Author 
          (Year) | 
        No.    of patients | 
        Maintenance    schedule | 
        PFS    or EFS(MR    vs. observation) | 
        OS(MR    vs. Observation) | 
      
      
        | Hochster
          2009 [14]  | 
        387 | 
        Four weekly doses every 6 months for 2    years | 
        64%* vs.    33%
          (3 years) | 
        91% vs. 86% 
          (3 years) | 
      
      
        | Martinelli 2010 [16]  | 
        202 | 
        Single dose at 3, 5, 7 and 9 months  | 
        24 months*    vs. 13 months | 
        Difference not statistically    significant | 
      
      
        | Salles
          2011 [12]  | 
        1217 | 
        Single dose every 2 months for 2 years | 
        75%* vs.    58%
          (3 years) | 
        Not significantly different between    the two arms | 
      
      
        | Vitolo
          2011 [15]  | 
        242 | 
        Single dose every 2 months for 4 doses  | 
        80% versus 68%
          (2 years) | 
        No data available | 
      
    
      Abbreviations: MR: Maintenance Rituximab; OS: Overall Survival; PFS: Progression
    Free Survival