The characterization of RUNX1-mediated macrophage polarization requires a multidimensional perspective beyond the...

Area of Science:

• Oncology
• Immunology
• Molecular Biology

Background:

• The M1/M2 macrophage classification is widely used but may oversimplify complex in vivo tumor-associated macrophage (TAM) phenotypes.
• Recent data suggest TAMs exist on a continuum and can co-express markers traditionally assigned to different states.

Purpose of the Study:

• To comment on the role of RUNX1 in non-small cell lung cancer (NSCLC) progression.
• To propose a more nuanced understanding of RUNX1-induced macrophage reprogramming beyond the M1/M2 paradigm.

Main Methods:

• Literature review and commentary on existing findings.
• Discussion of single-cell and spatial profiling data.
• Proposal for advanced TAM subtype annotation strategies.

Main Results:

• RUNX1 promotes NSCLC progression through the ACP5/β-catenin/SMAD3 axis, inducing a pro-tumoral macrophage program.
• The "M2 polarization" label may be insufficient to describe RUNX1-driven TAM states.
• RUNX1 might induce a specific TAM transcriptional signature.

Conclusions:

• Future studies should utilize high-resolution TAM subtype annotations (e.g., SPP1, C1QC signatures) for precise characterization.
• Validation in immunocompetent models and identification of upstream inducers are crucial for mechanistic completeness and translational relevance.