We have devised a new cell culture method where two types of culture plates made of normal tissue culture plastic (NTCP) and Primaria(TM), and two media, RPMI-1640 and a serum-free media LHC-9(TM), are used in combination with an in situ harvest. Multiple culture conditions in combination with in situ harvest has yielded many more clones for karyotyping than was possible with previous methods. Cells were cultured in 60 mm Petri plates instead of flasks and harvested in situ. Chromosome banding was performed using a highly purified trypsin "Enzar-T(TM)" and Leishman stain instead of ordinary trypsin and Giemsa stain. These modifications have increased the number of clones retrieved, rate of culture success, and quality of karyotypes in solid tumors.
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