How would you treat an elderly male with history of mantle cell lymphoma who relapsed after chemoimmunotherapy and cBTKi w/ multiple co-morbidities including CKD and CHF w/ low EF?  

There's obviously a lot of additional information that would help in making individual patient-level recommendations here. What was the first line of chemoimmunotherapy, and how was it tolerated? How long was his duration of response? How was the response to covalent BTKi in depth and duration? What...