Study of CM4620 to Reduce the Severity of Pancreatitis Due to Asparaginase

This is an open label safety and efficacy evaluation with comparison of toxicity to a historical control population (TOTXVI). There will be 3 cohorts of patients enrolled, and the dose for each cohort will be determined based on the toxicities experienced in the ongoing and prior cohorts.

An initial 9 patients (cohort 1) will be enrolled and will receive dose level 1 and monitored for toxicity. If the therapy is well tolerated, 6 patients (cohort 2) will be treated at dose level 2. Subsequent enrollment of 9 patients (cohort 3) will be at either dose level 1 or 2 based on tolerability. The keyboard design will be used to determine the dosing for cohorts 2 and 3. Additional patients will be enrolled at the recommended phase II dose (RP2D) until a total of 24 patients have been treated at that dose, including any treated during the dose-finding phase.

CM4620 will be given days 1-4 as an IV infusion beginning within 36 hours of the onset of acute pancreatitis associated abdominal pain and within 8 hours of enrollment. For patients with prior abdominal pain or in those unable to communicate the location/characteristic of their pain, a change in the characteristic of the pain or new enzyme elevation/imaging findings after previously normal studies will determine the timing of onset of pancreatitis.

Patients will be followed for about 4 months after treatment.

Inclusion criteria

• Acute pancreatitis with elevation of amylase OR lipase ≥ 3x the upper limit of normal AND at least 1 of: abdominal pain consistent with acute pancreatitis OR imaging findings consistent with acute pancreatitis.
• Receipt of any form of asparaginase within the prior 49 days.
• Patient with acute lymphoblastic leukemia/ lymphoma age < 22 years receiving therapy with curative intent.

Exclusion criteria

• Prior episode of pancreatitis.
• QTc at baseline > 450 msec.
• Creatinine > 3x the upper limit of normal for age or total bilirubin >3x the upper limit for normal for age without evidence of leukemic infiltrate or hemolysis.
• Receipt of another investigational agent within the prior 7 days.
• History of allergy to eggs or known hypersensitivity to any component of CM4620.
• Positive pregnancy test or breastfeeding. Females of childbearing potential must have a negative urine or serum pregnancy test prior to enrollment. Males and females of childbearing potential must agree to use effective contraception for at least twelve months following the completion of therapy.
• Inability or unwillingness of research participant or legal guardian/representative to give written informed consent.