KCNA4 and breast cancer: In particular, the expression of Kv1.3 was altered in poorly differentiated breast cancer [40], while Kv1.1, Kv1.2, Kv1.3, Kv1.4, Kv4.2, Kv4.3 and Kv9.3 decreased, as undifferentiated human mesenchymal stem cells (MSCs) differentiated into adipocytes [41].