules taken orally each day, providing a total dose of 20 mg. Those in the placebo group take two matching placebo capsules daily. The study is designed as a multi-center, double-blind, randomized, placebo-controlled trial. During the study, participants will be monitored for changes in depression severity through the MADRS assessment from the start of the study to week 4. Researchers will also evaluate safety and tolerability throughout the treatment period. The total study duration and specific follow-up details are not provided but include careful observation of participants' health and response to treatment.

Researchers are evaluating whether tucatinib combined with trastuzumab and mFOLFOX6 works better than the standard treatments for people with HER2 positive metastatic colorectal cancer, which is cancer that has spread or cannot be removed by surgery. This phase 3 study also aims to identify the side effects that may occur with this drug combination. Participants must have HER2 positive disease confirmed by testing and measurable cancer according to specific criteria. Participants will be randomly assigned to one of two groups. One group will receive tucatinib taken orally twice daily along with intravenous trastuzumab and the mFOLFOX6 chemotherapy regimen, which includes oxaliplatin, leucovorin or levoleucovorin, and fluorouracil given by IV every two weeks. The other group will receive standard care, which could be mFOLFOX6 alone or combined with either bevacizumab or cetuximab, both given by IV on specific schedules. Treatment continues as per the study protocol. During the study, participants will be monitored for progression-free survival up to about three years using imaging reviewed by independent experts. Researchers will assess side effects and disease response. Participants must be able to provide tumor tissue samples for testing and have a good performance status. The study includes brain imaging to check for metastases and monitors safety closely throughout the treatment period.

Researchers are conducting a Phase 2, randomized, double-blind, placebo-controlled study to assess the efficacy, safety, and tolerability of the oral drug ML-007C-MA in adult inpatients aged 18 to 64 years who have schizophrenia and are experiencing a sudden worsening of psychosis. The study aims to compare ML-007C-MA to a placebo in treating symptoms of schizophrenia that are not well controlled, with effectiveness measured by changes in the Positive and Negative Syndrome Scale (PANSS) total score. Participants will be assigned to one of three groups: one receiving ML-007C-MA twice daily at a dose of 210/3 mg, another receiving ML-007C-MA once daily at 330/6 mg, and a third group receiving a matched placebo. The treatment period lasts 5 weeks, during which participants remain in an inpatient setting. The study is designed to maintain blinding and closely monitor participants' response to the treatments. Throughout the study, participants will undergo evaluations at the start and end of treatment, including assessments using the PANSS to measure schizophrenia symptoms. Researchers will monitor safety, tolerability, and any side effects while participants remain hospitalized and under observation for the full study duration. The main measure of success is the change in PANSS total score from baseline to the end of treatment after 5 weeks.

Researchers are evaluating the long-term safety and tolerability of KarXT in treating mania or mania with mixed features in adults with Bipolar-I disorder. This phase 3, open-label extension study aims to better understand how KarXT performs over an extended period in this population. The study includes participants who either completed previous double-blind placebo-controlled studies or are newly diagnosed with Bipolar-I disorder experiencing manic symptoms. Participants receive KarXT at specified doses on certain days, with some also taking therapeutic doses of Lithium, Valproate, or Lamotrigine as part of their treatment. The study does not mention a placebo group during this extension, focusing instead on monitoring the long-term effects of KarXT alone or in combination with these established therapies. During the study, participants are monitored for adverse events up to week 54 to assess safety. Evaluations include psychiatric assessments using scales such as the Young Mania Rating Scale and CGI-BP score at screening and baseline. Researchers will track treatment-emergent adverse events and overall tolerability throughout the study duration, which lasts up to 54 weeks for each participant.

