Summary
This study will evaluate whether treatment with chemotherapy (azacitidine and carboplatin) enhances the immune response to immunotherapy rechallenge (with ipilimumab and nivolumab) in people with unresectable (which means unable to be removed by surgery) or metastatic melanoma who have been unresponsive to preivous CPI immunotherapy treatment that consisted of anti-PD1 and anti-CTLA4 antibodies.
It is hoped that data from thsi trial will help investigators understanding the tumour microenvironment of treatment-resistant metastatic melanoma.
What treatment is involved?
Eligible participants will receive the following treatment during Stage 1 of the study.
Cycles 1 & 2 - oral Azacitidine (200mg or 300mg) daily on days 1-14 and intravenous injection (IVI) Carboplatin AUC 4.5 on day 8 or day 15 over 6 weeks, followed by
Cycles 3 & 4 - oral Azacitidine (200mg or 300mg) daily on days 1-14 and IVI Carboplatin AUC 4.5 on day 8 or day 15 with Ipilimumab injection (1mg/kg) and Nivolumab injection (360mg) on day 15 for 6 weeks.
Cycles 5 & 6 - Ipilimumab injection (1mg/kg) and Nivolumab injection (360mg) will be given in combination on day 1 of 21 day cycles.
Ipilimumab and Nivolumab will continue every 6 weeks as maintenance therapy for 24 months or until disease progression, unless the treating clinician believes there is benefit with ocntinuing treatment. Tissue samples, disease progression rates and adverse events will be collected from participants.
Stage 2 (Phase II): participants will receive epigenetic and chemotherapy priming at the Recommended Phase 2 Dose (RP2D) from Stage 1 of 40mg/m2 Azacitidine IVI.
Cycles 1 & 2 - Azacitidine (40mg/m2 intravenous injection (IVI)) daily on days 1-5 and IVI Carboplatin AUC 4.5 on day 8 over 6 weeks followed by
Cycles 3 & 4 - Azacitidine (40mg/m2) daily on days 1-5 and IVI Carboplatin AUC 4.5 on day 8 with Ipilimumab injection (1mg/kg) and Nivolumab injection (360mg) on day 15 for 6 weeks.
Cycles 5 & 6 - Ipilimumab injection (1mg/kg) and Nivolumab injection (360mg) will be given in combination on day 1 of 21 day cycles.
Ipilimumab (every 6 weeks) and Nivolumab (every 3 weeks) will continue as maintenance therapy for 24 months or until disease progression, unless the clinician believes that there is a clinical benefit to continue treatment.