1. For the whole treatment period before and after radiochemotherapy (for radiochemotherapy see dosing scheme below): 50% of the recommended maximum doses in dependence of body weight according to SmPc: 11-20 kg: ½ tablet every SECOND day (= 40.5 mg CQ phosphate/25 mg CQ every SECOND day); 21-30 kg: 1/2 tablet every day (=40.5 mg CQ phosphate/25 mg CQ every day); 31-40 kg: 1 tablet every day (= 81 mg CQ phosphate/50 mg CQ every day); 41-50 kg: 1 1/2 tablets every day (= 120.5 mg CQ phosphate/75 mg CQ every day); 51-60 kg: 2 tablets every day (= 162 mg CQ phosphate/100 mg CQ every day); 61-70 kg: 2 ½ tablets every day (= 202.5 mg CQ phosphate/125 mg CQ every day). 2. ONLY for the 6-7 weeks of radiochemotherapy: 100% of the recommended maximum doses in dependence of body weight according to SmPc: 11-20 kg: ½ tablet every day (= 40.5 mg CQ phosphate/25 mg CQ every day); 21-30 kg: 1 tablet every day (= 81 mg CQ phosphate/50 mg CQ every day); 31-40 kg: 1 1/2 tablets every day (= 120.5 mg CQ phosphate/75 mg CQ every day); 41-50 kg: 2 tablets every day (= 162 mg CQ phosphate/100 mg CQ every day); 51-60 kg: 2 ½ tablets every day (= 202.5 mg CQ phosphate/125 mg CQ every day); 61-70 kg: 3 tablets every day (= 241.5 mg CQ phosphate/150 mg CQ every day). Before and upon CQ treatment, an opthalmological examination including visus, visual fields, retinal fundus, colour vision, and cornea should at least be performed at treatment start and then every 3 months!