Antibody-drug conjugate (ADC)

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.

GSK is seeking to relaunch Blenrep after its market withdrawal in 2022. The pharma is eyeing a second-line niche for the antibody-drug conjugate in the treatment of relapsed or refractory multiple myeloma.