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. 2020 Mar 22;9(1):1738814.
doi: 10.1080/2162402X.2020.1738814.

Response and survival of metastatic melanoma patients treated with immune checkpoint inhibition for recurrent disease on adjuvant dendritic cell vaccination

Affiliations

Response and survival of metastatic melanoma patients treated with immune checkpoint inhibition for recurrent disease on adjuvant dendritic cell vaccination

Wouter W van Willigen et al. Oncoimmunology. .

Abstract

Vaccination with autologous dendritic cells (DC) loaded ex vivo with melanoma-associated antigens is currently being tested as an adjuvant treatment modality for resected locoregional metastatic (stage III) melanoma. Based on its mechanism of action, DC vaccination might potentiate the clinical efficacy of concurrent or sequential immune checkpoint inhibition (ICI). The purpose of this study was to determine the efficacy of ICI administered following recurrent disease during, or after, adjuvant DC vaccination. To this end, we retrospectively analyzed clinical responses of 51 melanoma patients with either irresectable stage III or stage IV disease treated with first- or second-line ICI following recurrence on adjuvant DC vaccination. Patients were analyzed according to the form of ICI administered: PD-1 inhibition monotherapy (nivolumab or pembrolizumab), ipilimumab monotherapy or combined treatment with ipilimumab and nivolumab. Treatment with first- or second-line PD-1 inhibition monotherapy after recurrence on adjuvant DC vaccination resulted in a response rate of 52%. In patients treated with ipilimumab monotherapy and ipilimumab-nivolumab response rates were 35% and 75%, respectively. In conclusion, ICI is effective in melanoma patients with recurrent disease on adjuvant DC vaccination.

Keywords: Melanoma; adjuvant; dendritic cell; immunotherapy; vaccination.

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Figures

Figure 1.
Figure 1.
First- and second-line treatment in metastatic melanoma patients following recurrent disease on adjuvant dendritic cell vaccination. First- and second-line treatment is shown for the patients in the three different treatment groups. Three patients received first-line PD-1 inhibition monotherapy followed by second-line ipilimumab monotherapy, another three patients were treated with first-line ipilimumab monotherapy after which they received second-line PD-1 inhibition monotherapy. These six patients were analyzed in both the PD-1 inhibition monotherapy group (red) and the ipilimumab monotherapy group (blue). Therefore, the three treatment groups combined consisted of 57 analyzed patients
Figure 2.
Figure 2.
Progression-free and overall survival of patients treated with immune checkpoint inhibition following recurrence on adjuvant dendritic cell vaccination. Kaplan–Meier curves showing the progression-free and overall survival following PD-1 inhibition monotherapy (panels a, b); ipilimumab monotherapy (panels c, d) and ipilimumab-nivolumab (panels e, f) after recurrence on adjuvant DC vaccination. Survival data of first- and second-line therapy combined are shown in these panels

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