The syndrome of inappropriate secretion of antidiuretic hormone associated with SCT: clinical differences following SCT using cord blood and BM/peripheral blood.

Previously, we reported the syndrome of inappropriate secretion of antidiuretic hormone (SIADH) as an underestimated complication associated with SCT. In the present report, we analyzed detailed data on a larger number of patients with SIADH following SCT and found different SIADH clinical features following cord blood SCT (CBSCT) and BMT/PBSCT. The median onset of SIADH following CBSCT and BMT/PBSCT was 19 and 46 days after SCT, respectively, and the median numbers of WBC at the onset of SIADH were 1.0 and 3.1 x 10(9)/l, respectively. Furthermore, severe symptoms such as seizures, somnolence and rigidity of limbs were observed only in patients with CBSCT (8/15 vs 0/10). These differences were statistically significant (P<0.01). Although the precise basis for SIADH following SCT still remains unknown, the different features of SIADH observed following CBSCT and BMT/PBSCT may provide important clues to the disease mechanism following SCT. Additionally, we confirmed our previous results that patients with SIADH showed a higher overall survival and event-free survival rates. However, we first suggested that they had some neurological disorders and that neurological sequelae such as developmental delay and seizures would consequently occur.