Identifying and De-risking HLA/Peptide Targets for Immuno-oncology

Pure MHC, LLC is a leading discovery and development company with platform technology and expertise in disease-specific HLA Class I and Class II target identification and validation, as well as immunotherapeutic drug development for cancer, infectious, and autoimmune diseases. In this webinar, members of the Pure MHC research team will present and discuss data and learnings drawn from decades of experience identifying and validating HLA peptide targets for therapeutic development. Special emphasis will be given to mitigating risk in preclinical target selection for oncology based on assessment of HLA peptide presentation profiles.


In this webinar, members of the Pure MHC scientific team share how to:


• Use Pure MHC’s Peptide HLA Immunotherapy Data Resource (PHIDR) healthy tissue database to de-risk HLA/peptide targets

• Use Pure MHC immunoproteomics to assess target frequency on primary tumors

• Determine the expression of public HLA/peptide on healthy tissues

• Access Pure MHC’s novel tumor-specific HLA/peptide targets

• Determine the frequency of your targets on tumors


Only a small percentage of the changes that arise within a cancerous cell can be directly targeted by the human immune system – most neoplastic changes are not “visible” for antibody targeting at the plasma membrane.  It is the human major histocompatibility complex class I molecules, or human leukocyte antigens (HLA), that transport peptide fragments of tumor antigens to the surface of the cancerous cell, thereby allowing T lymphocytes to review the entirety of the intracellular protein content of a tumor cell.  HLA molecules sample peptides derived from (1) tumor specific oncogenes, (2) mutated tumor suppressor genes, (3) aberrantly expressed oncofetal proteins, and (4) tumor related proteins. HLA molecules present these tumor-specific peptides at the cell surface. 

Pure MHC has a combined expertise in immune proteomics and HLA biology, and here we describe use of Pure MHC’s proprietary Peptide HLA Immunotherapy Data Resource (PHIDR) healthy tissue HLA database to de-risk the development of TCR, TCR mimetics, and T cell eliciting immune therapies.  We first describe how our immune therapy partners access the PHIDR healthy tissue database, assessing the frequency and abundance of their selected HLA/peptide targets on healthy human organs and tissues.  Next, we describe the Pure MHC approach for identifying HLA/peptide complexes on primary tumor tissues and the subtractive use of the PHIDR healthy tissue database to provide a select list of HLA/peptide complexes that are found only on tumors.  The frequency and abundance of HLA/peptide targets on tumors, their absence from healthy tissues, and the promise that carefully selected tumor specific HLA peptide complexes offer to the architects of immune therapies are discussed.