PCNA and neoplasm: This expression profile suggests that these cells may function as an immunoregulatory NK population specialized in coordinating antitumor immunity and modulating the tumor microenvironment.The STMN1+NK subpopulation showed high expression of TYMS, DUT, and PCNA, with characteristic genes enriched in biological processes such as DNA replication, DNA recombination, and repair mechanisms (Figure 3F; Supplementary Table S5).