25040
To more fully characterize the role of PDGFR alpha in the regulation of tumor stroma , we evaluated the in vivo antitumor effects of MEDI - 575 in tumor - bearing SCID mice and in genetically altered SCID mice expressing human PDGFR alpha in place of murine PDGFR alpha .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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