LILRB1 and neoplasm: Contrary to LILRB1+ NK cells, the frequency of NK cells expressing T-cell immunoreceptor with Ig and ITIM domains (TIGIT), a critical inhibitory receptor correlated with NK cell exhaustion in host anti-tumor immunity (Zhang et al, 2018), was decreased in ATB patients (Fig. 4B; Appendix Fig. S5A,C).