The nature of the cardiac myxoma.
Ten archive cases of cardiac myxoma were evaluated for proliferative activity, metastatic potential and expression of oncogene/tumor suppressor gene products by means of PCNA, MIB1, nm23, p53, Bcl-2 and Rb-1 immunohistochemistry. The myxomas showed variable proliferative activity (PCNA 0-41%, average 12.6%, MIB1 0-13%, average 3.2%) contrasting with the absence of mitotic activity histologically. All the myxomas showed nm23 staining. None showed p53 reactivity. Eight cases were negative for Bcl-2 expression, with two cases giving weak cytoplasmic staining. Rb-1 reactivity showed a variable pattern (staining indices 0-86%) paralleling the cases' proliferative activity. The cardiac myxoma is interpreted as a weakly proliferative lesion with little metastatic potential and no modulation of oncogene/oncogene suppressor products. Whilst not excluding a neoplastic aetiology, the results are considered more in keeping with a reactive/hamartomatous process.
Suvarna
S K
SK
Department of Histopathology, Northern General Hospital, Sheffield, UK.
Royds
J A
JA
D000328:Adult; D014408:Biomarkers, Tumor / Q000378:metabolism*; D002455:Cell Division; D005260:Female; D006338:Heart Neoplasms / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D019394:Ki-67 Antigen / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D020559:Monomeric GTP-Binding Proteins; D009232:Myxoma / Q000378:metabolism* / Q000473:pathology; D054778:NM23 Nucleoside Diphosphate Kinases; D009701:Nucleoside-Diphosphate Kinase; D018809:Proliferating Cell Nuclear Antigen / Q000378:metabolism; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism; D016160:Retinoblastoma Protein / Q000378:metabolism; D014157:Transcription Factors / Q000378:metabolism; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism
D014408:Biomarkers, Tumor; D019394:Ki-67 Antigen; D054778:NM23 Nucleoside Diphosphate Kinases; D018809:Proliferating Cell Nuclear Antigen; D019253:Proto-Oncogene Proteins c-bcl-2; D016160:Retinoblastoma Protein; D014157:Transcription Factors; D016159:Tumor Suppressor Protein p53; C517938:NME1 protein, human; D009701:Nucleoside-Diphosphate Kinase; D020559:Monomeric GTP-Binding Proteins