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Koprowski H, Steplewski Z, Mitchell K, et al. Colorectal carcinoma antigens detected by hybridoma antibodies. Somatic Cell Genet 5: 957-971, 1979.","DOI":"10.1007\/BF01542654"},{"key":"2","unstructured":"2. Steinberg W. The clinical utility of the CA19-9 tumor-associated antigen. Am J Gastroenterol 85: 350-355, 1990."},{"key":"3","unstructured":"3. Ohkura H. CA19-9. Med Technol 19: 200-201, 1991 (in Japanese)."},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. Murohisa T, Sugaya H, Tetsuka I, et al. A case of common bile duct stone with cholangitis presenting an extraordinarily high serum CA19-9 value. Intern Med 31: 516-520, 1992.","DOI":"10.2169\/internalmedicine.31.516"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5. Kitahara S, Ueda K, Ozawa T, et al. Occurrence of extremely high level of serum carbohydrate antigen 19-9 in a patient sufferring from cholecystitis with stones, and liver abscess. Jpn J Gastroenterol Surg 23: 2644-2647, 1990 (in Japanese).","DOI":"10.5833\/jjgs.23.2644"},{"key":"6","doi-asserted-by":"crossref","unstructured":"6. Ohkawa A, Kamegashira M, Akamatsu H, et al. A case of markedly elevated serum CA19-9 with choledocholithiasis. Jpn J Gastroenterol Surg 26: 1085-1089, 1993 (in Japanese).","DOI":"10.5833\/jjgs.26.1085"},{"key":"7","doi-asserted-by":"crossref","unstructured":"7. Kohno Y, Kawaguchi T, Imai S, et al. A case of cholecystolithiasis with choledocholithiasis which showed abnormally increased tumor markers. J Jpn Soc Clin Surg 54: 751-755, 1993 (in Japanese).","DOI":"10.3919\/ringe1963.54.751"},{"key":"8","unstructured":"8. Kato M, Makino T, Kuroki K, et al. A case of cholelithiasis with extremely high value of CA19-9. J Clin Surg 48: 129-131, 1994 (in Japanese)."},{"key":"9","doi-asserted-by":"crossref","unstructured":"9. Funamoto S, Kigawa S, Hirai S, et al. A case of xanthogranuiomatous cholecystitis with markedly increased level of serum CA19-9. Jpn J Gastroenterol Surg 28: 1848-1852, 1995 (in Japanese).","DOI":"10.5833\/jjgs.28.1848"},{"key":"10","unstructured":"10. Itano S, Terada N, Hashimoto S, et al. A case report of acute obstructive suppurative cholangitis with elevated CA19-9. J Biliary Tract Pancreas 17: 957-961, 1996 (in Japanese)."},{"key":"11","unstructured":"11. Oshita H, Tanaka S, Tanemura H, et al. A case report on cholecysto-choledocholithiasis with high values of CA19-9 much more than 10,000 U\/mL in serum. Surgery 61: 217-220, 1999 (in Japanese)."},{"key":"12","unstructured":"12. Peterli R, Meyer-Wyss B, Herzog U, et al. CA19-9 has no value as a tumor marker in obstructive jaundice. Schweiz Med Wochenschr 129: 77-79, 1999."},{"key":"13","unstructured":"13. Okamoto K, Goto Y, Katano M, et al. Gallstone with abnormally high serum values of CA19-9. J Tokyo Med Univ 59: 473-478, 2001."},{"key":"14","doi-asserted-by":"crossref","unstructured":"14. Akashi S, Yamamoto M, Hosoi T, et al. A case of cholecystitis with markedly elevated level of serum CA19-9. Jpn J Gastroenterol Surg 40: 438-443, 2007 (in Japanese).","DOI":"10.5833\/jjgs.40.438"},{"key":"15","doi-asserted-by":"crossref","unstructured":"15. Sasaki T, Kobayashi S, Koizumi S, et al. A case of cholelithiasis and choledocholithiasis with abnormally high value of CA19-9. J Jpn Sur Assoc 70: 1465-1470, 2009 (in Japanese).","DOI":"10.3919\/jjsa.70.1465"},{"key":"16","doi-asserted-by":"crossref","unstructured":"16. Marcouizos G, Ignatiadou E, Papanikolaou GE, et al. Highly elevated serum levels of CA 19-9 in choledocholithiasis: a case report. Cases J 2: 6662, 2009.","DOI":"10.4076\/1757-1626-2-6662"},{"key":"17","unstructured":"17. Matsumoto Y, Abe Y, Sasagawa S, et al. A case of extraordinarily high serum CA19-9 levels with cholecystitis and gallbladder perforation. J Jpn Biliary Assoc 27: 822-827, 2013 (in Japanese)."},{"key":"18","doi-asserted-by":"crossref","unstructured":"18. Akimoto S, Banshodani M, Nishihara M, et al. Acute cholecystitis with significantly elevated levels of serum carbohydrate antigen 19-9. Case Rep Gastroenterol 10: 410-416, 2016.","DOI":"10.1159\/000448068"},{"key":"19","doi-asserted-by":"crossref","unstructured":"19. Oinuma S, Yoshio D, Omotaka S, et al. A case of acute cholecystitis with abnormally high CA19-9. Surg Case Rep 9: 69, 2023.","DOI":"10.1186\/s40792-023-01648-1"},{"key":"20","doi-asserted-by":"crossref","unstructured":"20. Sheen-Chen SM, Sun CK, Liu YW, et al. Extremely elevated CA19-9 in acute cholangitis. 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