A Phase 1/2a Dose-Finding Study of PT-112 in Patients With Relapsed or Refractory Multiple Myeloma

Study PT-112-102, a multicenter, open-label dose-finding and pharmacokinetic study of PT-112 in patients with relapsed or refractory multiple myeloma.

This is designed as a two-part study. In the first part of the study, cohorts of three patients (expanded to six patients in the event of a dose-limiting toxicity) will receive escalating doses of PT-112 until the MTD is reached, based on tolerability observed during the first 28 days of treatment. In the second part of the study, an expansion cohort of 14 patients will be treated at the recommended dose to confirm the tolerability of treatment and evaluate evidence of treatment efficacy.

Study Overview

• Status: Completed
• Conditions: Multiple Myeloma
• Intervention / Treatment: Drug: PT-112

• Study Type: Interventional
• Enrollment (Actual): 24
• Phase: Phase 1

Contacts and Locations

Study Locations

• United States
  • Arizona
    • Phoenix, Arizona, United States, 85054
      • Mayo Clinic Cancer Center
  • Colorado
    • Denver, Colorado, United States, 80220
      • Rocky Mountain Cancer Centers
  • Florida
    • Jacksonville, Florida, United States, 32224
      • Mayo Clinic Cancer Center
  • Minnesota
    • Rochester, Minnesota, United States, 55905
      • Mayo Clinic Cancer Center
  • New Jersey
    • New Brunswick, New Jersey, United States, 08903
      • Rutgers Cancer Institute of New Jersey
  • Pennsylvania
    • Philadelphia, Pennsylvania, United States, 19104
      • University of Pennsylvania
  • Texas
    • San Antonio, Texas, United States, 78240
      • Texas Oncology San Antonio Medical Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Key Inclusion Criteria:

1. Previously diagnosed with MM requiring treatment based on IMWG diagnostic criteria;
2. Relapsed or refractory MM after adequate exposure to and therapeutic response (following IMWG response criteria) to at least one line of treatment with one or more active agents, including alkylating drugs, corticosteroids, immunomodulatory drugs (IMiD: thalidomide, lenalidomide, pomalidomide), proteasome inhibitors (bortezomib, cartilzomib), and monoclonal antibodies (daratumumab, elotuzumab, ixazomab);
3. Evaluable MM with at least one of the following: (a) serum monoclonal component ≥ 0.5 g/dL; or (b) Bence Jones (BJ) proteinuria ≥ 200 mg/24h; or (c) measurable plasmacytoma (not previously irradiated); or (d) involved serum free light chain ≥ 10 mg/dL with an abnormal free light chain ratio;
4. ECOG Performance Status (PS) 0-2;
5. Life expectancy > 3 months;
6. At least 2 weeks (or 5 half-lives, whichever is longer) wash-out since the end of previously administered experimental therapy (6 weeks if previous nitrosourea containing regimen) or 2 weeks for standard-of-care regimens. Concurrent corticosteroids are allowed provided they are administered at an equivalent prednisone dose of ≤ 10 mg/day, as prediction or blood products only;
7. Recovery from non-hematologic toxic effects of prior therapy to grade ≤ 1 (except alopecia) by NCI CTCAE Version 4.03;
8. Adequate bone marrow (BM), renal, hepatic and metabolic function.

Key Exclusion Criteria:

