DXD - CAS1599440-33-1 Catalog number: BADC-01394

DXD - CAS1599440-33-1 Catalog number: BADC-01394

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DXD, an Exatecan derivative for ADC, is a potent DNA topoisomerase I inhibitor with an IC50 of 0.31 μM. It can be used as a payload for antibody-conjugated drug ADCs targeting HER2.

ADCs Cytotoxin
Product Name
Catalog Number
Molecular Formula
Molecular Weight

Ordering Information

Catalog Number Size Price Quantity
BADC-01394 25 mg $1999
BADC-01394 1 g $23940
DXD, an Exatecan derivative for ADC, is a potent DNA topoisomerase I inhibitor with an IC50 of 0.31 μM. It can be used as a payload for antibody-conjugated drug ADCs targeting HER2.
Canonical SMILES
1.57±0.1 g/cm3 (Predicted)
Soluble in DMSO
In Vitro
Dxd is a potent DNA topoisomerase I inhibitor, with an IC50 of 0.31 μM, used as a conjugated drug of HER2-targeting ADC (DS-8201a). Dxd is cytotoxic to human cancer cell lines of KPL-4, NCI-N87, SK-BR-3, and MDA-MB-468 with IC50s of 1.43 nM-4.07 nM, but the control IgG-ADC (Dxd is the payload) shows no inhibition on the four cell lines (with HER2 expression). DS-8201a (Dxd is the payload) displays significant suppression on the HER2-positive KPL-4, NCI-N87, and SK-BR-3 cell lines, with IC50 values of 26.8, 25.4, and 6.7 ng/mL, respectively, but with no such inhibition on MDA-MB-468 (IC50, >10,000 ng/mL).
In Vivo
DS-8201a (Dxd is the payload, 10 mg/kg, i.v.) shows potent antitumor activity in HER2-positive models with KPL4, JIMT-1, and Capan-1 and in HER2 low-expressing ST565 and ST313 models with HER2 IHC 1+/FISH-negative expression.
Clinical Trial Information
NCT NumberCondition Or DiseasePhaseStart DateSponsorStatus
NCT04379596Gastric CancerPhase 22021-11-11AstraZenecaRecruiting
NCT05034887Gastric AdenocarcinomaPhase 22021-09-05National Cancer Center Hospital EastNot yet recruiting
NCT04989816Gastric or Gastroesophageal Junction (GEJ) AdenocarcinomaPhase 22021-11-18AstraZenecaRecruiting
NCT04556773Metastatic Breast CancerPhase 12021-11-18AstraZenecaRecruiting
NCT04526691Advanced or Metastatic NSCLCPhase 12021-10-22Daiichi Sankyo, Inc.Recruiting
Solid Powder
-20°C (International: -20°C)
Store at 2-8°C for short term (days to weeks) or -20°C for long term (months to years)
Boiling Point
957.9±65.0°C (Predicted)
1.A HER2-Targeting Antibody-Drug Conjugate, Trastuzumab Deruxtecan (DS-8201a), Enhances Antitumor Immunity in a Mouse Model
Iwata TN, Ishii C, Ishida S, Ogitani Y, Wada T, Agatsuma T
Trastuzumab deruxtecan (DS-8201a), a HER2-targeting antibody-drug conjugate with a topoisomerase I inhibitor exatecan derivative (DX-8951 derivative, DXd), has been reported to exert potent antitumor effects in xenograft mouse models and clinical trials. In this study, the immune system-activating ability of DS-8201a was assessed. DS-8201a significantly suppressed tumor growth in an immunocompetent mouse model with human HER2-expressing CT26.WT (CT26.WT-hHER2) cells. Cured immunocompetent mice rejected not only rechallenged CT26.WT-hHER2 cells, but also CT26.WT-mock cells. Splenocytes from the cured mice responded to both CT26.WT-hHER2 and CT26.WT-mock cells. Further analyses revealed that DXd upregulated CD86 expression on bone marrow-derived dendritic cells (DC) in vitro and that DS-8201a increased tumor-infiltrating DCs and upregulated their CD86 expression in vivo DS-8201a also increased tumor-infiltrating CD8+ T cells and enhanced PD-L1 and MHC class I expression on tumor cells. Furthermore, combination therapy with DS-8201a and anti-PD-1 antibody was more effective than either monotherapy. In conclusion, DS-8201a enhanced antitumor immunity, as evidenced by the increased expression of DC markers, augmented expression of MHC class I in tumor cells, and rejection of rechallenged tumor cells by adaptive immune cells, suggesting that DS-8201a enhanced tumor recognition by T cells. Furthermore, DS-8201a treatment benefited from combination with anti-PD-1 antibody, possibly due to increased T-cell activity and upregulated PD-L1 expression induced by DS-8201a.
