TY - JOUR
T1 - Effective treatment of ductal carcinoma in situ with a HER-2-targeted alpha-particle emitting radionuclide in a preclinical model of human breast cancer
AU - Yoshida, Takahiro
AU - Jin, Kideok
AU - Song, Hong
AU - Park, Sunju
AU - Huso, David L.
AU - Zhang, Zhe
AU - Liangfeng, Han
AU - Zhu, Charles
AU - Bruchertseifer, Frank
AU - Morgenstern, Alfred
AU - Sgouros, George
AU - Sukumar, Saraswati
PY - 2016/5/31
Y1 - 2016/5/31
N2 - The standard treatment for ductal carcinoma in situ (DCIS) of the breast is surgical resection, followed by radiation. Here, we tested localized therapy of DCIS in mice using the immunoconjugate 225Ac linked-trastuzumab delivered through the intraductal (i.duc) route. Trastuzumab targets HER-2/neu, while the alpha-emitter 225Ac (half-life, 10 days) delivers highly cytotoxic, focused doses of radiation to tumors. Systemic 225Ac, however, elicits hematologic toxicity and at high doses free 213Bi, generated by its decay, causes renal toxicity. I.duc delivery of the radioimmunoconjugate could bypass its systemic toxicity. Bioluminescent imaging showed that the therapeutic efficacy of intraductal 225Ac-trastuzumab (10-40 nCi per mammary gland; 30-120 nCi per mouse) in a DCIS model of human SUM225 cancer cells in NSG mice was significantly higher (p<0.0003) than intravenous (120 nCi per mouse) administration, with no kidney toxicity or loss of body weight. Our findings suggest that i.duc radioimmunotherapy using 225Ac-trastuzumab deserves greater attention for future clinical development as a treatment modality for early breast cancer.
AB - The standard treatment for ductal carcinoma in situ (DCIS) of the breast is surgical resection, followed by radiation. Here, we tested localized therapy of DCIS in mice using the immunoconjugate 225Ac linked-trastuzumab delivered through the intraductal (i.duc) route. Trastuzumab targets HER-2/neu, while the alpha-emitter 225Ac (half-life, 10 days) delivers highly cytotoxic, focused doses of radiation to tumors. Systemic 225Ac, however, elicits hematologic toxicity and at high doses free 213Bi, generated by its decay, causes renal toxicity. I.duc delivery of the radioimmunoconjugate could bypass its systemic toxicity. Bioluminescent imaging showed that the therapeutic efficacy of intraductal 225Ac-trastuzumab (10-40 nCi per mammary gland; 30-120 nCi per mouse) in a DCIS model of human SUM225 cancer cells in NSG mice was significantly higher (p<0.0003) than intravenous (120 nCi per mouse) administration, with no kidney toxicity or loss of body weight. Our findings suggest that i.duc radioimmunotherapy using 225Ac-trastuzumab deserves greater attention for future clinical development as a treatment modality for early breast cancer.
KW - Breast cancer
KW - Ductal carcinoma in situ
KW - Intraductal
KW - Radioimmunotherapy
KW - Trastuzumab
UR - http://www.scopus.com/inward/record.url?scp=84973539295&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84973539295&partnerID=8YFLogxK
U2 - 10.18632/oncotarget.8949
DO - 10.18632/oncotarget.8949
M3 - Article
C2 - 27119227
AN - SCOPUS:84973539295
SN - 1949-2553
VL - 7
SP - 33306
EP - 33315
JO - Oncotarget
JF - Oncotarget
IS - 22
ER -