 - Risks: NAC is a well known drug, used for over thirty years, that is well tolerated. For intravenous NAC, allergic reactions have been reported. There is also a theoretical risk, that NAC may reduce anti-tumour efficacy of cisplatin, this risk will be theoretically ruled out by appropriate dosing of NAC. After inclusion of the first 30 patients an interim analysis will be performed regarding the tumour response. 