Can Soluble Klotho Protein Be a Potential Tumor Biomarker

To the Editor We read with great interest the article by Devaraj et al.1 According to the authors, soluble Klotho protein (sKL) appears to be an effective biological factor related to diabetes and chronic kidney disease. However, there is a paucity of data on sKL levels in patients with cancer. Therefore, we put forward these questions: Can we detect the level of sKL in the serum samples of patients with …