
The study investigated the evolution of immune profiles in non-small cell lung cancer (NSCLC) from primary tumors to distant and local metastases. The findings revealed that distant metastases exhibited decreased CD8+ T cell levels and increased chromosomal instability compared to primary tumors. This was attributed to acquired DNA damage repair deficiency. Distant metastases were characterized by immunosuppression and immune evasion, while local metastases were immune-competent. Primary tumors with high CD4+ T cell levels were associated with distant metastases. Data from TCGA and single-cell RNA-sequencing supported these findings. The study suggests that the immune background of primary tumors can influence their metastatic potential in NSCLC.
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