SOLAR: Efficacy and Safety of Cobomarsen (MRG-106) vs. Active Comparator in Subjects With Mycosis Fungoides

Official Title

SOLAR: A Phase 2, Randomized, Open-label, Parallel-group, Active Comparator, Multi-centre Study to Investigate the Efficacy and Safety of Cobomarsen (MRG-106) in Subjects With Cutaneous T-Cell Lymphoma (CTCL), Mycosis Fungoides (MF) Subtype


The main objective of this clinical trial is to study the efficacy and safety of cobomarsen (also known as MRG-106) for the treatment of cutaneous T-cell lymphoma (CTCL), mycosis fungoides (MF) subtype. Cobomarsen is designed to inhibit the activity of a molecule called miR-155 that may be important to the growth and survival of MF cancer cells. The study will compare the effects of cobomarsen to vorinostat, a drug that has been approved for the treatment of CTCL in the United States, Canada, and Australia. Participants will be randomly assigned to receive either weekly doses of cobomarsen or daily doses of vorinostat. Participants will continue on their assigned treatment as long as their disease does not get worse or as long as they do not have unacceptable side effects. The effects of treatment will be measured based on changes in skin lesion severity, disease-associated symptoms, and quality of life, as well as the length of time that the subject's disease remains stable or improved, without evidence of disease progression. The safety and tolerability of cobomarsen will be assessed based on the frequency and severity of observed side effects. Participants assigned to receive vorinostat who experience progression of their disease during their participation in this study may have the option to be treated with cobomarsen in a separate clinical trial, if they meet the entry criteria for that study.

Trial Description

Primary Outcome:

  • Proportion of subjects achieving an objective response of at least 4 months duration (ORR4)
Secondary Outcome:
  • Progression-free survival
  • Pruritus Numerical Rating Scale
  • Skindex-29 Dermatological Survey
  • Pain Numerical Rating Scale
  • Duration of composite global response for responding subjects
  • Complete response rate
  • Skin disease severity based on modified Severity-weighted Assessment Tool (mSWAT)
  • Time to progression
  • Overall survival
  • Number of participants with treatment-related adverse events as assessed by CTCAE v5.0
  • Plasma concentration of cobomarsen
Study Design: Subjects will be randomly assigned in a 1:1 ratio to receive either cobomarsen or vorinostat. A total of 126 subjects (63 per arm) will be enrolled. Cobomarsen will be administered in the clinic by intravenous infusion on Days 1, 3, 5 and 8, and weekly thereafter. Vorinostat will be dispensed to study subjects and taken as a daily oral dose according to the manufacturer's labeled dosing instructions. Treatment will continue until the subject becomes intolerant, develops clinically significant side effects, progresses, or the trial is terminated.

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