Tumor-Educated Lymph Nodes: Comprehensive Remodeling or Stepwise

Lymph nodes (LNs) play a dual role in tumor progression. On one hand, LNs serve as critical sites for initiating tumor-specific immune responses and mounting effective anti-tumor immunity. On the other hand, LNs are among the first organs targeted by various solid tumors, which exploit the LN microenvironment to establish a pro-metastatic immunosuppressive niche. Given the immunological potential of lymph nodes, the mechanisms underlying lymph node metastasis (LNM), along with associated detection methods and therapeutic strategies, have become major foci of current oncology research. However, the fundamental mechanisms that govern LNM remain largely unresolved, limiting the development of targeted interventions. This review summarizes recent advances in the understanding of the modes and mechanisms by which tumors invade and remodel LNs. Special attention is given to the presence and clinical significance of micrometastasis and intranodal heterogeneity. Furthermore, we discuss the therapeutic potential of targeting the metastatic LN microenvironment, offering perspectives for future research directions that may lead to innovative strategies for reversing LNM-induced immunosuppression and improving patient outcomes.