Real-World Experience of Talimogene Laherparepvec (T-VEC) in Old and Oldest-Old Patients with Melanoma: A Retrospective Single Center Study.

Purpose: Rising melanoma incidences lead to an increasing need for individual therapy strategies in old patients. Talimogene laherparepvec (T-VEC) is a modified herpes simplex virus, approved for the local treatment of unresectable metastatic melanoma. Since data on the efficacy and safety of geriatric patients are sparse, this study was conducted to gain further real-world experience in the treatment of old and oldest-old patients with T-VEC and to obtain data on therapy costs in this population in Germany.

Patients And Methods: We performed a retrospective analysis, including all patients with a minimum age of 75 years who were treated with T-VEC from August 2016 to September 2020 in the Skin Cancer Center of the University Hospital Frankfurt, Germany. Patient clinicopathological data, treatment responses, toxicities, treatment-specific data and therapy costs were assessed.

Results: Twelve patients with a median age of 83 years (75-89 years) at the start of treatment were identified. By the end of the study, three (25%) patients experienced complete remission (CR), four (33%) experienced partial response (PR), two patients (17%) remained at stable disease (SD) and three (25%) patients suffered from progressive disease (PD). Overall response rate was 58.3%, and durable response rate was 41.7%. There were no treatment-related adverse events grade 3 or higher. The median duration of treatment was seventeen weeks (3-57 weeks). Median medication costs in the patients who had completed treatment (=10) were calculated to be 27,325 Euros in Germany.

Conclusion: This study provides further evidence for an effective use of T-VEC in old and oldest-old patients. The low rate of adverse events seems to be favorable compared to other systemic melanoma therapies. Furthermore, duration of treatment was short and therapy costs were lower than would have been expected from clinical trial data. Altogether, these data encourage the use of T-VEC in this special patient cohort.