Correlation of increased KCNJ3 expression levels and breast cancer progression has been shown by several studies: Stringer et al. [11] reported increased levels of KCNJ3 mRNA in primary invasive breast carcinomas when compared to corresponding normal breast tissue and found a positive correlation between KCNJ3 mRNA expression levels in the tumor and the number of metastatic lymph nodes. The gene discussed is KCNJ3; the disease is invasive breast carcinoma.