Phase 2 multicentre study of single-agent ofatumumab in previously untreated follicular lymphoma: CALGB 50901 (Alliance)

Cara A. Rosenbaum, Sin Ho Jung, Brandelyn Pitcher, Nancy L. Bartlett, Sonali M. Smith, Eric Hsi, Nina Wagner-Johnston, Sachdev P. Thomas, John P. Leonard, Bruce D. Cheson

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Rituximab monotherapy has proven efficacy in treatment-naïve, asymptomatic advanced-stage follicular lymphoma (FL). Ofatumumab is a fully humanized anti-CD20 monoclonal antibody with increased CD20 affinity and complement-dependent cytotoxicity. This phase 2 trial (NCT01190449) evaluated ofatumumab in patients with untreated, low/intermediate-risk FL International Prognostic Index (FLIPI), advanced-stage FL to determine single-agent efficacy. Patients with measurable disease in stages III/IV or bulky stage II, regardless of Groupe d'Etude des Lymphomes Folliculaires criteria, received 4 weekly 1000 mg doses followed by four extended induction doses once every 8 weeks. Primary endpoint was overall response rate (ORR) to 1000 mg; secondary endpoints were progression-free survival (PFS) and safety. Fifty-one patients were enrolled. Fifteen patients were randomized to 500 mg prior to discontinuing that arm for slow accrual. Among 36 patients on the 1000 mg arm, ORR was 84%, median PFS was 1·9 years and median response duration was 23·7 months. All patients remain alive. No grade 4 infusion reactions or grade 3/4 infections occurred. Grade 3 infusion reactions occurred in 25% in the 1000 mg arm only (all first infusion); all but two patients continued on study. Discontinuation was 6% for the total study population. Ofatumumab monotherapy administered by extended induction in untreated, low/intermediate-risk FLIPI, advanced-stage FL is well tolerated and active. Activity appears similar to that reported with single-agent rituximab.

Original languageEnglish
Pages (from-to)53-64
Number of pages12
JournalBritish Journal of Haematology
Issue number1
StatePublished - Apr 2019


  • follicular lymphoma
  • immunotherapy
  • monoclonal antibody
  • ofatumumab
  • previously untreated


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