PRIMARY OBJECTIVES: I. To compare event free survival post reinduction (EFS PR) between blinatumomab vs. blinatumomab/nivolumab in Group 4 patients aged ≥ 1 to \<31 years old with first relapse of CD19+ B ALL. II. To compare EFS PR (EFS post-reinduction) between consolidation with blinatumomab vs. blinatumomab/nivolumab in Group 3 patients aged \>= 1 to \< 31 years old with first relapse of CD19+ B ALL. SECONDARY OBJECTIVES: I. To evaluate the safety and tolerability of blinatumomab/nivolumab in patients aged \>= 1 to \< 31 years old with first relapse of CD19+ B ALL. EXPLORATORY OBJECTIVES: I. In Group 4 patients, compare EFS PR between blinatumomab monotherapy and blinatumomab/nivolumab arms as compared to similar patients treated on the predecessor trial AALL1331. II. In Group 4 patients, compare toxicity as defined by grade 3 or greater adverse events during the first cycle of blinatumomab or blinatumomab/nivolumab. III. In Group 4 patients, compare MRD negative second remission (Rem-2) rate after the first cycle of immunotherapy between blinatumomab monotherapy and blinatumomab/nivolumab arms. IV. In patients with Down syndrome (DS) with first relapse of B-ALL, describe the safety, tolerability and efficacy (as defined by MRD negative second remission, Rem-2) after up to two cycles of blinatumomab/nivolumab. V. With each Group, perform subset analyses of EFS and overall survival (OS) based on features including degree of marrow disease at relapse, age, sex, body mass index, cytogenetics, site(s) of relapse, percent peripheral blasts at relapse and absolute lymphocyte count at first relapse. OUTLINE: Patients \>= 18 years old with marrow +/- extramedullary (EM) relapse of any duration after initial diagnosis, or patients \< 18 years old with marrow +/- EM relapse \< 24 months after initial diagnosis are assigned to Group 1. Patients \< 18 years old with marrow +/- EM relapse \>= 24 months from initial diagnosis, or all isolated extramedullary (IEM) relapses \>= 1 to \< 31 years old are assigned to Groups 2-3 re-induction. Patients with DS are assigned to Arm G. NOTE: Patients in Group 1 and DS patients with white blood cells (WBC) \>= 30,000/uL, CNS 2/3 disease, or testicular disease must first receive 1 of 3 pre-immunotherapy treatments. Starting with amendment 4C (9/19/2024), patients with DS are assigned to group 3 or 4. Patients \< 18 years with bone marrow first relapse ≥ 36 months from initial diagnosis with MRD \<0.1% after VXLD reinduction or with isolated CNS/testicular extramedullary relapse occurring ≥ 18 months from initial diagnosis with MRD \<0.1% after VXLD reinduction are assigned to group 3. Patients who do not meet criteria for group 3 will be assigned to group 4. Patients with Down syndrome ≥ 1 to \< 31 years of age with first bone marrow relapse of B ALL are assigned to arm G. PRE-IMMUNOTHERAPY TREATMENT FOR PATIENTS WITH WBC \>= 30,000/uL (CLOSED TO ACCRUAL 9/19/2024 EXCEPT FOR ARM G) : Patients receive methotrexate (MTX) intrathecally (IT) or cytarabine IT or intrathecal triple therapy (ITT) consisting of MTX, hydrocortisone sodium succinate, and cytarabine IT at the time of diagnostic lumbar puncture (LP) or on day 1 (if intrathecal therapy is given with relapse diagnostic LP \< 7 days prior to the start of protocol therapy). Patients also receive dexamethasone intravenously (IV) or orally (PO) twice daily (BID) on days 1-5, vincristine sulfate via infusion or IV push over 1 minute on day 1. Patients with DS also receive leucovorin calcium PO or IV every 6 hours (q6h) for 2 doses on day 2 or at 24 and 30 hours after each IT administration. Patients should proceed to the next cycle when CNS 1 and no testicular disease is present, no sooner than Day 8 and no later than Day 15. PRE-IMMUNOTHERAPY TREATMENT FOR CNS 2/3 DISEASE (CLOSED TO ACCRUAL 9/19/2024 EXCEPT FOR ARM G): Patients receive MTX IT or cytarabine IT twice weekly (Q2W) for 5-7 doses or