Antibody-drug conjugate (ADC)
While some of the initial excitement around immunotherapies has waned, companies—particularly smaller biotechs—are developing newer iterations that will take cancer care to the next level.
Pharmaceutical companies are combining antibodies with radioisotopes in a bid to more precisely deliver radiation to cancers and tumors.
Opdivo showed a 52% progression-free survival advantage over Adcetris in newly diagnosed Hodgkin’s lymphoma, according to a Phase III study that combined either therapy with doxorubicin, vinblastine and dacarbazine.
Monday’s failure to improve overall survival in breast cancer “further dents belief” in the companies’ Dato-DXd and “likely complicates regulatory discussions for approval of this indication,” Jefferies analyst Peter Welford wrote in a note to investors.
The European Society for Medical Oncology’s annual meeting this week featured the hottest emergent areas of cancer treatment—antibody-drug conjugates, bispecifics and radiopharmaceuticals—while anti-TIGIT therapies made a bit of a comeback.
Despite meeting the primary endpoint in a Phase III study, two patients treated with Merck and Daiichi Sankyo’s experimental antibody-drug conjugate died in a Phase III non-small cell lung cancer study, though the deaths have not been linked to patritumab deruxtecan.
Despite the disappointing late-stage results in non-small cell lung cancer, Jefferies analyst Stephen Barker contends the likelihood of FDA approval “remains high” for the experimental antibody-drug conjugate, though the regulator is now more likely to convene an advisory committee.
Using a computational biomarker, the companies say they can identify which patients would derive significant clinical benefit from their experimental antibody-drug conjugate. AstraZeneca and Roche are co-developing and commercializing a companion diagnostic for the biomarker.
In June, the regulator placed a partial clinical hold on a Phase I trial of the companies’ antibody-drug conjugate after three patient deaths were reported.
After dropping $4 billion on a deal with the Japanese company last year, Merck is getting back some of its investment as Daiichi Sankyo buys into a Phase I/II T-cell engager therapy acquired from Harpoon Therapeutics.
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