title: Blood cells with fetal haemoglobin (F-cells) detected by immunohistochemistry as indicators of solid tumours.
abstract: OBJECTIVE
  Fetal hemoglobin (HbF) is an established serological indicator of cancer. However, its distribution in tumour tissues is rarely investigated. Therefore, HbF was studied immunohistologically in different cancers characterised by high blood HbF concentrations.
  
  
  METHODS
  Anti-HbF was immunoaffinity purified and used to study HbF immunohistochemically in the following cancers: germ cell tumour (GCT), trophoblastic disease (TD), lymphoma, myelodysplastic syndrome (MDS), multiple myeloma (MM), and ovarian adenocarcinoma (OA).
  
  
  RESULTS
  In GCT a distinction was made between tumours substantially without HbF positive red blood cells (F-RBC) and those with F-RBC. Those without F-RBC were non-metastatic mature teratomas and dermoid cysts. Those containing F-RBC were mainly embryonal carcinomas and metastatic teratomas. HbF positive myeloid cells (F-MLC), HbF positive normoblasts (F-NBS), and F-RBC were common in the bone marrow and in the lymphoid tissues of lymphoma, MDS, and MM. In TD, normal and nucleated F-RBC were seen in the trophoblastic villi in one case with incomplete molar pregnancy (ICM) but not in other cases of ICM and complete molar pregnancy. However, F-RBC and F-MLC were seen in the decidua of both types of TD. Generally, F-cells were observed either within blood vessels or concentrated in certain areas of the neoplastic tissue.
  
  
  CONCLUSIONS
  HbF was evaluated as an inducible marker within different tumour tissue blood cells. The dual distribution of these cells-circulating in the blood or concentrated in areas of the neoplastic tissues-might reflect the two independent serological indicators of HbF: one in whole blood and the other in plasma of patients with cancer.
authors.affiliation: Department of Morbid Anatomy and Histopathology, The Royal London Hospital, Central Laboratory, Israel Ministry of Health, Jerusalem 91342, Israel. moshe.wolk@eliav.health.gov.il
authors.forename: M
authors.initials: M
authors.lastname: Wolk
authors.forename: J E
authors.initials: JE
authors.lastname: Martin
authors.forename: R
authors.initials: R
authors.lastname: Constantin
mesh_terms: D014408:Biomarkers, Tumor / Q000097:blood*; D005260:Female; D005319:Fetal Hemoglobin / Q000032:analysis*; D019337:Hematologic Neoplasms / Q000097:blood; D006801:Humans; D007106:Immune Sera / Q000276:immunology; D007124:Immunoenzyme Techniques; D008297:Male; D009363:Neoplasm Proteins / Q000097:blood; D009369:Neoplasms / Q000097:blood*; D009373:Neoplasms, Germ Cell and Embryonal / Q000097:blood; D010051:Ovarian Neoplasms / Q000097:blood
chemical_list: D014408:Biomarkers, Tumor; D007106:Immune Sera; D009363:Neoplasm Proteins; D005319:Fetal Hemoglobin