Potentiation of Cisplatin-based Chemotherapy by Digoxin in Advanced Unresectable Head and Neck Cancer Patients

Introduction: Patients with primary unresectable advanced head and neck squamous cell carcinomas (HNSCC) have a poor prognosis with a median survival of 22 months (Hauswald H Radiat Oncol 2011). They are usually treated with induction chemotherapy followed by radiochemotherapy or platinum-based concomitant radiochemotherapy. Most patients achieve an objective clinical response contrasting with a high rate of local recurrence and distant metastases in the year following radiochemotherapy (Argiris A Ann Oncol 2011). Improvement of the efficacy of chemotherapy remains therefore a major clinical goal for this group of patients. During the past years, the investigators demonstrated that some conventional chemotherapeutics (anthracycline, oxaliplatin…) induce a type of "immunogenic" cell death (ICD) characterized by the exposure of calreticulin on the tumor cell surface, the secretion of ATP and the release of high-mobility group box 1 (HMGB1) resulting in activation of tumor immunity (Galluzzi L Nat Rev Drug Discov 2012). The investigators recently showed that the Na/K-ATPase inhibitor, digoxin, favors ICD, when combined with cisplatin, a drug known not to induce ICD. In preclinical models, a synergy between cisplatin and digoxin which led to a significant therapeutic improvement (Menger L Sci Transl Med 2012) has been observed. This effect seems to be mediated by the immune system as the combined therapy induced intratumor T cell infiltration producing cytokines (Menger L Sci Transl Med 2012). Hypothesis: Based on our preclinical data, the hypothesis is that adding digoxin to the conventional cisplatin based induction chemotherapy regimen in unresectable advanced HNSCC will increase the efficacy of this therapy via the induction of anti-tumor immunity. Objectives: Main: the primary objective is to assess the clinical and biological safety of the combination of digoxin to cisplatin-based chemotherapy. Secondary: The secondary objectives are to investigate biological