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A procedure is described for short-term cryopreservation of primary human tumor cells and tissue slices for later analysis by flow cytometry. Cells were mechanically dispersed into a freezing medium, which was then frozen at either -20 degrees C or -70 degrees C for delayed cell cycle analysis. The results show that a correlation coefficient of greater than 0.95 exists between cell cycle kinetic analyses performed immediately after surgical excision of the tumor and on cells frozen from 1 to 30 days at -70 degrees C in this freezing solution. Somewhat lower levels of correlation exist for cells frozen at -20 degrees C in this freezing medium. This procedure has also been successfully used to preserve freshly isolated breast carcinoma cells shipped from distant laboratories for analysis in the flow cytometer, thus expanding the data base on certain types of breast carcinoma.
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