 ii Part 2a dexanabinol monotherapy: Chemotherapy or radiotherapy within 4 weeks 6 weeks for nitrosoureas or mitomycin C prior to Cycle 1, Day 1 for solid tumours with the exception of hydroxyurea, which must be discontinued at least 24 hours prior to Cycle 1, Day 1. Localised palliative radiotherapy is permitted for symptom control. 