Chronic Treatment of an Advanced Prostate-cancer Patient With Oral Methioninase Resulted in Long-term Stabilization of Rapidly Rising PSA Levels
Qinghong Han, Robert M. Hoffman
Abstract
BACKGROUND/AIM: Advanced prostate cancer is a recalcitrant disease with very limited treatment options. Our laboratory discovered methionine addiction, presumably a characteristic of all cancer types, including prostate cancer, which can be targeted by methionine restriction (MR), through treatment with oral recombinant methioninase (o-rMETase). PATIENTS AND METHODS: o-rMETase was produced by fermentation of recombinant E. coli containing the Pseudomonas putida methioninase gene, and purified by column chromatography. An advanced prostate cancer patient received o-rMETase as a supplement, 500 units per day, divided into two oral doses of 250 units each. RESULTS: week of o-rMETase administration, the PSA levels stabilized at 62 ng/ml. No overt side effects were observed. CONCLUSION: o-rMETase single treatment can be beneficial for advanced prostate cancer patients.