Pretransplantation fetal-maternal microchimerism in pediatric liver transplantation from mother

Table 2 Biopsy-proven cellular rejection rate in pediatric patients receiving liver transplantation with maternal graft (n = 23) according to the presence or absence of pretransplantation HLA-DR NIMA-MC and HLA-DR match status n (%)

NIMA-MC and HLA-DR match status	Biopsy-proven cellular rejection	P valuea
NIMA-MC (-) (n = 10)	5 (50.0)
NIMA-MC (+) (n = 3)	0 (0)	0.23
NIMA-MC (+) or HLA-DR 0 mismatch with mother (n = 11)	2 (18.2)	0.18
NIMA-MC (+) or HLA-DR identity with mother (n = 7)	0 (0)	0.04
Total transplantation with maternal graft (n = 23)	8 (34.8)

^aP value for comparison with NIMA-MC (-) group, by two-tailed Fisher’s exact test. NIMA-MC: Microchimerism (MC) to non-inherited maternal antigen (NIMA).