Methionine dependency of malignant tumors: a possible approach for therapy.

Abstract excerpt

When methionine (Met), an essential amino acid, was substituted for by its precursor homocysteine (Hcy) in the culture medium, normal cells such as fibroblasts proliferated normally. In contrast, many tumor cells failed to grow or grew at a lower rate. Met dependency is acquired simultaneously with cell transformation, as observed with HBL 100, a human mammary epithelial cell line that acquired increased...

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