CD8A and neoplasm: Single‐cell RNA sequencing with paired T‐cell receptor (TCR) sequencing in 10 patients with gastric cancer identified a CD8+ T‐cell cluster with an effector memory (EM) phenotype with shared TCRs in the tumour and blood; this subset was enriched for migration‐related gene signatures, including CX3CR1 and several granzyme‐encoding genes, suggesting migratory abilities from the blood into tumour.10