Dose Escalation will employ a traditional 3 + 3 design to assess safety of VT3989 in patients with refractory metastatic solid tumors or mesothelioma until until the MTD or recommended phase 2 dose(s) and schedule(s) are determined. The recommended phase 2 dose(s) and schedule(s) may be less than the MTD depending on the type and severity of AEs that occur during and after the first cycle.~Dose Expansion patients will be enrolled into up to 4 cohorts: Cohorts 1 and 2 will both enroll mesothelioma patients with or without an NF2 mutation that have progressed following standard therapy. The cohorts will differ by either the dose and/or schedule of VT3989, as recommended by the SRC. If a 3rd expansion cohort for mesothelioma patients is enrolled, it will employ a different regimen than the initial 2 expansion cohorts. If an NF2m solid tumor cohort is evaluated, it will use one of the regimens evaluated in the mesothelioma expansion cohorts.
This is an open-label, dose escalation and expansion study to evaluate the safety, tolerability, PK, and biological activity of VT3989 administered in patients with mesothelioma and/or metastatic solid tumors that are resistant or refractory to standard therapy or for which no effective standard therapy is available.