摘要：Lanatoside C has a promising anti-tumor activity and is a potential candidate for radiosensitizers. In this study, we have investigated the therapeutic efficacy of the combination of
131I-trastuzumab and lanatoside C for inhibition of human epidermal growth factor receptor 2 (HER2) positive tumor progression in NCI-N87 xenograft model. The combination treatment (
131I-trastuzumab and lanatoside C) showed highest cytotoxicity when compared to non-treated control or trastuzumab alone or
131I alone or
131I-trastuzumab alone in vitro
. Biodistribution studies using
131I-trastuzumab or combination of
131I-trastuzumab and lanatoside C showed tumor uptake in BALB/c nude mice bearing HER2 positive NCI-N87 tumor xenograft model. The higher tumor uptake was observed in
131I-trastuzumab (19.40 ± 0.04% ID/g) than in the combination of
131I-trastuzumab and lanatoside C (14.02 ± 0.02% ID/g) at 24 h post-injection. Most importantly, an antitumor effect was observed in mice that received the combination of
131I-trastuzumab and lanatoside C (
p = 0.009) when compared to control. In addition, mice received lanatoside C alone (
p = 0.085) or
131I-trastuzumab alone (
p = 0.160) did not significantly inhibit tumor progression compared with control. Taken together, our data suggest that combination of
131I-trastuzumab and lanatoside C might be a potential synergistic treatment for radioimmunotherapy to control the HER2 positive tumor.
