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A colonoscopy was performed, showing unspecific inflammatory changes of the colonic mucosa, and a gastroscopy was performed, revealing a gastric neoplasia and antral gastropathy of which biopsies were taken. The gastric biopsy histology confirmed a neoplastic proliferation with solid pattern suggestive of GIST, and the immunohistochemistry was positive for CD117. AA amyloid deposits were observed in biopsies of the gastric mucosa, the tumour and the colonic mucosa.</p><p class="elsevierStylePara">The patient subsequently showed lower limb oedema and diarrhoea. The analytical tests showed: haemoglobin 8.7g/dl, haematocrit 28%, mean corpuscular volume 75, serum creatinine 1.3mg/dl, total protein 5.9g/dl, albumin 1.36g/dl, cholesterol 96mg/dl, transferrin saturation index 13%, proteinuria 5.1g/day and sediment with 4-6 red blood cells/high power field. Given the poor condition of the patient, renal biopsy was not performed and it was assumed that amyloidosis previously observed in gastrointestinal biopsies was responsible for the nephrotic syndrome and diarrhoea. Cardiac amyloidosis was excluded by echocardiogram.</p><p class="elsevierStylePara">Treatment was initiated with 100mg/day of selective cKit tyrosine kinase inhibitor, Imatinib (Glivec<span class="elsevierStyleSup">®</span>). 15 months after diagnosis, surgical removal was decided after observing a reduction in the tumour mass in the study by positron emission tomography/computerised tomography. The pathological anatomy confirmed the involvement of the removed splenic flexure of the colon and stomach. In this regard, it was classified as a high-risk GIST (>5cm in size, >5 mitosis per high power field).<span class="elsevierStyleSup">2</span></p><p class="elsevierStylePara">Renal function continued to deteriorate, and as such, the patient finally began periodic haemodialysis, one year and seven months after the discovery of GIST with the diagnosis of chronic renal failure secondary to AA amyloidosis.</p><p class="elsevierStylePara"><span class="elsevierStyleBold"> </span></p><p class="elsevierStylePara"><span class="elsevierStyleBold">DISCUSSION</span></p><p class="elsevierStylePara"> </p><p class="elsevierStylePara">Amyloidosis is characterised by the deposition of proteinaceous material, which typically has a fibrillar ultrastructure with beta folding, making it insoluble and resistant to proteolytic enzymes. Depending on the fibrillar protein that is deposited, several forms can be distinguished.<span class="elsevierStyleSup">1</span></p><p class="elsevierStylePara">In secondary amyloidosis, the fibrillar protein amyloid A, derived from the precursor serum A (SAA) is deposited, which acts as an acute phase reactant. It is induced by chronic inflammatory diseases such as rheumatoid arthritis and the familial Mediterranean fever or some infections, such as tuberculosis or osteomyelitis. Neoplasias are also an uncommon cause of systemic amyloidosis, especially in renal cell carcinoma or Hodgkin’s disease.<span class="elsevierStyleSup">1,5,6</span></p><p class="elsevierStylePara">GIST constitutes less than 1% of tumours of the digestive system. The most common location is the stomach, but it can be found throughout the entire gastrointestinal tract and adjacent organs. Most have a mutation in the proto-oncogene cKIT (CD117), whose detection confirms diagnosis. Specific inhibitors against the latter have become first-line drugs as coadjuvants to surgery or for tumours that are unresectable due to their extensive proliferation.<span class="elsevierStyleSup">2</span></p><p class="elsevierStylePara">The link between GIST and amyloidosis was initially described by Jaakkola et al.<span class="elsevierStyleSup">3</span> in a 59-year-old male with normal renal function who presented with a pelvic mass, whose histopathology coincided with that of a GIST. Three months later, he displayed renal function deterioration and began periodic haemodialysis. AA amyloidosis was found in the renal biopsy. Later, Overstreet et al.<span class="elsevierStyleSup">4</span> described the case of a 69-year-old male who was diagnosed with a GIST, with amyloid deposits in the spleen, adrenal glands and liver.</p><p class="elsevierStylePara">Both cases involved a GIST with high mitotic index and large size. Perhaps this is associated with an increased cytokine-mediated inflammatory response and therefore an increased production of SAA protein as an acute phase reactant. Similar hypotheses have been suggested in other cases of amyloidosis linked to tumours. Thus, for example, it is believed that the secretion of interleukin-6 in the germinal centres of lymph nodes could stimulate the synthesis of SAA and be involved in secondary amyloidosis in Castleman’s disease.