Standard Risk R1 Good responders (R1) (< 10% viable tumour cells) with localised disease are allocated to the standard risk arm and will receive a further eight cycles of chemotherapy composed of vincristine, actinomycin D, and cyclophosphamide (VAC) (females) or ifosfamide instead of cyclophosphamide (VAI) (males). They will be randomised to receive add-on treatment with either fenretinide, zoledronic acid, fenretinide plus zoledronic acid, or no add-on treatment.