Comparison of tumor specimen from MM precursor lesions , primary tumors , and metastases revealed that CD40 surface expression is down-regulated during tumor progression .
comparison of tumor specimen from mm precursor lesions , primary tumors , and metastases revealed that cd40 surface expression is down-regulated during tumor progression .
O O B-tissue I-tissue O B-tissue I-tissue I-tissue O B-tissue I-tissue O O B-other_name O O B-protein_molecule O O O O O B-other_name I-other_name O