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Breakthrough in bladder cancer research

2023-11-16
(Press-News.org) After 40 years of treating metastatic bladder cancer with chemotherapy as a primary treatment, scientists now present a new approach using immunotherapy combinations. The results of not just one, but two studies have been presented at the European Society for Medical Oncology (ESMO) conference in Madrid. The outcomes of these studies are going to revolutionize the landscape of bladder cancer treatment.

Traditionally, cisplatin-based chemotherapy has been the standard treatment for bladder cancer patients who are able to tolerate this drug. However, responses have been limited, and durable outcomes rare. Over the past years, two phase-3 clinical trials studied the effects of combining immunotherapy with either chemotherapy or a new drug, enfortumab vedotin, to treat bladder cancer (more exact: urothelial carcinoma). With success, both studies show a significant increase in both overall survival as well as progression-free survival.

Medical oncologist Michiel van der Heijden from the Netherlands Cancer Institute (NKI) explains: “these results mark a milestone in bladder cancer research, providing the first evidence of a survival benefit of combination therapy involving immune checkpoint inhibitors over chemotherapy. This is an exciting development in our field, as these findings will thoroughly change the treatment landscape for advanced bladder cancer. It is a testament to the collaborative efforts of researchers, and most importantly, the resilience of all patients who participated in this study."

Combining therapies

The CheckMate 901 trial investigated a new combination of the drugs nivolumab and gemcitabine-cisplatin and compared this to treatment with only chemotherapy. The results demonstrated that patients treated with both drugs showed a 22% reduction in the risk of death compared to patients only treated with chemotherapy. The findings also showed that the combination of nivolumab and chemotherapy led to a significant improvement in progression-free survival vs chemotherapy alone.

The results will be published in the esteemed New England Journal of Medicine at the same time as the presentation at ESMO. 

During this ESMO presidential session, the results of another phase-3 in the same treatment line will be presented, featuring a novel combination of an antibody-drug conjugate with immune checkpoint inhibition, using Enfortumab Vedotin + pembrolizumab. This study found a statistically significant and clinically meaningful improvement in overall survival and progression-free survival as well. These results will be published in a scientific journal at a later time.

Both treatments are yet to be registered and approved in the Netherlands for  health insurance coverage, meaning that they will not yet be readily available. In the US, the Enfortumab Vedotin + pembrolizumab is already available for a subgroup of bladder cancer patients, based on a phase 2 study.

Unique

Michiel van der Heijden is involved in both these trials, making it a special occasion for the NKI to have such a leading role in two large studies that can change clinical practice. “It is very special to give a presidential lecture during ESMO. I have not had this honor before and it may very well not happen again anytime soon. Last year was a very special occasion as well, as two NKI researchers, Myriam Chalabi and John Haanen, both presented their findings in the presidential session. Not many researchers have received this honor, making this a really unique moment for the NKI once again.”

END


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[Press-News.org] Breakthrough in bladder cancer research