Tumor-targeting Salmonella typhimurium A1-R in combination with trastuzumab eradicates HER-2-positive cervical cancer cells in patient-derived mouse models

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Abstract

We have previously developed mouse models of HER-2-positive cervical cancer. Tumors in nude mice had histological structures similar to the original tumor and were stained by anti-HER-2 antibody in the same pattern as the patient's cancer. We have also previously developed tumor-targeting Salmonella typhimurium A1-R and have demonstrated its efficacy against patient-derived tumor mouse models, both alone and in combination. In the current study, we determined the efficacy of S. typhimurium A1-R in combination with trastuzumab on a patient-cancer nude-mouse model of HER-2 positive cervical cancer. Mice were randomized to 5 groups and treated as follows: (1) no treatment; (2) carboplatinum (30 mg/kg, ip, weekly, 5 weeks); (3) trastuzumab (20 mg/kg, ip, weekly, 5 weeks); (4) S. typhimurium A1-R (5 × 10<sup>7</sup> CFU/body, ip, weekly, 5 weeks); (5) S. typhimurium A1-R (5 × 10<sup>7</sup> CFU/body, ip, weekly, 5 weeks) + trastuzumab (20 mg/kg, ip, weekly, 5 weeks). All regimens had significant efficacy compared to the untreated mice. The relative tumor volume of S. typhimurium A1-R + trastuzumab-treated mice was smaller compared to trastuzumab alone (p = 0.007) and S. typhimurium A1-R alone (p = 0.039). No significant body weight loss was found compared to the no treatment group except for carboplatinum-treated mice (p = 0.021). Upon histological examination, viable tumor cells were not detected, and replaced by stromal cells in the tumors treated with S. typhimurium A1-R + trastuzumab. The results of the present study suggest that S. typhimurium A1-R and trastuzumab in combination are highly effective against HER-2-expressing cervical cancer.

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Hiroshima, Y., Zhang, Y., Zhao, M., Zhang, N., Murakami, T., Maawy, A., … Hoffman, R. M. (2015). Tumor-targeting Salmonella typhimurium A1-R in combination with trastuzumab eradicates HER-2-positive cervical cancer cells in patient-derived mouse models. PLoS ONE, 10(6). https://doi.org/10.1371/journal.pone.0120358

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