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S. Pattison



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    ORAL 26 - Clinical Trials 2 (ID 127)

    • Event: WCLC 2015
    • Type: Oral Session
    • Track: Thymoma, Mesothelioma and Other Thoracic Malignancies
    • Presentations: 1
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      ORAL26.07 - Early Signs of Clinical Activity of a MicroRNA-Based Therapy in a Phase I Study in Recurrent Malignant Pleural Mesothelioma (ID 1101)

      11:50 - 12:01  |  Author(s): S. Pattison

      • Abstract
      • Presentation
      • Slides

      Background:
      Recently we demonstrated that members of the miR-15/16 family of microRNAs are implicated as tumor suppressors in malignant pleural mesothelioma (MPM) (Reid et al, Ann Oncol, 2013). MesomiR 1 is a first-in-man study testing TargomiRs (miR-15/16-derived mimics packaged in EDV[TM]nanocells [EDVs] targeted with EGFR antibodies) in MPM patients.

      Methods:
      In this phase I study (ClinicalTrials.gov: NCT02369198) a standard 3-6 patient dose escalation cohort design examining weekly/twice weekly administration of TargomiRs is followed. Patients tolerating weekly/twice weekly TargomiR infusions well are allowed to continue experimental therapy for at least 8 weeks. Fifty percent of the MTD previously established for EDVs was chosen as the first dose level to be studied and corresponded to 5 billion EDVs containing 1.5 μg miR-15/16 mimics. Based on prior experience with EDVs, patients who presented with elevated IL-6 levels were given a dose adaptation period of two weeks before receiving phase I doses. Premedication consisted of dexamethasone, promethazine and paracetamol and patients were monitored for a minimum period of 3 hours after TargomiR infusion. Response assessment (CT, FDG-PET, pulmonary function) was scheduled for patients completing 8 weeks of treatment. Quality-of-Life (QoL) questionnaires (EORTC) were requested on a weekly basis.

      Results:
      Ten MPM patients have enrolled to date. The majority of patients receiving 5 billion TargomiRs experienced a period of shivering/rigor 80-90 minutes after the start of the infusion, sometimes associated with burning/painful sensations in the area of disease. Overall TargomiR treatment was well tolerated and no patient failed to complete the first (8 weeks) treatment period. Laboratory examination revealed a steep but transitory rise in inflammatory cytokines, neutrophilia and lymphopenia shortly after TargomiR infusion, sometimes accompanied by mild elevation of liver enzymes. QoL assessment (9 patients) showed improving scores in 3 patients, stabilization in 4 and slightly lower scores in 2 patients. Response assessment (modified RECIST) in the 6 patients completing 8 weeks of treatment to date: 1 PR (see Figure 1, reconfirmed after 12 and 16 weeks), 4 SD and 1 PD. Figure 1. FDG-PET scintigraphy before (left) and after (right) 8 weeksFigure 1 of TargomiR treatment (patient 5)



      Conclusion:
      Early MesomiR 1 data revealed that infusions with 5 billion TargomiRs were well tolerated. Transient inflammatory (cytokine-mediated) reactions were noted shortly after TargomiR administration. One objective response was recorded while stable disease and stable QoL scores were noted in the majority of patients completing 8 weeks of experimental treatment.

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