<span class="elsevierStyleSup">5</span> However, the pathophysiology of the association with GIST is yet to be studied due to its rarity.</p><p class="elsevierStylePara">In conclusion, GIST is an extremely rare cause of secondary amyloidosis that can result in rapidly progressive renal failure that requires renal replacement therapy within a few months. Perhaps a more thorough study of the pathophysiology linking these two entities would open the way for the development of more effective therapeutic tools.</p><p class="elsevierStylePara"> </p><p class="elsevierStylePara"><span class="elsevierStyleBold">Conflicts of interest</span></p><p class="elsevierStylePara"> </p><p class="elsevierStylePara">The authors declare that they have no conflicts of interest related to the contents of this article.</p>" "pdfFichero" => "P1-E557-S4311-A11964-EN.pdf" "tienePdf" => true "bibliografia" => array:2 [ "titulo" => "Bibliography" "seccion" => array:1 [ 0 => array:1 [ "bibliografiaReferencia" => array:6 [ 0 => array:3 [ "identificador" => "bib1" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:3 [ "referenciaCompleta" => "Lachmann HJ, Goodman HJB, Gilbertson JA, Gallimore JR, Sabin CA, Gillmore JD, et al. Natural history and outcome in systemic AA amyloidosis. N Engl J Med 2007;356:2361-71. <a href="http://www.ncbi.nlm.nih.gov/pubmed/17554117" target="_blank">[Pubmed]</a>" "contribucion" => array:1 [ 0 => null ] "host" => array:1 [ 0 => null ] ] ] ] 1 => array:3 [ "identificador" => "bib2" "etiqueta" => "2" "referencia" => array:1 [ 0 => array:3 [ "referenciaCompleta" => "Xiaohui Zhao, Changjun Yuc. Gastrointestinal stromal tumour. J Gastrointest Oncol 2012;3:189-208. <a href="http://www.ncbi.nlm.nih.gov/pubmed/22943011" target="_blank">[Pubmed]</a>" "contribucion" => array:1 [ 0 => null ] "host" => array:1 [ 0 => null ] ] ] ] 2 => array:3 [ "identificador" => "bib3" "etiqueta" => "3" "referencia" => array:1 [ 0 => array:3 [ "referenciaCompleta" => "Jaakkola H, Tornoth T, Groop PH, Honkanen E. Renal failure and nephritic syndrome associated with gastrointestinal stromal tumour (GIST)-a rare cause of AA amyloidosis. Nephrol Dial Transplant 2001;16:1517-8. <a href="http://www.ncbi.nlm.nih.gov/pubmed/11427662" target="_blank">[Pubmed]</a>" "contribucion" => array:1 [ 0 => null ] "host" => array:1 [ 0 => null ] ] ] ] 3 => array:3 [ "identificador" => "bib4" "etiqueta" => "4" "referencia" => array:1 [ 0 => array:3 [ "referenciaCompleta" => "Overstreet K, Barone RM, Robin HS. Secondary amyloidosis and gastrointestinal tumours. A case report and discussion of pathogenesis. Arch Pathol Lab Med 2003;127:470-3." "contribucion" => array:1 [ 0 => null ] "host" => array:1 [ 0 => null ] ] ] ] 4 => array:3 [ "identificador" => "bib5" "etiqueta" => "5" "referencia" => array:1 [ 0 => array:3 [ "referenciaCompleta" => "Bestard Matamoros O, Poveda Monje R, Ibernon Vilaró M, Carrera Plans M, Grinyó Boira JM. Amiloidosis secundaria (AA) asociada a tumoraciones benignas. Nefrologia 2008;28:93-8. <a href="http://www.ncbi.nlm.nih.gov/pubmed/18336138" target="_blank">[Pubmed]</a>" "contribucion" => array:1 [ 0 => null ] "host" => array:1 [ 0 => null ] ] ] ] 5 => array:3 [ "identificador" => "bib6" "etiqueta" => "6" "referencia" => array:1 [ 0 => array:3 [ "referenciaCompleta" => "Onishi S, Hojo N, Sakai I, Matsumoto T, Watanabe A, Miyazaki T, et al. Secondary amyloidosis and eosinophilia in a patient with uterine leyomiosarcoma. Jpn J Clin Oncol 2005;35:617-21. <a href="http://www.ncbi.nlm.nih.gov/pubmed/16172171" target="_blank">[Pubmed]</a>" "contribucion" => array:1 [ 0 => null ] "host" => array:1 [ 0 => null ] ] ] ] ] ] ] ] ] "idiomaDefecto" => "en" "url" => "/20132514/0000003300000004/v0_201502091629/X2013251413052615/v0_201502091630/en/main.assets" "Apartado" => array:4 [ "identificador" => "35437" "tipo" => "SECCION" "en" => array:2 [ "titulo" => "Letters to the Editor - Brief Case Reports" "idiomaDefecto" => true ] "idiomaDefecto" => "en" ] "PDF" => "https://static.elsevier.es/multimedia/20132514/0000003300000004/v0_201502091629/X2013251413052615/v0_201502091630/en/P1-E557-S4311-A11964-EN.pdf?idApp=UINPBA000064&text.app=https://revistanefrologia.com/" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/X2013251413052615?idApp=UINPBA000064" ]
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