Interstitial pneumonitis related to trastuzumab deruxtecan, a human epidermal growth factor receptor 2-targeting Ab-drug conjugate, in monkeys.

Published on Nov 2, 2020in Cancer Science
· DOI :10.1111/CAS.14686
Kazuyoshi Kumagai7
Estimated H-index: 7
(Daiichi Sankyo),
Tetsuo Aida6
Estimated H-index: 6
(Daiichi Sankyo)
+ 3 AuthorsKazuhiko Mori9
Estimated H-index: 9
(Daiichi Sankyo)
Source
Abstract
Trastuzumab deruxtecan (T-DXd: DS-8201a) is an anti-human epidermal growth factor receptor 2 (HER2) Ab-drug conjugated with deruxtecan (DXd), a derivative of exatecan. The objective of this study was to characterize T-DXd-induced lung toxicity in cynomolgus monkeys. Trastuzumab deruxtecan was injected i.v. into monkeys once every 3 weeks for 6 weeks (10, 30, and 78.8 mg/kg) or for 3 months (3, 10, and 30 mg/kg). To evaluate the involvement of DXd alone in T-DXd-induced toxicity, DXd monohydrate was given i.v. to monkeys once a week for 4 weeks (1, 3, and 12 mg/kg). Interstitial pneumonitis was observed in monkeys given T-DXd at 30 mg/kg or more. The histopathological features of diffuse lymphocytic infiltrates and slight fibrosis were similar to interstitial lung diseases (ILD)/pneumonitis related to anticancer drugs in patients, with an incidence that was dose-dependent and dose-frequency-dependent. Monkeys receiving DXd monohydrate did not suffer lung toxicity, although the DXd exposure level was higher than that of DXd in the monkeys given T-DXd. The HER2 expression in monkey lungs was limited to the bronchial level, although the lesions were found at the alveolar level. Immunohistochemical analysis confirmed that T-DXd localization was mainly in alveolar macrophages, but not pulmonary epithelial cells. These findings indicate that monkeys are an appropriate model for investigating T-DXd-related ILD/pneumonitis. The results are also valuable for hypothesis generation regarding the possible mechanism of T-DXd-induced ILD/pneumonitis in which target-independent uptake of T-DXd into alveolar macrophages could be involved. Further evaluation is necessary to clarify the mechanism of ILD/pneumonitis in patients with T-DXd therapy.
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