| *HMGA1 & HMGA2 together may be useful for differentiating from adenocarcioma.<ref name=pmid23530587>{{Cite journal | last1 = Zakharov | first1 = V. | last2 = Ren | first2 = B. | last3 = Ryan | first3 = C. | last4 = Cao | first4 = W. | title = Diagnostic value of HMGAs, p53 and β-catenin in discriminating adenocarcinoma from adenoma or reactive atypia in ampulla and common bile duct biopsies. | journal = Histopathology | volume = 62 | issue = 5 | pages = 778-87 | month = Apr | year = 2013 | doi = 10.1111/his.12084 | PMID = 23530587 }}
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