1498
A chemokine receptor , CXCR4 , and its endogenous ligand , stromal cell - derived factor - 1 ( SDF - 1 ) , have been recognized to be involved in the metastasis of several types of cancers .
 Anatomy: cancers
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: cancers