Although Kanczuga-Koda, Sulkowski & Lenczewski (2006) showed higher Cx43 expression in lymphatic metastases compared to the primary breast cancer as well as different localization of Cx43 expression (membranous in lymph nodes vs. cytoplasmic in primary tumor), we noted that for lung cancer lymphatic metastases showed similar expression to the primary tumor in most cases. Here, GJA1 is linked to breast cancer.