This is an expression of concern regarding: Wanfeng Yu, Xin He, Ying Ni, Joanne Ngeow, Charis Eng, Cowden syndrome-associated germline SDHD variants alter PTEN nuclear translocation through SRC-induced PTEN oxidation, Human Molecular Genetics, Volume 24, Issue 1, 1 January 2015, Pages 142–153, https://doi.org/10.1093/hmg/ddu425. This evidence concerns the gene PTEN and Cowden disease.