4678
Both PPC - 1 and ALVA - 31 cells display tumorigenesis and invasiveness in nude mice , whereas LNCap cells exhibit a less malignant phenotype , suggesting a correlation between CD44 variant ( CD44v ) expression and aggressive prostate tumor behavior .
 GENE: CD44 variant; GENE: CD44v
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: CD44 variant, CD44v 
Answer:
 GENE: CD44 variant; GENE: CD44v