ERCC4 and Cowden syndrome 1: Interestingly, such complex overlapping features including FA and other DNA‐repair disorders were described in a recent study that reported a malfunction of the nuclease ERCC1‐ERCC4 (XPF) resulting in complex clinical manifestations comprising Xeroderma pigmentosum (XP), Cockayne syndrome (CS), and Fanconi anemia (FA) (Kashiyama et al., 2013).