375 mg/m2 weekly, wk 1–4, 2 months after end of induction (29)
375 mg/m2 weekly, wk 1–4, every 6 months for 3 times (10)
375 mg/m2 at month 2, 4, 6, 8 after end of induction (13)
375 mg/m2 every 3 months for 2 years (24)
375 mg/m2 every time the rituximab blood levels falls under 25 mg/mL (16)
375 mg/m2 every 2 months for 2 years (ongoing PRIMA study)