1. Any of the following concomitant diseases/conditions:

   • History or presence of myocardial infarction, clinically relevant valvular heart disease, or congestive heart failure within the last 12 months;
   • Unstable cardiac dysrhythmias or persistent prolongation of the corrected QT interval (QTc) (Fridericia) to >480 msec for males or >500 msec for females, based on ECG at screening (patients with stable atrial fibrillation on treatment are allowed provided they do not meet any other cardiac or prohibited drug exclusion criterion);
   • Presence of current angina;
   • Active uncontrolled infection;
   • Morphological or cytological features of myelodysplasia and/or post-chemotherapy aplasia on BM assessment;
   • Myopathy > grade 2 or any clinical situation that causes significant and persistent elevation of CPK (>2.5 x ULN in two different determinations performed one week apart);
   • Peripheral neuropathy > grade 1, except for grade 2 without limitations on instrumental daily life activities;
   • POEMS syndrome or active plasma cell leukemia;
   • Chronic graft versus host disease (GVHD) or on immunosuppressive therapy for the control of GVHD;
   • History or presence within the last 3 months of Deep Vein Thrombosis (DVT) or a pulmonary embolism (PE);- Uncontrolled leptomeningeal disease;
   • Uncontrolled disease-related metabolic disorder (e.g., hypercalcemia);
   • Acute or chronic infections requiring systemic therapy, including, among others:
   • active infection requiring systemic therapy;
   • history of testing positive to human immunodeficiency virus (HIV) or known acquired immunodeficiency syndrome;
   • hepatitis B virus (HBV) or hepatitis C virus (HCV) infection at screening (positive HBV surface antigen or HCV RNA if anti-HCV antibody screening test is positive);
   • active tuberculosis (history of exposure or history of positive TB test with presence of clinical symptoms, physical or radiographic finding);
   • Any other major illness that, in the Investigator's judgment, may substantially increase the risk associated with the patient's participation in this study;
2. History of prior malignancy other than those previously treated with a curative intent more than 5 years ago and without relapse (any tumor) or basal cell skin cancer, in situ cervical cancer, superficial bladder cancer, or high grade intestinal polyps treated adequately, regardless of the disease-free interval;
3. Prior irradiation to > 30% of BM reserves (including total body irradiation), regardless of the washout period;
4. High dose chemotherapy followed by autologous stem cell transplantation within 90 days prior to initiating study treatment;
5. Bisphosphonate treatment within 7 days prior to initiating study treatment (while on study, bisphosphonates can be administered only once a month, between Days 18 to 21 of the 28-day treatment cycle)

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Other: PT-112; This is a single arm study of PT-112, which is administered to patients with relapsed or refractory MM	Drug: PT-112; This is a single arm study

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Recommended dose (RD) of PT-112 for further studies in patients with relapsed or refractory multiple myeloma (MM)	18 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Duration of response		18 months
Progression free survival		18 months
Peak Plasma Concentration (Cmax)		18 months
Area under the plasma concentration versus time curve (AUC)		18 months
Dose-limiting toxicities (DLTs)		18 months
Number of patients with Adverse Events (AEs)	Characterization of the type, incidence, severity, duration, reversibility and relationship to treatment of adverse events (AEs), and effects on vital signs and laboratory parameters.	18 months
Tumor response, including assessment of minimal residual disease, according to the International Myeloma Working Group (IMWG) response criteria		18 months
Relationship between sensitivity/response to treatment and disease status including cytogenetic biomarkers		18 months

Collaborators and Investigators

• Sponsor: Promontory Therapeutics Inc.
• Investigators: Principal Investigator: Leif Bergsagel, MD, Mayo Clinic

Study record dates

Study Major Dates

• Study Start (Actual): December 15, 2017
• Primary Completion (Actual): September 30, 2020
• Study Completion (Actual): March 1, 2021

Study Registration Dates

• First Submitted: September 11, 2017
• First Submitted That Met QC Criteria: September 18, 2017
• First Posted (Actual): September 20, 2017

Study Record Updates

• Last Update Posted (Actual): April 26, 2022
• Last Update Submitted That Met QC Criteria: April 19, 2022
• Last Verified: April 1, 2022

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Cardiovascular Diseases; Vascular Diseases; Immune System Diseases; Neoplasms by Histologic Type; Neoplasms; Lymphoproliferative Disorders; Immunoproliferative Disorders; Hematologic Diseases; Hemorrhagic Disorders; Hemostatic Disorders; Paraproteinemias; Blood Protein Disorders; Multiple Myeloma; Neoplasms, Plasma Cell
• Other Study ID Numbers: PT-112-102

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: UNDECIDED

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No