1962
The NM23 gene has been proposed as a metastasis-suppressor gene , and its use has been suggested as prognostic factor .
 ( DNA: NM23 gene, None) , ( DNA: metastasis-suppressor gene, 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:
 ( DNA: NM23 gene, None) , ( DNA: metastasis-suppressor gene, None) 