By assessing tumor-infiltrating myeloid cells (TIMs) in patients with non-small-cell lung cancer (NSCLC) using scRNA-seq, 25 TIM-specific genes, such as TREM2, CD81, MARCO, and APOE, were consistently identified, and their expression in bone marrow cells from different species was extremely heterogeneous (29, 30). Here, MARCO is linked to non-small cell lung carcinoma.