Study to Evaluate Optimized Retreatment and Prolonged Therapy With Bortezomib

Type= exact number, unit = mg/m2 body surface area, number = 1.3, form = powder for solution for injection, route = subcutaneous, injection on Days 1, 4, 8 and 11, every 21 days of cycle 1 and 2; injection on Days 1, 8, 15, 22, every 35 days for cycles 3 to 6; followed by injections on Days 1, 8, 15, 22 every 35 days (Group A1) or injections every other week (Group A2). Treatment will be stopped at confirmed disease progression

Type= exact number, unit = mg, number = 20, form = tablet, route = oral, intake on Days 1, 2, 4, 5, 8, 9, 11 and 12, every 21 days of cycle 1 and 2; intake on Days 1, 2, 8, 9, 15, 16, 22 and 23 every 35 days for cycles 3 to 6

Type= exact number, unit = mg/m2 body surface area, number = 1.3, form = powder for solution for injection, route = subcutaneous, injection on Days 1,4,8,11, every 21 days for cycles 1 to 8 or until confirmed disease progression

Type = exact number, unit = mg, number = 20, form = tablet, route= oral, intake on Days 1, 2, 4, 5, 8, 9, 11, 12, every 21 days for cycles 1 to 8 or until confirmed disease progression