title: Pulmonary thrombotic microangiopathy caused by gastric carcinoma.
abstract: Pulmonary tumour thrombotic microangiopathy (PTTM) is characterised by wide spread tumour emboli along with fibrocellular intimal proliferation and thrombus formation in small pulmonary arteries and arterioles. PTTM is a rare but fatal complication of carcinoma, but the pathogenesis remains to be clarified. An autopsy case of PTTM caused by gastric adenocarcinoma is described, in which tumour cells in the PTTM lesion had positive immunoreactivity for platelet-derived growth factor (PDGF) and PDGF receptor (PDGFR), and proliferating fibromuscular intimal cells also showed expression of PDGFR. In addition, the overexpression of PGDF was detected in the alveolar macrophages. These findings suggest that PDGF derived from alveolar macrophages and from tumour cells may act together in promoting fibrocellular intimal proliferation. To the best of the authors' knowledge, the possible involvement of activated alveolar macrophages in PTTM has not been previously reported.
authors.affiliation: Department of Tumour and Diagnostic Pathology, Atomic Bomb Disease Institute, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-8523, Japan.
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Yokomine
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Hirakawa
authors.forename: Eisuke
authors.initials: E
authors.lastname: Ozawa
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Shibata
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Nakayama
mesh_terms: D000230:Adenocarcinoma / Q000150:complications*; D017809:Fatal Outcome; D006801:Humans; D016676:Macrophages, Alveolar / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009360:Neoplastic Cells, Circulating / Q000473:pathology*; D010982:Platelet-Derived Growth Factor / Q000378:metabolism; D011655:Pulmonary Embolism / Q000209:etiology* / Q000378:metabolism / Q000473:pathology; D017479:Receptors, Platelet-Derived Growth Factor / Q000378:metabolism; D013274:Stomach Neoplasms / Q000150:complications*; D057049:Thrombotic Microangiopathies / Q000209:etiology* / Q000378:metabolism / Q000473:pathology
chemical_list: D010982:Platelet-Derived Growth Factor; D017479:Receptors, Platelet-Derived Growth Factor