| 
      
        |  | Plating Efficiency | Doubling Time |  | D10 Value | RBE |  
        | Cell | (%) | (h) | Assay | X-ray | C-ion | (X-ray/C-ion) |  
        | MCF-7 | 29.3 ± 7.9 | 24 | CFA | 3.0 ± 0.4 | 1.0 ± 0.1 | 3.0 |  
        |  |  |  | HDS | 4.7 ± 0.5 | 1.5 ± 0.1 | 3.1 |  
        | BT474 | <1.0 | 48 | CFA | NC | NC | NC |  
        |  |  |  | HDS | 7.6 ± 0.7 | 3.2 ± 0.3 | 2.4 |  
        | SK-BR-3 | 15.0 ± 6.6 | 30 | CFA | NC | NC | NC |  
        |  |  |  | HDS | 6.5 ± 1.0 | 1.9 ± 0.4 | 3.4 |  
        | MDA-MB-468 | 5.8 ± 4.4 | 24 | CFA | NC | NC | NC |  
        |  |  |  | HDS | 5.0 ± 0.2 | 1.8 ± 0.1 | 2.8 |  
        | HCC1937 | <1.0 | 40 | CFA | NC | NC | NC |  
        |  |  |  | HDS | 3.0 ± 0.5 | 0.8 ± 0.1 | 3.3 |  
        | MCF10DCIS.com | 47.5 ± 8.9 | 12 | CFA | 2.5 ± 0.1 | 1.1 ± 0.2 | 2.3 |  
        |  |  |  | HDS | 6.0 ± 0.1 | 2.3 ± 0.1 | 2.6 |  |