A total of 1879 breast cancer patients of the Kaplan–Meier plotter database (http://kmplot.com/analysis) (accessed on 28 November 2023) were divided into the “high” and “low” groups based on the FEN1 mRNA expression and the overall survival was presented in a Kaplan–Meier plot (Figure 9B) [52,53]. Here, FEN1 is linked to breast cancer.