Phase III Study
Phase III Study
MAVIS (Melanoma Antigen Vaccine Immunotherapy Study) is a multicenter, double-blind, placebo-controlled adaptive Phase III trial to assess the safety and efficacy of seviprotimut-L, with primary endpoints of recurrence-free survival (RFS) and overall survival (OS) in patients with melanoma at high risk of recurrence after definitive surgical resection. MAVIS is being conducted under a Special Protocol Assessment (SPA) agreement with the FDA.
By intent-to-treat (ITT) analysis, RFS was not significantly enhanced for seviprotimut-L in the overall study population but did trend slightly higher. However, strong responses were seen in two well-defined subpopulations based on disease stage and age at time of treatment. Specifically, interim efficacy analysis of subgroups based on pre-planned stratification suggested enhanced RFS for seviprotimut-L among two patient populations: those with AJCC Stage IIB/C melanoma and those under the age of 60.
Age has been identified as a cause of decreased immune competence1; thus, outcomes were assessed as a function of age as an effect modifier. Effects estimates for patients aged less than 60 years are favorable to seviprotimut-L in the overall population (Hazard Ratio= 0.61, 95% CI [0.36, 1.05]) and in the Stage IIB/IIC population (Hazard Ratio= 0.239, 95% CI [0.083, 0.69]).
Seviprotimut-L is well-tolerated with treatment-emergent adverse events (AEs) similar to placebo patients. There were no serious adverse events or Grade 4 or 5 adverse events in the 347 patients studied, and the vast majority of events were Grade 1-2 injection site reactions that were managed by topical cream/s or an over-the-counter antihistamine
- Dorshkind K, Swain S. Age-associated declines in immune system development and function: causes, consequences, and reversal. Curr Opin Immunol 2009; 21: 404-407
Recurrence-free Survival (RFS): Seviprotimut-L vs. Placebo
A. RFS for the Overall Patient Population
B. RFS for Stage IIB/C Patient Subgroup
C. RFS by Age for the Overall Patient Population
D. RFS by Age for Stage IIB/C Patients
|____Table 1: Enrollment and adverse events||Seviprotimut-L||Placebo|
|Grade 3 AEs||12%||9%|
|Grade 4-5 AEs||0%||0%|
|AEs leading to d/c study drug||0.9%||0.9%|
|Rx-related AEs leading to d/c study drug||0.4%||0%|