P651: VENETOCLAX-BASED TREATMENT OF PATIENTS WITH RICHTER SYNDROME: OUTCOMES FROM A MULTICENTER RETROSPECTIVE STUDY. (23rd June 2022) - Hampel, P.; Parikh, S.; Wierda, W.; Ferrajoli, A.; Jain, N.; Burger, J.; Call, T.; Wang, Y.; Kenderian, S.; Ding, W.; Thompson, P.