1962
The NM23 gene has been proposed as a metastasis-suppressor gene , and its use has been suggested as prognostic factor .
 NM23 gene, metastasis-suppressor gene
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 NM23 gene, metastasis-suppressor gene