RecruitingPhase 2Drug trialConsolidation With Loncastuximab Tesirine After a Short Course of Immunochemotherapy in BTKi-treated (or Intolerant) Relapsed/Refractory Mantle Cell Lymphoma Patients.This is a prospective, phase 2, multicenter, open-label, single-arm study. Primary objective is to assess the efficacy of loncastuximab tesirine given as consolidation therapy after salvage immunochemotherapy in BTKi (Bruton Tyrosine Kinase inhibitors) -treated (or BTKi intolerant) R/R (Relapse or Refractory) MCL (Mantle Cell Lymphoma) patients. The sponsor of this clinical trial is Fondazione Italiana Linfomi - ETS (FIL ETS).