CD8A and neoplasm: For 68Ga-NOTA-SNA006a, the tumor-to-muscle, tumor-to-liver, CD8+ tumor-to-CD8− tumor uptake ratio was 28.10 ± 3.68, 5.26 ± 0.86, and 19.58 ± 2.70, respectively (n = 4; Fig. 5b).