Novel AMPLIVANT™ Technology Introduced at AACR Annual Meeting 2013

April 12, 2013

AMPLIVANT™ TLR-ligand adjuvant to improve immunotherapies

Leiden, The Netherlands, April 9, 2013 – ISA Pharmaceuticals B.V., a clinical-stage biopharmaceutical company focusing on rationally designed therapeutic vaccines against cancer and persistent viral infections, announces that Cornelis Melief, Professor at Leiden University and Chief Scientific Officer of ISA, presented details on the company’s novel AMPLIVANT™ technology at the American Association for Cancer Research (AACR) 2013 Annual Meeting. AMPLIVANT™ is based on a powerful, proprietary toll-like receptor (TLR) ligand designed to improve immunotherapies. This promotes direct dendritic cell targeting of the antigen as well as antigen processing, resulting in long-term activation of dendritic cells and antigen presentation.

Toll-like receptors (TLRs) expressed by immune cells such as dendritic cells (DCs) or macrophages, play a key role in innate immunity by recognizing characteristic molecular structures present on the surface of bacteria and other microorganisms. Once these TLR ligands bind to the receptors, a signaling cascade is triggered which, among other effects, activates cells initiating immune responses. Thereby, they have the capacity to generate a robust acquired immune response.

Together with other scientists at Leiden University, the ISA team had observed that adding known strong TLR ligands to a vaccine consisting of synthetic long peptides resulted in a greatly improved immune response.

“Our rationale then was to link the peptide antigen chemically to the TLR ligands in order to obtain an even more efficient antigen delivery into the dendritic cells and additional activation stimuli from the TLR ligand,” said Melief. “In addition, we found that the AMPLIVANTTM-SLP conjugate is ingested more efficiently and leads to the creation of an antigen depot in the dendritic cells. This in turn results in long-lived antigen processing and presentation at the cell surface of the DCs.”

In tumor mouse models, conjugates of TLR ligands and synthetic long peptides resulted in much greater anti-tumor activity, long-term tumor protection and increased survival as compared to vaccines consisting of mixtures of peptides or peptides plus free TLR ligands.

To improve the TLR ligand performance further and to maximize clinical benefit, a synthetic TLR2-activating ligand was modified by rational molecular design, following a crystal structure analysis of the interaction between the ligand and its receptor.

“These efforts led to the AMPLIVANT™ technology, which had already yielded a number of proprietary agonists with enhanced receptor activation and DC maturation,” Melief added. “Our AMPLIVANTTM adjuvants are 100-fold more effective in terms of receptor stimulation than existing reference adjuvants, and we have also shown that they result in enhanced priming of CD8 T-cells in vivo.”

ISA is now planning a Phase I/II study to demonstrate safety and immunogenicity. “In this study, we will validate the AMPLIVANT™-SLP conjugate concept along the lines of our ISA101 vaccine, which has demonstrated clinical efficacy against pre-malignant disease,” said Gerard Platenburg, Managing Director of ISA Pharmaceuticals. “AMPLIVANT™ conjugates are based on two synthetic long peptides chosen from the 13 SLPs of the ISA101 vaccine. The trial in patients with HPV16-positive head and neck cancer is expected to start in early 2014.”

A Phase II trial of ISA101 in vulvar intra-epithelial neoplasia has established clinical proof-of-concept. In cervical cancer, ISA101 has completed a phase I/II trial and will enter into a randomized phase II trial later this year. ISA is also about to enter a phase I/II study in anal intra-epithelial neoplasia (AIN) with ISA101.


About ISA Pharmaceuticals

ISA Pharmaceuticals B.V. is a biopharmaceutical company developing rationally designed, fully synthetic therapeutic vaccines against cancer and persistent viral infections. The company has built a proprietary vaccine platform based on the Synthetic Long Peptide (SLP®) and AMPLIVANTTM technologies, which permit the generation of safe and effective vaccines with a known mechanism of action. SLP® vaccines are broadly applicable to multiple targets and ideally suited as monotherapy or as essential components in combination with conventional cancer treatments.

Two SLP® vaccines are currently in clinical development: ISA101, targeting diseases induced by human papillomavirus (HPV) and ISA102, targeting p53-overexpressing tumors. Clinical proof-of-concept has been established with ISA101 in vulvar intraepithelial neoplasia (VIN), a pre-cancerous disease caused by HPV.

The company was founded in 2004 by Aglaia Oncology Fund and is based in Leiden, The Netherlands. For more information, please visit


AMPLIVANT™ is a novel, proprietary adjuvant technology developed by ISA Pharmaceuticals. It is based on Toll-like Receptor Ligands (TLRL) and applicable to all protein-based vaccines. It provides direct dendritic cell targeting with the TLR ligand-coupled antigen and activation of dendritic cells, leading to long-term, effective antigen presentation. Thereby, it improves the immune-stimulatory potency of vaccines by 2-3 orders of magnitude and significantly enhances their clinical efficacy.

In combination with its SLP® technology, ISA uses AMPLIVANT™ to develop novel vaccines targeting various cancers and infectious diseases.

ISA Pharmaceuticals B.V.
Gerard Platenburg, Managing Director
J.H. Oortweg 19
2333 CH Leiden
The Netherlands
Tel. +31 71 33 22 310

Media Inquiries:
Dr. Ludger Wess Ines-Regina Buth
Managing Partner Managing Partner
Tel. +49 40 88 16 59 64 Tel. +49 30 23 63 27 68

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