2.DS-8201a, a new HER2-targeting antibody-drug conjugate incorporating a novel DNA topoisomerase I inhibitor, overcomes HER2-positive gastric cancer T-DM1 resistance
Takegawa N, Nonagase Y, Yonesaka K, Sakai K, Maenishi O, Ogitani Y, Tamura T, Nishio K, Nakagawa K, Tsurutani J
Anti-HER2 therapies are beneficial for patients with HER2-positive breast or gastric cancer. T-DM1 is a HER2-targeting antibody-drug conjugate (ADC) comprising the antibody trastuzumab, a linker, and the tubulin inhibitor DM1. Although effective in treating advanced breast cancer, all patients eventually develop T-DM1 resistance. DS-8201a is a new ADC incorporating an anti-HER2 antibody, a newly developed, enzymatically cleavable peptide linker, and a novel, potent, exatecan-derivative topoisomerase I inhibitor (DXd). DS-8201a has a drug-to-antibody-ratio (DAR) of 8, which is higher than that of T-DM1 (3.5). Owing to these unique characteristics and unlike T-DM1, DS-8201a is effective against cancers with low-HER2 expression. In the present work, T-DM1-resistant cells (N87-TDMR), established using the HER2-positive gastric cancer line NCI-N87 and continuous T-DM1 exposure, were shown to be susceptible to DS-8201a. The ATP-binding cassette (ABC) transporters ABCC2 and ABCG2 were upregulated in N87-TDMR cells, but HER2 overexpression was retained. Furthermore, inhibition of ABCC2 and ABCG2 by MK571 restored T-DM1 sensitivity. Therefore, resistance to T-DM1 is caused by efflux of its payload DM1, due to aberrant expression of ABC transporters. In contrast to DM1, DXd payload of DS-8201a inhibited the growth of N87-TDMR cells in vitro. This suggests that either DXd may be a poor substrate of ABCC2 and ABCG2 in comparison to DM1, or the high DAR of DS-8201a relative to T-DM1 compensates for increased efflux. Notably, N87-TDMR xenograft tumor growth was prevented by DS-8201a. In conclusion, the efficacy of DS-8201a as a treatment for patients with T-DM1-resistant breast or gastric cancer merits investigation.
3.Wide application of a novel topoisomerase I inhibitor-based drug conjugation technology
Ogitani Y, Abe Y, Iguchi T, Yamaguchi J, Terauchi T, Kitamura M, Goto K, Goto M, Oitate M, Yukinaga H, Yabe Y, Nakada T, Masuda T, Morita K, Agatsuma T
To establish a novel and widely applicable payload-linker technology for antibody-drug conjugates (ADCs), we have focused our research on applying exatecan mesylate (DX-8951f), a potent topoisomerase I inhibitor, which exhibits extensive antitumor activity as well as significant myelotoxicity, as the payload part. Through this study, we discovered a promising exatecan derivative (DX-8951 derivative, DXd), that has the characteristics of low membrane permeability and shows considerably less myelotoxicity than that shown by exatecan mesylate in an in vitro human colony forming unit-granulocyte macrophage assay. DXd was further used for drug conjugation by using commercially or clinically useful monoclonal antibodies to evaluate the potency of the ADC. The result revealed that the DXd-ADCs targeting CD30, CD33, and CD70 were effective against each of their respective target-expressing tumor cell lines. Moreover, a novel DXd-ADC targeting B7-H3, which is a new target for ADCs, also showed potent antitumor efficacy both in vitro and in vivo. In conclusion, this study showed that this novel topoisomerase I inhibitor-based ADC technology is widely applicable to a diverse number of antibodies and is expected to mitigate myelotoxicity, thereby possibly resulting in better safety profiles than that of existing ADC technologies.
The molarity calculator equation

Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)

The dilution calculator equation

Concentration (start) × Volume (start) = Concentration (final) × Volume (final)

This equation is commonly abbreviated as: C1V1 = C2V2

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