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[A case of iatrogenic immunodeficiency-associated lymphoproliferative disease in a patient treated with methotrexate for rheumatoid arthritis for 9 consecutive years, which Showed natural remission after discontinuation of MTX therapy]. Gan To Kagaku Ryoho (Cancer Chemother) 40: 2454-2456, 2013 (in Japanese, Abstract in English)."},{"key":"18","doi-asserted-by":"crossref","unstructured":"18. Takeuchi C, lshikawa A, Endo M, et al. A case of MTX-LPD with gastric ulcerative lesion. Prog Dig Endosc 82: 120-121, 2013 (in Japanese, Abstract in English).","DOI":"10.11641\/pde.82.1_120"},{"key":"19","unstructured":"19. Ikeda K, Nakamura T, Kinoshita T, et al. Methotrexate-related lymphoproliferative disorder of the stomach in a patient with rheumatoid arthritis: a case of disease regression after methotrexate cessation. Clin J Gastroenterol 9: 17-21, 2016."},{"key":"20","unstructured":"20. Shiomi H, Watanabe E, Umeda T, et al. A case report of perforated gastric malignant lymphoma. 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