Karyotype:Hyperdiploid. Modal number = 48, range = 42 to 58. The rate of higher ploidies was 1.6%.Nine markers were common to all cells. These were: t(1q4q), del(5)(q31,q33), der(9)t(4,9)(q11,p24), t(8q12p), t(9q13q) and four others. Double minutes (DM) were seen in some cells (usually only one copy). Normal N9 was absent, N4, N8, and N13 were consistently single-copied and the x was double-copied.