Dendritic cell-based immunotherapy (DCVAC/OvCa) combined with second-line chemotherapy in platinum-sensitive ovarian cancer (SOV02): A randomized, open-label, phase 2 trial

September 16, 2021
Source: Gynecol Oncol. 2021 Sep;162(3):652-660. doi: 10.1016/j.ygyno.2021.07.003. Epub 2021 Jul 20.

Authors: David Cibula, Lukas Rob, Peter Mallmann, Pawel Knapp, Jaroslav Klat, Josef Chovanec, Lubos Minar, Bohuslav Melichar, Alexander Hein, Dariusz Kieszko, Marek Pluta, Jiri Spacek, Pavel Bartos, Pauline Wimberger, Radoslaw Madry, Janina Markowska, Joanna Streb, Petr Valha, Hariz Iskandar Bin Hassan, Ladislav Pecen, Lorenzo Galluzzi, Jitka Fucikova, Tereza Hrnciarova, Marek Hraska, Jirina Bartunkova, Radek Spisek.

Objective: DCVAC/OvCa is an active cellular immunotherapy designed to stimulate an immune response against ovarian cancer. We explored the safety and efficacy of DCVAC/OvCa plus carboplatin and gemcitabine in platinum-sensitive ovarian cancer.

Methods: In this open-label, parallel-group, phase 2 trial ( number NCT02107950), patients with platinum-sensitive ovarian cancer relapsing after first-line chemotherapy were randomized to DCVAC/OvCa and chemotherapy or chemotherapy alone. DCVAC/OvCa was administered every 3-6 weeks (10 doses). Endpoints included safety, progression-free survival (PFS; primary efficacy endpoint) and overall survival (OS; secondary efficacy endpoint).

Results: Between November 2013 and May 2015, 71 patients were randomized to chemotherapy in combination with DCVAC/OvCa or to chemotherapy alone. Treatment-emergent adverse events related to DCVAC/OvCa, leukapheresis and chemotherapy occurred in six (16.2%), two (5.4%), and 35 (94.6%) patients in the DCVAC/OvCa group. Chemotherapy-related events occurred in all patients in the chemotherapy group. Seven patients in the DCVAC/OvCa group were excluded from primary efficacy analyses due to failure to receive ≥1 dose of DCVAC/OvCa. PFS was not improved (hazard ratio [HR] 0.73, 95% confidence interval [CI] 0.42-1.28, P = 0.274, data maturity 78.1%). Median OS was significantly prolonged (by 13.4 months) in the DCVAC/OvCa group (HR 0.38, 95% CI 0.20-0.74, P = 0.003; data maturity 56.3%). A signal for enhanced surrogate antigen-specific T-cell activity was seen with DCVAC/OvCa.

Conclusions: DCVAC/OvCa combined with chemotherapy had a favorable safety profile in patients with platinum-sensitive ovarian cancer. DCVAC/OvCa did not improve PFS, but the exploratory analyses revealed OS prolongation and enhanced surrogate antigen-specific T-cell activity.