Which regimen do you prefer for patients with newly diagnosed DLBCL that are not candidates for doxorubicin secondary to low ejection fraction?

I like to use R-CEOP per Vancouver experience. Had very good results with it and is very well tolerated. I sometimes use it also in frail older patients who have normal EF. Etoposide substitutes doxorubicin in regimen: 50 mg/m2 on D1 and 100 mg/m2 PO on days 2-3 and can also give peg filgrastim on D...