marginal significancep = 0.072
When MMP9, TIMP1 and RECK expression levels were analyzed according to surgical outcome, surprisingly we found that the median expression levels of MMP-9 was three times higher in children who were successfully treated by surgery ( n = 10) compared to those did not have success ( n = 6), with a marginal significance ( p = 0.072), TIMP-1 was underexpressed in 100 % of this cases ( p = 0.00) and RECK was overexpressed in 80 % of this same cases ( p = 0.082).