GSK Reports Promising Early Results for Ovarian and Womb Cancer Drug

GSK has revealed promising early results for its treatment for gynaecological cancers, Mocertatug Rezetecan (Mo-Rez), as its chief executive, Luke Miels, seeks to speed up drug development at the group.

The company reported that in an early-stage trial, Mo-Rez shrank or eliminated tumours in 62% of patients with ovarian cancer where chemotherapy had failed, and in 67% of those with endometrial cancer.

GSK acquired the Mo-Rez cancer treatment, an antibody-drug conjugate (ADC), from China’s Hansoh Pharma in late 2023, and has trialled it in 224 patients around the world, including the UK, over the past year. Few patients needed to stop treatment because of side-effects, the most common being nausea. It is administered every three weeks via intravenous infusion.

Combined with data from a separate, intermediate trial in China, these results give GSK the confidence to go straight to late-stage trials, with five clinical studies planned globally in the next few months, including on patients in the UK.

Presenting the results at the Society of Gynecologic Oncology’s annual meeting on women’s cancer in Puerto Rico, Hesham Abdullah, GSK’s global head of cancer research and development, said: “Treatment of gynaecological cancers remains a major challenge, with a pressing need for new therapies that offer improved response rates. With Mo-Rez we now have compelling evidence of a promising clinical profile.”

Endometrial cancer affects 1.6 million women globally, with 417,000 new cases each year. Ovarian cancer affects 843,000 people, with 240,000 new cases annually.

Abdullah described Mo-Rez as a “key asset” in the company’s growing cancer portfolio, expected to be a blockbuster drug with peak annual sales of more than £2bn, which GSK hopes will help it achieve its 2031 sales target of £40bn.