Intrathecal Triple Therapy (ITT) IT Q2W for 3-4 doses until patient is CNS 1. Patients with DS also receive leucovorin calcium PO or IV q6h for 2 doses at 24 and 30 hours after each IT administration. Patients should proceed to the next cycle when CNS 1 and no testicular disease is present, no sooner than Day 15 and no later than Day 24. PRE-IMMUNOTHERAPY TREATMENT FOR TESTICULAR DISEASE(CLOSED TO ACCRUAL 9/19/2024 EXCEPT FOR ARM G): Patients receive MTX IT, cytarabine IT, or ITT IT on days 1 and 15 (day 1 may be omitted if intrathecal therapy is given with relapse diagnostic LP \< 7 days prior to the start of protocol therapy). Patients with DS also receive leucovorin calcium PO or IV q6h for 2 doses on days 2 and 16 or at 24 and 30 hours after each IT administration. Males with testicular disease at relapse undergo radiation once daily (QD) for a total of 12 fractions over 12 days. Patients should proceed to the next cycle when CNS 1 and no testicular disease is present, no sooner than Day 15 and no later than Day 22. GROUP 1 (CLOSED TO ACCRUAL 9/19/2024): Patients are randomized to Arm A or Arm B. ARM A: Patients receive dexamethasone PO or IV on days 1 and 8 of cycle 1, blinatumomab via continuous IV infusion on days 1-28 of cycles 1-2, MTX IT, cytarabine IT, or ITT IT on days 1, 15, and 36 of cycle 1 (MTX, cytarabine, and ITT on day 1 may be omitted if intrathecal therapy was given \< 7 days prior to the start of this cycle), and MTX IT, cytarabine IT, or ITT IT on days 15 and 36 of cycle 2. Treatment repeats every 36 days for 2 cycles in the absence of disease progression or unacceptable toxicity. NOTE: Patients with MRD \< 0.01% after cycle 1 may stop study treatment or may choose to continue to cycle 2. Patients with MRD \>= 0.01% after cycle 1 proceed to cycle 2. ARM B: Patients receive dexamethasone, blinatumomab, and MTX, cytarabine, or ITT as in Arm A. Patients also receive nivolumab IV over 30 minutes on days 11 and 25 of cycle 1 and days 1 and 15 of cycle 2. Treatment repeats every 36 days for 2 cycles in the absence of disease progression or unacceptable toxicity. NOTE: Patients with MRD \< 0.01% after cycle 1 may stop study treatment or may choose to continue to cycle 2. Patients with MRD \>= 0.01% after cycle 1 proceed to cycle 2. GROUPS 2-4 VXLD REINDUCTION: Patients receive vincristine sulfate via infusion or IV push over 1 minute on days 1, 8, 15, and 22, dexamethasone PO or IV on days 1-14, doxorubicin hydrochloride IV over 1-15 minutes on day 1, MTX IT on days 1, 8, and 29 (day 1 IT may be omitted if intrathecal therapy is given with relapse diagnostic LP \< 7 days prior to the start of this cycle) (days 8 and 29 for CNS 1 patients at relapse only), pegaspargase intramuscularly (IM) or IV over 1-2 hours on days 2 and 16 or calaspargase IV over 1-2 hours on day 2 (for patients ≤ 22 years), cytarabine IT on days 4 and 11 (CNS 2 patients at relapse only), then Q2W until 3 consecutive samples are clear of blasts, and ITT IT on days 8, 15, 22, and 29 (CNS 3 patients at relapse only). Treatment continues in the absence of disease progression or unacceptable toxicity. GROUP 2 (CLOSED TO ACCRUAL 9/19/2024): The following patients are randomized to Arm C or Arm D: 1) \>= 1 to \< 31 years old, IEM relapse \< 18 months from diagnosis, regardless of MRD after Re-Induction. 2) \< 18 years old with marrow relapse \>= 24 to \< 36 months from diagnosis regardless of MRD after Re-Induction, 3) \>= 1 to \< 31 years old, IEM relapse \>= 18 months, and MRD \>= 0.1% after Re-Induction, 4) \< 18 years old with marrow relapse \>= 36 months, and MRD \>= 0.1% after Re-Induction. ARM C: Patients receive dexamethasone PO or IV on day 1 of cycle 1, blinatumomab via continuous IV infusion on days 1-28 of cycles 1 and 2, and MTX IT on days 1 and 15 of cycles 1 and 2 (day 1 may be omitted from cycle 1 if intrathecal MTX is given \< 7 days prior to the start of cycle 1 ). Treatment