Successful treatment of tetralogy of Fallot with pulmonary atresia using a pulmonary homograft.

A 13-year-old boy with tetralogy of Fallot and pulmonary atresia after a Waterston and Blalock-Taussig shunt underwent successful repair using a cryopreserved pulmonary homograft as a valved extracardiac conduit. Aortic transection gave a good operative field for pulmonary angioplasty and closure of the Waterston anastomosis. The cryopreserved pulmonary homograft provided excellent handling characteristics.

Presence of HLA-D/DR antigens on the membrane of breast tumour cells.

HLA-D/DR (Ia) glycoproteins were identified in human breast carcinoma and normal mammary gland cells by means of an anti-Ia monoclonal antibody. Two techniques were used: (1) immunoperoxidase staining performed on histological sections and (2) Ia glycoproteins were isolated as follows: firstly by radioactive labelling of isolated cells, then by filtration on Sephadex G25, followed by Lens culinaris chromatography, and immune complex formation and then elution on protein A-Sepharose. Lastly, the immune complex was studied by chromatofocusing.

[In vitro cloning of human tumor stem cells].

This study summarizes a one-year work experience in the area of human tumor stem cells cloning techniques. We found that it was more advisable to use an enzymatic method for dissociating solid tumors. The breast tumors possessing an unfavourable histoprognostic grade were found to grow up more easily in culture, which is a confirmation of known relationships between cell differentiation degree and cell proliferation.