- 搜标题
- 搜题干
- 搜选项
多项选择题
Which of the following factors may work on mechanisms of tumor escape?
A．A. antigenic modulation
B．B. immune inhibitors secreted by tumor cells
C．C. activation of macrophages
D．D. lack of co-stimulatory molecules on the tumor cells
E．E. absence of MHC class II molecule
B．B. immune inhibitors secreted by tumor cells
C．C. activation of macrophages
D．D. lack of co-stimulatory molecules on the tumor cells
E．E. absence of MHC class II molecule
