The influence of inosiplex treatment on the neurological disability of patients with subacute sclerosing panencephalitis.

Subacute sclerosing panencephalitis is a central nervous system degenerative disease that rapidly progresses to death in most untreated cases. In this study we compare the level of neurological disability longitudinally in a group of SSPE patients receiving inosiplex (Isoprinosine) treatment (12) to a historical control group of untreated patients (15). The mean ND did not differ between the groups from onset of SSPE through 21 months. From two years through four and one-half years the inosiplex group had significantly lower ND compared to the nontreatment group. The subjects were then divided into four subgroups: Group 1, rapidly progressing SSPE, not treated; Group 2, slowly progressing SSPE, not treated; Group 3, rapidly progressing SSPE, inosiplex treated; and Group 4 slowly progressing SSPE, inosiplex treated. The rapidly developing groups did not differ in ND at any time. The slowly developing treated group had significantly lower ND than the slowly developing untreated group from two and one-half years to four and one-half years after onset of SSPE. These findings suggest that inosiplex is effective in the slowly developing or chronic form of SSPE.