1967
Moreover, cell lines derived from tumours of patients with a disease-free survival of more than 24 months (24-58 months) express the NM23 gene at higher levels than cell lines obtained from melanomas of patients with a disease-free survival of less than 24 months (6-15 months).
 ( protein: NM23, None) , ( DNA: NM23 gene, None) , ( cell line: cell lines, None) , ( cell line: cell lines, 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:
 ( protein: NM23, None) , ( DNA: NM23 gene, None) , ( cell line: cell lines, None) , ( cell line: cell lines, None) 