Task: Answer Verification
Input (English): Question: Does endostatin exert radiosensitizing effect in non-small cell lung cancer cells by inhibiting VEGFR2 expression?
Answer: Endostatin induces apoptosis and enhances radiosensitivity of the VEGFR2 high-expressing cell line Calu-1, but it has a limited effect on the VEGFR2 low-expressing cell line A549.
Output (English): yes