RAD51 and lung cancer: The analysis of GRNs based on microarray datasets has demonstrated the ability to identify unique and common biomarkers among different types of cancer, such as the overexpression of RAD51-associated protein 1 (RAD51-AP1) in ovarian and lung cancer in association with the poor prognosis of patients and with increased cell proliferation in cell lines of these two types of cancer, suggesting that RAD51-AP1 is a potential biomarker that can be applied in clinical practice [15].