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Kaneko Y, Yamatsugu K, Yamashita T, Takahashi K, Tanaka T, Aki S, Tatsumi T, Kawamura T, Miura M, Ishii M, Ohkubo K, Osawa T, Kodama T, Ishikawa S, Tsukagoshi M, Chansler M, Sugiyama A, Kanai M, Katoh H. Pathological complete remission of relapsed tumor by photo-activating antibody-mimetic drug conjugate treatment. Cancer Sci 2022; 113:4350-4362. [PMID: 36121618 DOI: 10.1111/cas.15565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 08/12/2022] [Accepted: 08/23/2022] [Indexed: 02/03/2023] Open
Abstract
Antibody-mimetic drug conjugate is a novel noncovalent conjugate consisting of an antibody-mimetic recognizing a target molecule on the cancer cell surface and low-molecular-weight payloads that kill the cancer cells. In this study, the efficacy of a photo-activating antibody-mimetic drug conjugate targeting HER2-expressing tumors was evaluated in mice, by using the affibody that recognize HER2 (ZHER2:342 ) as a target molecule and an axially substituted silicon phthalocyanine (a novel potent photo-activating compound) as a payload. The first treatment with the photo-activating antibody-mimetic drug conjugates reduced the size of all HER2-expressing KPL-4 xenograft tumors macroscopically. However, during the observation period, relapsed tumors gradually appeared in approximately 50% of the animals. To evaluate the efficacy of repeated antibody-mimetic drug conjugate treatment, animals with relapsed tumors were treated again with the same regimen. After the second observation period, the mouse tissues were examined histopathologically. Unexpectedly, all relapsed tumors were eradicated, and all animals were diagnosed with pathological complete remission. After the second treatment, skin wounds healed rapidly, and no significant side effects were observed in other organs, except for occasional microscopic granulomatous tissues beneath the serosa of the liver in a few mice. Repeated treatments seemed to be well tolerated. These results indicate the promising efficacy of the repeated photo-activating antibody-mimetic drug conjugate treatment against HER2-expressing tumors.
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Affiliation(s)
- Yudai Kaneko
- Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan.,Medical & Biological Laboratories Co., Ltd, Tokyo, Japan
| | - Kenzo Yamatsugu
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Takefumi Yamashita
- Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan
| | - Kazuki Takahashi
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Toshiya Tanaka
- Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan
| | - Sho Aki
- Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan
| | - Toshifumi Tatsumi
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Takeshi Kawamura
- Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan.,Isotope Science Center, The University of Tokyo, Tokyo, Japan
| | - Mai Miura
- Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan
| | - Masazumi Ishii
- Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan
| | - Kei Ohkubo
- Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Osaka, Japan.,Institute for Advanced Co-Creation Studies, Osaka University, Osaka, Japan
| | - Tsuyoshi Osawa
- Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan
| | - Tatsuhiko Kodama
- Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan
| | - Shumpei Ishikawa
- Department of Preventive Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | | | | | - Akira Sugiyama
- Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan.,Isotope Science Center, The University of Tokyo, Tokyo, Japan
| | - Motomu Kanai
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Hiroto Katoh
- Department of Preventive Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
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