A Study of JNJ-88549968 for the Treatment of Calreticulin (CALR)-Mutated Myeloproliferative Neoplasms

Condition(s) studied

Investigational drug(s) / intervention(s)

JNJ-88549968: JNJ-88549968 will be administered.

Ruxolitinib: For US sites: Ruxolitinib will be administered for participants with MF only.

Momelotinib: For US sites: Momelotinib will be administered for participants with MF only.

Study summary

The purpose of this study is to characterize safety and to determine the Recommended Phase 2 Dose (RP2D\[s\]) and optimal dosing schedule(s) of JNJ-88549968 in part 1 (Dose Escalation); to characterize the safety of JNJ- 88549968 at RP2D(s) in part 2 (Cohort Expansion). For U.S. sites: the purpose of this study is to characterize the safety and to determine the RP2D(s) and optimal dosing schedule(s) of JNJ-88549968 in Part 1 and part 1b (Dose Escalation), and to characterize the safety of JNJ-88549968 at the RP2D(s) in Part 2 and part 2b (Cohort Expansion), when given as monotherapy in essential thrombocythemia (ET) or myelofibrosis (MF), and with ruxolitinib or momelotinib in MF only.

Eligibility

Primary outcome measure(s)

• Part 1, Part 1b (US Only): Number of Participants With Dose Limiting Toxicity (DLT) — Approximately up to 35 days after first dose of study treatment
  Number of participants with DLT will be reported. The DLTs are specific adverse events and are defined as any of the following: high grade non-hematologic toxicity, or hematologic toxicity. For US only: A DLT is any adverse event attributed to study treatment that meets the criteria for severity and duration and that occurs during the evaluation periods unless it can be incontrovertibly attributed to disease or other extraneous cause such as an accident.
• Part 1, 2, Part 1b (US Only), Part 2b (US Only): Number of Participants with Adverse Events (AEs) — Up to 2 years
  An AE is any untoward medical occurrence in a participant participating in a clinical study that does not necessarily have a causal relationship with the pharmaceutical/biological agent under study.
• Part 1, 2, Part 1b (US Only), Part 2b (US Only): Number of Participants with Adverse Events (AEs) by Severity — Up to 2 years
  An adverse event is any untoward medical occurrence in a clinical study participant that does not necessarily have a causal relationship with the pharmaceutical/biological agent under study. Severity will be graded according to the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI-CTCAE) version 5.0. Severity scale ranges from grade 1 (mild) to grade 5 (death). Grade 1= mild, Grade 2= moderate, Grade 3= severe, Grade 4= life-threatening and Grade 5= death related to adverse event. Cytokine release syndrome (CRS) and associated neurologic toxicity events (immune effector cell-associated neurotoxicity syndrome events \[ICANS\]) will be graded according to the American Society for Transplantation and Cellular Therapy (ASTCT) guidelines.

Trial sites (44)

+ 4 more sites — see the full list on the official registry below.

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