Pretransplantation fetal-maternal microchimerism in pediatric liver transplantation from mother

Table 1 Characteristics of the pediatric patients receiving liver transplantation (n = 26) according to the presence or absence of HLA-DR NIMA-MC n (%)

Factors1	NIMA-MC (+)	NIMA-MC (-)	P value
	(n = 6)	(n = 20)
Age at the time of transplantation in years (range)	6.1 (1-14)	6.7 (0-16)	0.57
Age at the time of transplantation (less than 12 mo)	3 (50.0)	7 (35.0)	0.64
Sex, male: female	4 (66.7): 2 (33.3)	6 (30.0): 14 (70.0)	0.16
Recipient weight, kg (range)	28.9 (10.8-54.5)	27.8 (8.1-56.3)	0.92
Original liver disease			0.65
Biliary atresia	4 (66.7)	9 (45.0)
Others	2 (33.3)	11 (55.0)
ABO identical to that of mother	3 (50.0)	13 (65.0)	> 0.99

¹Continuous data are presented as median values with range. NIMA-MC: Microchimerism (MC) to non-inherited maternal antigen (NIMA).