On January 22, 2018 The biopharmaceutical company MOLOGEN AG (ISIN DE0006637200; Frankfurt Stock Exchange Prime Standard: MGN) reported data on its lead compound, the TLR9 agonist and immune surveillance reactivator lefitolimod, at the Annual 2018 Gastrointestinal Cancers Symposium (ASCO GI) in San Francisco (18 – 20 January 2018) (Press release, Mologen, JAN 22, 2018, View Source [SID1234523467]).
Monotherapy with lefitolimod resulted in a beneficial modulation of the tumor microenvironment (TME) associated with a reduced tumor growth in a murine model of colorectal cancer. The beneficial lefitolimod-induced modulation of the TME strongly supports its potential as cancer immunotherapeutic agent. Hence, in addition to its potential in monotherapy, lefitolimod may also be an ideal partner for immuno-oncology combination approaches, i.e. with checkpoint inhibitors.
"Beneficial modulation of the TME, in other words making immunologically "cold" tumors "hot", is a crucial requirement for the response to immunotherapeutic approaches. The presented data clearly support the mode-of-action of lefitolimod in our late-stage IMPALA study with single-agent lefitolimod in colorectal cancer. In addition they provide an excellent rationale for combining lefitolimod with checkpoint inhibitors. We know that checkpoint inhibitors need help to fully unfold their enormous potential and we believe that our TLR9 agonist lefitolimod will play a major role also in this context", said Dr Matthias Baumann, CMO of MOLOGEN AG.
Beneficial lefitolimod-induced modulation of the TME
After intratumoral injection of lefitolimod an increased infiltration of T cells (CD3+ T cells, especially CD8+ T cells) into the tumor was observed. Furthermore, also an increase of activated CD8+ T cells with cytolytic ("cell destruction capability") potential was determined. In addition, the injection of lefitolimod had a positive impact regarding so-called tumor-associated macrophages – immune cells that interact with tumor cells to influence the initiation, growth and metastasis of tumors. Lefitolimod led to an increase of anti-tumor M1-type macrophages within the tumor, accompanied with a decrease of pro-tumorigenic M2-type macrophages.
Importantly, this beneficial TME modulation from an immunosuppressed ("cold") towards a more immunoreactive ("hot") stage translated into a reduction of tumor growth in the mice.
Lefitolimod as a partner for immuno-oncological combination therapies
The lefitolimod-induced pathway provides the rationale for combining lefitolimod with checkpoint inhibitors. Response rates to checkpoint inhibitor immunotherapy vary between different tumor entities and depend on the nature of the TME. "Hot" tumors with a T cell infiltrated TME show better responses. Therefore modulation of the TME is a crucial requirement for the response to immunotherapeutic approaches.
First combination data of lefitolimod with checkpoint inhibitors have been presented at the ASCO (Free ASCO Whitepaper) GI 2017. The data showed that lefitolimod can significantly improve the anti-tumor effect of checkpoint inhibitors, particularly anti-PD-1 and anti-PD-L1 antibodies, and thus prolong survival in murine tumor models.
For more information on ASCO (Free ASCO Whitepaper) GI please visit the website:
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