Retrospective analysis does not equate to prospective efficacy in drug trials for brain cancer

A variety of observational studies have been performed with respect to glioblastoma multiforme, the most lethal form of brain cancer, and the use of sodium valproate, an antiepileptic drug. Patients treated with sodium valproate for epilepsy have showed a improved outcome with respect to survival time and recurrence compared to patients treated with other antiepileptic…