Research

IMMU-114

Background

IMMU-114 is a novel humanized antibody directed against an immune response target, HLA-DR, for the treatment of patients with B-cell cancers. HLA-DR is a receptor located on the cell surface whose role is to present foreign objects to the immune system for the purpose of eliciting an immune response. Increased presence of HLA-DR in hematologic cancers has made it a prime target for antibody therapy.

Although other anti-HLA-DR antibodies have been developed, IMMU-114 is distinguished by having a different immunoglobulin class, IgG4, which does not function by the usual effector-cell activities of antibodies, such as complement-dependent cytotoxicity (CDC) and antibody-dependent cellular cytotoxicity (ADCC). As a result, IMMU-114 does not rely on an intact immune system in the patient to kill tumor cells. Furthermore, because ADCC and CDC are believed to play a major role in causing the side effects of antibody therapy, we expect IMMU-114 to be less toxic to patients.

By targeting HLA-DR, a receptor that is different from the antigen targeted by rituximab or other antibodies in development for NHL and other B-cell malignancies, IMMU-114 may represent a new tool in the arsenal to combat these cancers.

Clinical Studies

NHL/CLL
The anti-HLA-DR antibody is being investigated in a Phase I dose-escalation study as a monotherapy for patients with NHL or CLL.

References

  • Chen X, Chang CH, Stein R, Goldenberg DM. The humanized anti-HLA-DR moAb, IMMU-114, depletes APCs and reduces alloreactive T cells: implications for preventing GVHD. Bone Marrow Transplant. 47(7):967-80, 2012.
  • Park KH, Sawada T, Murakami T, Ishii Y, Yasuo M, Fuchinoue S, Goldenberg DM, Kubota K. Anti-class II -DR humanized monoclonal antibody, IMMU-114, blocks allogeneic immune response. Am J Surg. 204(4):527-34, 2012.
  • Stein R, Balkman C, Chen S, Rassnick K, McEntee M, Page R, Goldenberg DM. Evaluation of anti-human leukocyte antigen-DR monoclonal antibody therapy in spontaneous canine lymphoma. Leuk Lymphoma. 2011 Feb;52(2):273-84. doi: 10.3109/10428194.2010.535182. Epub 2010 Dec 6.
  • Stein R, Gupta P, Chen X, Cardillo TM, Furman RR, Chen S, Chang CH, Goldenberg DM. Therapy of B-cell malignancies by anti-HLA-DR humanized monoclonal antibody, IMMU-114, is mediated through hyperactivation of ERK and JNK MAP kinase signaling pathways. Blood. 2010 Jun 24;115(25):5180-90. doi: 10.1182/blood-2009-06-228288. Epub 2010 Jan 25.
  • Stein R, Qu Z, Chen S, Solis D, Hansen HJ, Goldenberg DM. Characterization of a humanized IgG4 anti-HLA-DR monoclonal antibody that lacks effector cell functions but retains direct antilymphoma activity and increases the potency of rituximab. Blood. 2006 Oct 15;108(8):2736-44. Epub 2006 Jun 15.