PMID- 31326409 OWN - NLM STAT- MEDLINE DCOM- 20200814 LR - 20200814 IS - 2152-2669 (Electronic) IS - 2152-2669 (Linking) VI - 19 IP - 9 DP - 2019 Sep TI - Oprozomib, pomalidomide, and Dexamethasone in Patients With Relapsed and/or Refractory Multiple Myeloma. PG - 570-578.e1 LID - S2152-2650(19)30108-9 [pii] LID - 10.1016/j.clml.2019.05.017 [doi] AB - INTRODUCTION: This phase Ib study evaluated oprozomib, an oral proteasome inhibitor, plus pomalidomide-dexamethasone in relapsed/refractory multiple myeloma (RRMM). PATIENTS AND METHODS: Patients received oprozomib once-daily on days 1 to 5 and 15 to 19 (5/14 schedule; 150 mg/day starting dose) or on 2 consecutive days weekly (2/7 schedule; 210 mg/day starting dose) of 28-day cycles, pomalidomide on days 1 to 21 (4 mg/day starting dose), and dexamethasone 20 mg on 2 consecutive days weekly. A 3 + 3 dose-escalation schema was used to determine the maximum tolerated dose. RESULTS: Thirty-one patients were treated (5/14, n = 4; 2/7, n = 27). Oprozomib maximum tolerated dose was not defined. The 2/7 schedule (oprozomib 210 mg/day, pomalidomide 4 mg/day) was selected for dose expansion based on overall safety (n = 17). In this group, the most common adverse events (AEs) were gastrointestinal (diarrhea [88.2%], nausea [58.8%], and vomiting [58.8%]); grade >/= 3 gastrointestinal AEs were uncommon. The most common grade >/= 3 AEs were hematologic (anemia [47.1%], neutropenia [35.3%], and thrombocytopenia [29.4%]). One dose-limiting toxicity (gastric hemorrhage) occurred; 3 patients discontinued owing to AEs. The overall response rate was 70.6%. CONCLUSION: Safety and pharmacokinetic profiles were concerns with the oprozomib formulation used in this study and need to be improved. Oprozomib-pomalidomide-dexamethasone (2/7 schedule) had encouraging efficacy, supporting an ongoing phase Ib study evaluating new oprozomib formulations for this combination in relapsed/refractory multiple myeloma. CI - Copyright (c) 2019. Published by Elsevier Inc. FAU - Shah, Jatin AU - Shah J AD - The University of Texas MD Anderson Cancer Center, Houston, TX. Electronic address: jatinshahmd@outlook.com. FAU - Usmani, Saad AU - Usmani S AD - Levine Cancer Institute/Carolinas Healthcare System, Charlotte, NC. Electronic address: Saad.Usmani@carolinashealthcare.org. FAU - Stadtmauer, Edward A AU - Stadtmauer EA AD - Abramson Cancer Center, University of Pennsylvania, Philadelphia, PA. FAU - Rifkin, Robert M AU - Rifkin RM AD - US Oncology Research and Rocky Mountain Cancer Centers, Denver, CO. FAU - Berenson, James R AU - Berenson JR AD - Institute for Myeloma and Bone Cancer Research, West Hollywood, CA. FAU - Berdeja, Jesus G AU - Berdeja JG AD - Sarah Cannon Research Institute, Nashville, TN. FAU - Lyons, Roger M AU - Lyons RM AD - US Oncology Research and Texas Oncology, San Antonio, TX. FAU - Klippel, Zandra AU - Klippel Z AD - Onyx Pharmaceuticals, Inc., an Amgen subsidiary, South San Francisco, CA. FAU - Chang, Yu-Lin AU - Chang YL AD - Onyx Pharmaceuticals, Inc., an Amgen subsidiary, South San Francisco, CA. FAU - Niesvizky, Ruben AU - Niesvizky R AD - Weill Cornell Medical College/New York Presbyterian Hospital, New York, NY. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20190529 PL - United States TA - Clin Lymphoma Myeloma Leuk JT - Clinical lymphoma, myeloma & leukemia JID - 101525386 RN - 0 (ONX 0912) RN - 0 (Oligopeptides) RN - 4Z8R6ORS6L (Thalidomide) RN - 7S5I7G3JQL (Dexamethasone) RN - D2UX06XLB5 (pomalidomide) SB - IM MH - Adult MH - Aged MH - Antineoplastic Combined Chemotherapy Protocols/adverse effects/*therapeutic use MH - Dexamethasone/administration & dosage/pharmacokinetics MH - Drug Administration Schedule MH - Drug Resistance, Neoplasm MH - Female MH - Humans MH - Male MH - Middle Aged MH - Multiple Myeloma/diagnosis/*drug therapy/mortality MH - Neoplasm Recurrence, Local MH - Neoplasm Staging MH - Oligopeptides/administration & dosage/pharmacokinetics MH - Research Design MH - Retreatment MH - Thalidomide/administration & dosage/analogs & derivatives/pharmacokinetics OTO - NOTNLM OT - Clinical trials OT - Oncology OT - Pharmacokinetics OT - Proteasome inhibitor OT - Therapy EDAT- 2019/07/22 06:00 MHDA- 2020/08/15 06:00 CRDT- 2019/07/22 06:00 PHST- 2019/01/31 00:00 [received] PHST- 2019/04/25 00:00 [revised] PHST- 2019/05/26 00:00 [accepted] PHST- 2019/07/22 06:00 [pubmed] PHST- 2020/08/15 06:00 [medline] PHST- 2019/07/22 06:00 [entrez] AID - S2152-2650(19)30108-9 [pii] AID - 10.1016/j.clml.2019.05.017 [doi] PST - ppublish SO - Clin Lymphoma Myeloma Leuk. 2019 Sep;19(9):570-578.e1. doi: 10.1016/j.clml.2019.05.017. Epub 2019 May 29.