Interestingly, a recent study SPINK1-positive castrate resistant prostate cancer identified POU5F1/OCT4 as part of a gastrointestinal gene signature present in SPINK1-positive prostate cancer and regulated by HNF1A and its target gene HNF4G (Shukla et al., 2017). The gene discussed is HNF4G; the disease is prostate carcinoma.