Forkhead box P3 (FOXP3)+ regulatory T cells (Tregs) were enriched in the TA-TLS (Fig. 5F) as reported (Williams et al., 2016), and some FOXP3+ nuclei (25.9% on average) were co-stained for Ki67, showing the phenotype of tumour-associated proliferating Tregs (Plitas et al., 2016). The gene discussed is MKI67; the disease is neoplasm.