Activating Immune Cells in Tumors to Reverse the Spread of Epithelial Cancer

Tumor-associated macrophages (TAM) accumulation in tumors correlates with tumor cell expression of integrin αvβ3.

• TAMs are associated with promoting tumor growth and suppressing immune responses in various cancers.
• A monoclonal antibody targeting αvβ3 effectively eradicated drug-resistant lung and pancreas cancers in mouse models.
• The treatment prevented the emergence of circulating tumor cells, indicating a potential to stop cancer spread.
• The antitumor effect was dependent on the presence of macrophages, as their depletion nullified the antibody's activity.
• The antibody did not directly kill tumor cells but instead utilized macrophages to induce cell death through a specific immune response.

Simplified