KCNJ3 and breast cancer: Our results underscore these seminal findings using a substantially larger number of patient samples: we observed a significant increase of KCNJ3 mRNA expression levels in tumors of lymph node positive patients when compared to lymph node negative ones in our evaluation of 867 patients, and KCNJ3 mRNA levels were significantly higher in breast cancer samples than in corresponding normal breast tissue in a set of 105 patient samples.