In addition, six IL-2-dependent T-cell lines were established from the PBMCs of a patients with Sézary syndrome-like skin disease infected with HTLV-1, a patient with HAM/TSP, and two healthy carriers of HTLV-1 in the presence of IL-2, indicating that HTLV-1-infected T cells in patients with HTLV-1-associated diseases and healthy carriers of HTLV-1 were also able to proliferate continuously in the presence of IL-2. Here, IL2 is linked to Sezary syndrome.