13097
Here , we will discuss the clinical relevance of vitamin B6 metabolism as a prognostic factor in cancer patients . Oncogene advance online publication , 21 January 2013 ; doi : 10 . 1038 / onc . 2012 . 623 .
 vitamin B6
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 vitamin B6