Following the publication of this paper, for the western blots shown in Fig. 1A, where the expression levels of salt-inducible kinase 1 were detected in ovarian cancer tissues, it was drawn to the Editor's attention by a concerned reader that the β-actin loading controls for patients 4, 6 and 7 were strikingly similar in appearance. This evidence concerns the gene SIK1 and ovarian carcinoma.