FASN and esophageal squamous cell carcinoma: In terms of mechanism, HNRNPA2B1 promotes the progress of ESCC by up-regulating the expression of fatty acid synthase ATP citrate lyase (ACLY) and aminocyclopropane- 1-carboxylate (ACC1), indicating that HNRNPA2B1, as a carcinogenic factor, promotes the progression of ESCC by accelerating fatty acid synthesis, and may become a prognostic biomarker and therapeutic target of ESCC.