<qa>  What is the dose-dense rituximab IV?- Arm II pharmacokinetic-based dose-dense rituximab: Patients receive rituximab IV 375 mgm2 females and 500 mgm2 males over 4 hours on days -1, 0, 3, 7, 14, 21, 28, and 42. Patients also receive pegfilgrastim subcutaneously on day 4 of each course. 