Ofatumumab Versus Rituximab Salvage Chemoimmunotherapy Followed by Autologous Stem Cell Transplant in Relapsed or Refractory Diffuse Large B Cell Lymphoma

Inclusion Criteria:

* Subjects with CD20 positive DLBCL or grade 3b follicular lymphoma (FL) at original diagnosis.
* Refractory to, or relapsed following, first-line treatment with rituximab combined with anthracycline- or anthracenedione-based chemotherapy as defined by the protocol.
* CT with involvement of 2 or more clearly demarcated lesions/ nodes with a long axis \> 1.5 cm and short axis \>= 1.0cm or 1 clearly demarcated lesion/ node with a long axis \> 2.0 cm and short axis \>= 1.0 cm.
* Baseline FDG-PET scans must demonstrate positive lesions compatible with CT defined anatomical tumor sites.
* Age 18 yrs or older.
* ECOG performance status of 0, 1 or 2.
* Eligible for high dose chemotherapy and ASCT.
* Resolution of toxicities from first-line therapy to a grade that in the opinion of the investigator does not contraindicate study participation.
* Signed written informed consent.

Exclusion Criteria:

* Previous cancer therapy for lymphoma, with the exception of first-line rituximab/ anthracycline- or anthracenedione-based chemotherapy, monotherapy rituximab prior to or combined with first-line chemotherapy, as maintenance therapy, and radiotherapy in a limited field or as a part of the first-line treatment plan.
* Any anti-cancer therapy, except limited field radiotherapy, within 2 weeks prior to start of study therapy.
* Planned post-randomization chronic glucocorticoid use (limited acute use is allowed and defined by the protocol) unless administered as therapy for mild COPD or asthma.
* Clinically significant cardiac disease, active or chronic infections, serious significant diseases, other cancer within last 5 years. History of significant cerebrovascular disease.
* Prior treatment with anti-CD20 monoclonal antibodies with the exception of rituximab.
* Abnormal/ inadequate WBC count, liver, and kidney function.
* Pregnant or lactating women or female patients of child-bearing potential (or male patients with such partners) not willing to use adequate contraception during and up to 1 year following dosing completion.