Therapy for Newly Diagnosed Patients With B-Cell Precursor Acute Lymphoblastic Leukemia and Lymphoma

This study utilizes a single arm phase II design. Treatment will consist of 3 main phases: Induction, early post induction [including Consolidation, Blinatumomab 1, High-Dose Methotrexate, Reinduction, Interim, Reconsolidation, and Blinatumomab 2], and Maintenance.

Induction:

• Induction includes 7 days of therapy on the INITIALL classification protocol (NCT06289673) as well as 5 further weeks of treatment on this trial. Treatment includes 15 days of oral (PO) or intravenous (IV) dexamethasone, 3 weekly doses of vincristine IV, and 2 doses of inotuzumab IV on Days 2 and 8. Patients will then receive blinatumomab IV from Days 9-36. Dasatinib PO will be added beginning on Day 12 for patients with an ABL-class fusion including patients with Ph+ ALL. These patients will also receive dasatinib in all subsequent cycles of therapy. Intrathecal (IT) MHA will be given. Patients will have a week without chemotherapy at the end of Induction, although patients with Induction failure (MRD ≥5% disease) will proceed directly to consolidation. Patients unable to receive inotuzumab by day 3 receive cyclophosphamide IV on days 3-4.

Early Post Induction:

• Consolidation will be given following completion of Remission Induction Therapy. Patients receive cyclophosphamide intravenous (IV), cytarabine IV, inotuzumab IV, intrathecal (IT) MHA, and dasatinib PO for patients with ABL-class fusion. Patients will have a week without chemotherapy at the end of Consolidation.
• Blinatumomab 1 will be given with IT MHA for four weeks to all patients after recovery from Consolidation.
• High-dose Methotrexate will be given IV every two weeks for four cycles. Patients will also receive an IT MHA with each of the 2 week cycles and will take oral mercaptopurine continuously if tolerated.
• Reinduction will consist of dexamethasone for 7 days in the first and third week, 3 weekly doses of vincristine IV, 1 dose of daunorubicin IV, 1 dose of calaspargase IV, intrathecal (IT) MHA one dose, and dasatinib PO daily (for patients with ABL-class fusion).
• Interim includes mercaptopurine po daily for 6 weeks, dexamethasone for 1 week (5 days), daunorubicin and vincristine IV on day 1 of weeks 2 and 5, calaspargase IV on day 1 of weeks 1 and 4, IT MHA on day 1 of week 4 and dasatinib po daily for 6 weeks (for patients with ABL-class fusion). Patients will have a week without chemotherapy at the end of Interim Therapy. Patients with Down syndrome will not receive daunorubicin during this phase.
• Reconsolidation will repeat therapy given in Consolidation but replace the investigational inotuzumab with traditional mercaptopurine.
• Blinatumomab 2 will be given for four weeks to patients without clonal IgH rearrangements, those with end of Induction MRD, those in whom next-generation based sequencing MRD is unavailable, patients who did not receive blinatumomab during induction, or patients with Down syndrome after Reconsolidation.

Maintenance therapy follows Reconsolidation or Blinatumomab 2 (for those patients receiving this therapy) and includes 8 pulses of dexamethasone and vincristine given every 4 weeks, weekly methotrexate, daily mercaptopurine, intrathecal therapy, and dasatinib (for patients with ABL-class fusions). Maintenance therapy lasts a total of 80 weeks.

Duration of therapy is approximately 2¼ years. Follow-up is recommended until the patient is in remission for 10 years and is at least 18 years old.

Inclusion criteria

• Enrollment on INITIALL.
• Age 1-18.99 years at the time of enrollment on INITIALL.
• B-Acute lymphoblastic leukemia or lymphoblastic lymphoma.
• No prior chemotherapy excluding therapy given on or allowed by INITIALL.
• NCI high-risk (age 10 years or greater or presenting WBC count ≥50,000 cells/microL) or NCI standard-risk and a HR clinical feature as listed below:

• CNS3 disease (≥5 WBC/microL CSF with blasts present)
• Testicular involvement of leukemia
• Steroid pretreatment defined as >24 hours of therapy in the 14 days prior to enrollment on INITIALL if a preceding WBC to define NCI risk is unavailable
• For lymphoblastic lymphoma, Stage 3-4 disease OR Stage 1-2 disease in patient ages ≥10 years OR HR clinical feature as defined above.
• Adequate liver function defined as:

• Total bilirubin ≤ 1.5x the upper limit of normal for age and alanine transaminase (ALT) ≤ 5x the upper limit of normal for age. Patients with an elevated total bilirubin due to hemolysis are eligible if they have a direct bilirubin <1.5x the upper limit of normal.
• Adequate renal function defined as:

• Calculated glomerular filtration rate (GFR) ≥ 50 mL/min/1.73m^2 using the Bedside Schwartz equation OR creatinine below or equal to the maximum defined below:

• Age: 1 to <2 years; maximum serum creatinine (mg/dL): 0.6 (male and female)
• Age: 2 to <6 years; maximum serum creatinine (mg/dL): 0.8 (male and female)
• Age: 6 to <10 years; maximum serum creatinine (mg/dL): 1.0 (male and female)
• Age: 10 to <13 years; maximum serum creatinine (mg/dL): 1.2 (male and female)
• Age: 13 to <16 years; maximum serum creatinine (mg/dL): 1.5 (male); 1.4 (female)
• Age: ≥16 years; maximum serum creatinine (mg/dL): 1.7 (male); 1.4 (female)
• Eligibility for inclusion post-induction requires meeting the first 4 Inclusion criteria above AND:

• Treatment on SJALL23H for Induction OR
• Lymphoblastic lymphoma, initially treated on an SJALL protocol OR standard (non-protocol) therapy, without a complete response at the end of induction OR
• NCI-SR ALL at diagnosis and treated with an SJALL protocol OR standard (non-protocol) therapy who have

• Slow response to therapy (≥0.1% MRD at end of induction for patients with hyperdiploid ALL or ≥0.01% MRD at end of induction for others with ALL) OR
• HR genetics as defined in the protocol.
• These patients may receive no more than 2 weeks of post-induction therapy and should be transitioned to SJALL23H post-induction as soon as the qualifying genetic or MRD result is available.

Exclusion criteria

• Presence of ETV6::RUNX1 fusion unless also having a HR clinical feature OR slow response to induction therapy.
• History or presence of clinically relevant central nervous system (CNS) pathology or event such as epilepsy, childhood or adult non-febrile seizure, paresis, aphasia, stroke, severe brain injuries, dementia, Parkinson's disease, cerebellar disease, organic brain syndrome, or psychosis. History of simple febrile seizure during childhood and presence of CNS leukemia at diagnosis are not exclusions to participation.
• Active uncontrolled infection.
• Current active autoimmune disease or history of autoimmune disease with the potential for CNS involvement.
• History of venoocclusive disease/ sinusoidal obstructive syndrome.
• Unstable cardiac disease including QTc >500msec.
• Inability or unwillingness to give informed consent/ assent as applicable.
• Pregnant or lactating.
• For patients of reproductive potential, unwillingness to use effective contraception for the duration of protocol therapy.