FIGURE 5. Effect of ¹¹¹In-DTPA (A) and octreotide (B) on clonogenic cell survival of CA20948 cells. Cells were incubated for 1 h in increasing amount of ¹¹¹In-DTPA (same amount was given as was used with [¹¹¹In-DTPA]octreotide [Fig. 4]). Amount of radioactivity that is normally attached to cells was added to medium after 1-h incubation. ¹¹¹In-DTPA was also added when medium was refreshed after 3 d. Bars represent mean ± SEM.