repeats every 36 days for 2 cycles in the absence of disease progression or unacceptable toxicity. NOTE: Patients with MRD \< 0.01% after cycle 1 may stop study treatment or may choose to continue to cycle 2. Patients with MRD \>= 0.01% after cycle 1 proceed to cycle 2. ARM D: Patients receive dexamethasone, blinatumomab, and MTX as in Arm C. Patients also receive nivolumab IV over 30 minutes on days 11 and 25 of cycle 1 and days 1 and 15 of cycle 2. Treatment repeats every 36 days for 2 cycles in the absence of disease progression or unacceptable toxicity. NOTE: Patients with MRD \< 0.01% after cycle 1 may stop study treatment or may choose to continue to cycle 2. Patients with MRD \>= 0.01% after cycle 1 proceed to cycle 2. GROUP 3: Patients are randomized to Arm E or Arm F. ARM E: IMMUNOTHERAPY CYCLES 1-2: Patients receive dexamethasone PO or IV on day 1 of cycle 1 only, blinatumomab IV via continuous infusion on days 1-28, and MTX IT on days 1 and 15 (day 1 may be omitted from cycle 1 if intrathecal therapy is given \< 7 days prior to the start of this cycle). Immunotherapy cycles 1-2 alternate with Consolidation cycles 1-2. CONSOLIDATION: Patients receive dexamethasone PO or IV on days 1-5, methotrexate IV, over 24 hours, on days 8 and 22, methotrexate IT on days 8 and 22 (CNS 1/2 at relapse only) or ITT IT on days 8 and 22 (CNS 3 at relapse only). INTENSIFICATION CYCLES 1-2: Patients receive dexamethasone PO on days 1-5, vincristine sulfate IV push over 1 minute or via infusion on day 1, mercaptopurine PO on days 1-42, methotrexate IV over 24 hours on days 8 and 22, cytarabine IV, over 3 hours on days 43 and 44, asparaginase erwinia recombinant IM or crisantaspase/asparaginase erwinia IM or IV over 1-2 hours on day 44, methotrexate IT on days 1 and 43 (CNS 1/2 at relapse only) or ITT IT on days 1 and 43 (CNS 3 at relapse only). IMMUNOTHERAPY CYCLE 3: Patients receive blinatumomab IV via continuous infusion on days 1-28, and MTX IT on days 1 and 15 (CNS 1/2 at relapse only) or ITT IT on days 1 and 15 (CNS 3 at relapse only). MAINTENANCE: Patients receive dexamethasone PO BID on days 1-5, 29-33, and 57-61, vincristine sulfate IV push over 1 minute or via infusion on days 1, 29, and 57, mercaptopurine PO on days 1-84, MTX IT on day 1 (CNS 1/2 patients at relapse only), ITT IT on day 1 (CNS 3 patients at relapse only), and MTX PO on days 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, and 78. Treatment repeats every 12 weeks for 2 years from the start of Re-Induction therapy in the absence of disease progression or unacceptable toxicity. MAINTENANCE CHEMORADIATION (FOR CNS 3 PATIENTS ONLY): Beginning between the first and second cycles of maintenance therapy, patients receive dexamethasone PO BID on days 1-7 and 15-21, vincristine sulfate IV push over 1 minute or via infusion on days 1, 8, and 15, and pegaspargase IM or IV over 1-2 hours or calaspargase IV over 1-2 hours on day 1. Patients with CNS 3 and isolated CNS relapse undergo cranial radiation in the form of 3-dimensional (D)-conformal radiation therapy (CRT) over 5 days per week for a total of 10 treatments. ARM F: IMMUNOTHERAPY CYCLES 1-2: Patients receive dexamethasone PO or IV on day 1 of cycle 1 only, blinatumomab IV via continuous infusion on days 1-28, nivolumab IV over 30 minutes on days 11 of cycle 1 and on days 1 of cycles 2 and 3, and MTX IT on days 1 and 15 (CNS 1/2 patients at relapse only)(day 1 may be omitted from cycle 1 if intrathecal therapy is given with \< 7 days prior to the start of this cycle) or , ITT IT on day 1 (CNS 3 patients at relapse only) (day 1 may be omitted from cycle 1 if intrathecal therapy is given with \< 7 days prior to the start of this cycle). Immunotherapy cycles 1-2 alternate with Consolidation cycles 1-2. CONSOLIDATION CYCLES 1-2: Patients receive dexamethasone PO on days 1-5, vincristine sulfate IV push over 1 minute or via infusion on day 1, methotrexate IV, over 24 