Moreover, our analysis on the independent lung adenocarcinoma and squamouscarcinoma cohorts (n = 1089) from The Cancer Genome Atlas (TCGA) further indicated that patients with high expression of CD99 gene on T cells were associated with significant better overall survival (OS) (Figure 5L), reminding us the potential as tumor immune regulator of CD99. Here, CD99 is linked to lung adenocarcinoma.