On April 18, 2017 XOMA Corporation (Nasdaq:XOMA), a pioneer in the discovery and development of therapeutic antibodies, reported the presentation of positive data from pre-clinical studies investigating the activity of its anti-PTH1R antagonist monoclonal antibody (mAb) (Press release, Xoma, APR 18, 2017, View Source [SID1234518611]). The antibody is a potential first-in-class therapeutic agent for the treatment of hyperparathyroidism (HPT) and humoral hypercalcemia of malignancy (HHM). These presentations were made at the American Association for Cancer Research (AACR) (Free AACR Whitepaper) and the Endocrine Society (ENDO) annual meetings.

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The PTH1R receptor is part of the B GPCR family and is the primary receptor of two ligands, parathyroid hormone (PTH) and parathyroid related protein (PTHrP). Hypercalcemia can occur when elevated levels of PTH, as seen in primary HPT, or elevated levels of PTHrP, as seen in HHM, lead to excessive activation of the PTH1R receptor. A potent and long-acting receptor antagonist could reverse hypercalcemia in all these conditions.

"Consistent with our new strategy, we are seeking partners with a deep commitment to and an expertise in drug development who are interested in licensing this first-in-class antibody and taking it through the clinical development process," said Jim Neal, Chief Executive Officer of XOMA. "There is a real need for better therapies that address hypercalcemia induced by hyperparathyroidism, and we are encouraged by these data, which demonstrate the efficacy of our anti-PTH1R approach as a potential treatment for patients suffering from HPT and HHM."

Data presented at the AACR (Free AACR Whitepaper) and ENDO conferences between April 1-4, 2017 showed:

PTH1R antagonism in vitro by the anti-PTH1R mAb translated to potent in vivo activity
XOMA’s anti-PTH1R antagonist mAb has the potential to become a first-in-class therapy for HHM, as the data demonstrated it ameliorated hypercalcemia and associated morbidities in pre-clinical models
XOMA’s antibody libraries enabled the discovery of functional antibodies against a very complex target — i.e. the G-Protein Coupled PTH1Receptor
A high affinity fully human mAb to PTH1R has been selected and characterized
Proprietary antibody engineering resulted in antibodies with improved potency and manufacturing characteristics
"While hyperparathyroidism is a classic endocrine disorder, HHM spans both endocrine and oncology specialties. HHM is a life-threatening complication of many advanced cancers and is caused by tumor secretion of the PTH1R ligand, PTH-related peptide, which causes high calcium. Since current treatments often fall short of correcting hypercalcemia and many cancer patients die from such high calcium and associated metabolic complications, PTH1R antibodies could prove beneficial for the treatment of this devastating condition," said John Wysolmerski, MD, Professor of Medicine and Associate Section Chief for Research in the Section of Endocrinology and Metabolism, Yale School of Medicine.

The complete presentations can be found online at www.xoma.com/content/pipeline/publications.htm.

About XOMA’s PTH1R Monoclonal Antibodies Program
XOMA has developed unique functional antibody antagonists targeting PTH1R, a G-protein-coupled receptor involved in the regulation of calcium metabolism. These antibodies have shown promising efficacy in in vivo studies and potentially could address high unmet medical needs, including primary hyperparathyroidism (PHPT) and humoral hypercalcemia of malignancy (HHM). Some secondary and tertiary HPT cases are additionally challenging to manage via current pharmacological approaches and may be well-addressed by XOMA’s anti-PTH1R antibody.