PTPRZ1 and neoplasm: In the single-cell sequencing data sourced from the CGGA database, cells were categorized into 15 clusters using CD3D, MBP, CD68, PTGS2, PTPRZ1, and BCAN. Clusters 9 and 13 were classified as T cells based on CD3D expression; cluster 1 was classified as oligodendrocytes based on MBP; clusters 0, 6, and 8 were classified as macrophages based on CD68 and PTGS2; and clusters 2–5, 7, 10–12, and 14 were classified as tumor cells based on PTPRZ1 and BCAN (Figures 2C,D).