Tissue: Brain; Derived from metastatic site: bone marrow. Modal number = 44, XX; Most cells were monosomic for chromosomes 10, 11, 13, 14 and 19; All cells were missing both copies of chromosome 2; Five marker chromosomes of unknown origin were observed in each cell. One of the marker chromosomes contains a homogeneously staining region (HSR); No double minutes were seen.