Innate Pharma SA announced that the US Food and Drug Administration (FDA) has granted Fast Track designation to IPH4102 for the treatment of adult patients with relapsed or refractory Sézary syndrome (SS) who have received at least two prior systemic therapies. IPH4102 is Innate Pharma’s wholly-owned first-in-class anti-KIR3DL2 antibody, developed for the treatment of T-cell lymphoma. Fast Track is a process designed to facilitate the development and expedite the regulatory review of investigational drugs to treat serious conditions and fill an unmet medical need. Sézary syndrome is the leukemic variant of cutaneous T-cell lymphoma (CTCL), a heterogeneous group of non-Hodgkin’s lymphomas which arise primarily in the skin. Patients often experience very poor quality of life with severe and debilitating pruritus (chronic itchy skin). Despite recent advancements, Sézary syndrome is associated with a high relapse rate with currently available therapies. Fast track designation is based on preliminary results of the Phase I dose-escalation and expansion study of IPH4102 in advanced CTCL (n=44). As of October 15, 2018, data from the subgroup of 35 SS patients revealed strong clinical activity, demonstrated by an overall response rate (ORR) of 42.9%, median duration of response (DoR) of 13.8 months and median progression-free survival (PFS) of 11.7 months. The ORR appeared to be higher (n=28, 53.6%) in patients with no histologic evidence of large cell transformation (LCT)1. Importantly, clinical activity was associated with a substantial improvement in quality of life as assessed by the SkinDex29 and Pruritus Visual Analog Scale (VAS) scores. IPH4102 displayed a favorable safety profile, consistent with previous observations.