Multivariate analysis also showed that the invariable clonality of TRDV1 gene repertoire after G-CSF mobilization indicated low incidence of GVHD (P = 0.015, odds ratio (OR) = 0.047, 95% confidence interval (CI): 0.004-0.552), and it was no significant association between GVHD and the alteration of expression levels of three TRGV subgroups after G-CSF mobilization (P = 0.806, P = 0.458, P = 0.719, respectively). The gene discussed is TRDV1; the disease is graft versus host disease.