What is your preferred third-line therapy for a fit patient with symptomatic, relapsed follicular lymphoma who has failed bendamustine-rituximab and lenalidomide-rituximab?  

This sounds like the patient where a CART may make sense. If that's not an option for whatever reason, I may go to bi-specific over say, copanlisib at this point. I suppose if EZH2 mutated, tazamezostat might be an option, but less appealing in a young otherwise healthy person. 

CART makes the most sense in this context.