NCAM1 and tropical spastic paraparesis: Moreover, when we performed the correlation taking into account CD56+CD3− cells, there was a significant inverse correlation with the proviral load and the frequency of CD56+CD3− cells in HC (r = -0.62 and P = 0.02) but not in HAM/TSP patients (r = -0.28 and P = 0.35) (Figures 3(b) and 3(c)).