LDH isozymes were assayed by polyacrylamide gel electrophoresis in 6 long-term transplantable skin tumours in Syrian hamsters. The percentages of the M-subunits were as follows: in a slow growing fibrosarcoma with abortive differentiation and producing lung metastases -- 63.3; in two well differentiated squamous cell carcinomas with moderate growth -- 79.8 and 74.9; in a slow growing and metastasizing melanotic melanoma -- 67.7; in undifferentiated amelanotic and depigmented melanomas with very fat growth -- 72.8 and 77.4. Therefore no consistent relationship has emerged between histogenesis, growth rate, differentiation and metastases of the studied neoplasms from one side and their LDH isozyme pattern -- on the other.
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