To understand whether ERp29 expression confers to radioresistance in MDA-MB-231 breast cancer cells, the ERp29-transfected cells (MB-231/ERp29) and mock-transfected (MB-231/vector) control cells were exposed to ionizing radiation (0–6 Gy) and the post-irradiation survival of cells was analysed by clonogenic assay. Here, ERP29 is linked to breast cancer.