hours, on days 8 and 22, methotrexate IT on days 8 and 22 (CNS 1/2 at relapse only) or ITT IT on days 8 and 22 (CNS 3 at relapse only). INTENSIFICATION CYCLES 1-2: Patients receive dexamethasone PO on days 1-5, vincristine sulfate IV push over 1 minute or via infusion on day 1, mercaptopurine PO on days 1-42, methotrexate IV over 24 hours on days 8 and 22, cytarabine IV, over 3 hours on days 43 and 44, asparaginase erwinia recombinant IM or crisantaspase/asparaginase erwinia IM or IV over 1-2 hours on day 44, methotrexate IT on days 1 and 43 (CNS 1/2 at relapse only) or ITT IT on days 1 and 43 (CNS 3 at relapse only). IMMUNOTHERAPY CYCLE 3: Patients receive blinatumomab IV via continuous infusion on days 1-28, nivolumab IV over 30 minutes on days 1 and 15 and MTX IT on days 1 and 15. MAINTENANCE: Patients receive dexamethasone PO BID on days 1-5, 29-33, and 57-61, vincristine sulfate IV push over 1 minute or via infusion on days 1, 29, and 57, mercaptopurine PO on days 1-84, MTX IT on day 1 (CNS 1/2 patients at relapse only), ITT IT on day 1 (CNS 3 patients at relapse only), and MTX PO on days 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78. Treatment repeats every 12 weeks for 2 years from the start of Re-Induction therapy in the absence of disease progression or unacceptable toxicity. MAINTENANCE CHEMORADIATION (FOR CNS 3 PATIENTS): Beginning between the first and second cycles of maintenance therapy, patients receive dexamethasone PO BID on days 1-7 and 15-21, vincristine sulfate IV push over 1 minute or via infusion on days 1, 8, and 15, and pegaspargase IM or IV over 1-2 hours or calaspargase IV over 1-2 hours on day 1. Patients with CNS 3 and isolated CNS relapse undergo cranial radiation in the form of 3-dimensional (D)-conformal radiation therapy (CRT) over 5 days per week for a total of 10 treatments. GROUP 4: Patients are randomized to arm H or arm I. ARM H: Patients receive dexamethasone PO or IV on day 1 and 8 of cycle 1 only, blinatumomab IV via continuous infusion on days 1-28 and MTX IT on days 1 of cycle 1 only and days 15 and 36 ( for patients with CNS1/2 at relapse only) or ITT on day 1 of cycle 1 only and days 15 and 36 (for patients with CNS 3 at relapse only) (day 1 IT therapy may be omitted from cycle 1 if intrathecal therapy is given with \< 7 days prior to the start of this cycle). Cycles repeat every 36 days for up to 2 cycles in the absence of disease progression or unacceptable toxicity. ARM I: Patients receive dexamethasone PO or IV on day 1 and 8 of cycle 1 only, blinatumomab IV via continuous infusion on days 1-28, nivolumab IV, over 30 minutes on day 11 of cycle 1 and day 3 of cycle 2 and MTX IT on days 1 of cycle 1 only and days 15 and 36 ( for patients with CNS 1/2 at relapse only) or ITT on day 1 of cycle 1 only and days 15 and 36 (for patients with CNS 3 at relapse only) (day 1 IT therapy may be omitted from cycle 1 if intrathecal therapy is given with \< 7 days prior to the start of this cycle). Cycles repeat every 36 days for up to 2 cycles in the absence of disease progression or unacceptable toxicity. ARM G (DS PATIENTS): Patients receive dexamethasone PO or IV on days 1 and 8 of cycle 1 only, blinatumomab IV via continuous infusion on days 1-28, nivolumab IV over 30 minutes on days 11 of cycle 1 and day 3 of cycle 2, and MTX IT (for patients with CNS 1/2 at relapse only) or ITT on day 1 of cycle 1 only and days 15 and 36 (for patients with CNS 3 at relapse only) (day 1 IT therapy may be omitted from cycle 1 if intrathecal therapy is given with \< 7 days prior to the start of this cycle). Cycles repeat every 37 days for up to 2 cycles in the absence of disease progression or unacceptable toxicity. Patients undergo lumbar puncture, bone marrow biopsy and aspiration, and collection of blood, urine and cerebrospinal fluid throughout the study. After completion of study treatment, patients are followed up every 3 months for 1 year.