FLT1 and neoplasm: Tumor weight in Clo/liposome + SIRPα-Fc group was 580.02 + 76.82 mg versus 236.86 + 39.45 mg of PBS/liposome + SIRPα-Fc group (P < 0.001), and tumor weight in Clo/liposome + VEGFR1-Fc + SIRPα-Fc group was 355.78 + 98.91 mg versus 67.54 + 41.18 mg of PBS/liposome + VEGFR1-Fc + SIRPα-Fc group (P < 0.001).