4513
At 4 wk however , tumor relapse was noted in 6 of 7 group 4 responders , 10 of 12 in group 5 , 13 of 16 in group 7 , but only 4 of 19 group 8 responders ( p less than . 001 group 8 versus 4 , 5 , 7 ) .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None