ATX antigen levels correlated significantly with serum tBA levels in pediatric ASC patients with pruritus (Spearman r = 1, p = 0.0028) but not with tBA levels in ASC patients without pruritus (Spearman r = 0.53, p = 0.079). The gene discussed is ENPP2; the disease is Tako-tsubo cardiomyopathy.