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Inhibition of DNA excision repair can modulate resistance to cisplatin. Cytosine arabinoside (Ara-C) and hydroxyurea (HU), in combination, inhibit the excision-repair system and removal of platinum-DNA adducts. Marked cytotoxic synergy had been demonstrated in vitro at clinically achievable levels. The three-drug regimen was found to be feasible in clinical pilot studies. A Phase II study in patients...
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