Interestingly, a correlation was found between [89Zr]-anti-PD-1 uptake signal detected with immuno-PET and the presence of CD3+ (Cor = 0.8098; p = 0.0014) and CD8+ T cells (Cor = 0.8035; p = 0.0016) analyzed in tumor samples by IHC (Figure 3C). The gene discussed is CD8A; the disease is neoplasm.