CNTN2 and astrocytoma (excluding glioblastoma): Since soluble factors secreted by HTLV-1 infected T cell lines, particularly soluble Tax1 protein, have been described to exert paracrine effect on target cells [15], we investigated whether supernatants from HTLV-1+ T cell lines could affect the expression of cell adhesion and migration-related genes on astrocytoma cell lines.