Results showed that propranolol remarkably inhibited LLC tumour growth (Figure 5A‐C) and increased NK cell cytotoxicity (Figure 5D), as well as the proportion in spleens (Figure 5E) and infiltration in tumours(Figure 5H), whereas it did not increase the proportions of CD4+ and CD8+ T cells in spleens (Figure 5F,G) and infiltration in tumours (Figure 5I,J). Here, CD8A is linked to neoplasm.