814
When data obtained preoperatively and after 12 months were compared, it was found that out of 23 patients whose PBMCs had experienced a drop in their PHA -induced proliferation , 14 (61%) had developed metastatic disease within the subsequent 24 months (i.e. 36 months after surgery).
 ( cell type: PBMCs, None) , ( protein: PHA, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell type: PBMCs, None) , ( protein: PHA, None) 