After I treated the subcutaneous xenograft with an antibody conjugated to MMAE, the volume was smaller than that of the control group, but the Ki67 staining was enhanced. MMAE works by arresting the cell cycle at the G2/M phase.
Article Positivity of the Proliferation Marker Ki-67 in Noncycling Cells
The results of the paper show that not all cells containing the Ki-67 antigen are actively proliferating cells, since the investigators have shown that many arrested cells can be positive for Ki-67. They have shown that the cells are positive for Ki-67 even when they are arrested in G1/S or G2/M phase.
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