For example, Sox2 overlapping transcript (Sox2ot) was overexpressed in CCA and related to prognosis of patients [16]; small nucleolar RNA host gene 1 (SNHG1) facilitated proliferation and migration of CCA cells through epigenetically inhibiting cyclin dependent kinase inhibitor 1A (CDKN1A) [17]. The gene discussed is CDKN1A; the disease is cholangiocarcinoma.