ERCC2 and breast cancer: Similarly, ERCC1 and ERCC2 expression levels were significantly correlated (r = 0.61, p-value = 2 × 10−5, n = 75) in triple negative, but not correlated (r =  − 0.10, p-value = 5 × 10−1, n = 68) in luminal A Breast cancer patients [35].