In the Garraway 2018 paper, which myeloid cell plays an important role in tumor progression and angiogenesis in colorectal cancer and was examined?

• A. CD8+ T cells
• B. Neutrophils
• C. Monocyte-derived macrophages
• D. Differentiated CD11b+

Answer: (D)

Differentiated CD11b+ myeloid cells within the tumor microenvironment are key promoters of both tumor growth and new blood vessel formation in colorectal cancer. CD11b marks cells of the myeloid lineage (such as monocytes and macrophages that mature in the tumor context). When these cells differentiate in the tumor, they commonly adopt pro-angiogenic and pro-tumor functions, releasing VEGF, matrix metalloproteinases, and other factors that stimulate endothelial cells and remodeling of the surrounding tissue. The Garraway 2018 study specifically examined this differentiated CD11b+ population and found its involvement in driving angiogenesis and tumor progression in colorectal cancer, underscoring the significant role of this myeloid subset in shaping the tumor vasculature and growth.