“…Although the number of samples was too small for a definite evaluation, a high CTC count was associated with colony formation ( Figure 2 ). Approximately 30 studies on short-term cultures of CTC were subsequently published ( Table 3 and Table 4 [ 7 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 ]). Ten of these studies were by the same research group and used the same method [ 35 , 36 , 37 , 38 , 39 , 40 , 44 , 45 , 47 , 51 ].…”