How to recognize at an early stage whether a new cancer therapy prolongs life

	Tweet

Great hopes are always placed in new cancer therapies. However, whether new surgical techniques, drugs or radiation therapies actually prolong the life of cancer patients, or even cure them, can often only be reliably assessed after several years’ of testing. Researchers are therefore looking for proxy markers ("surrogate endpoints”) that after initiation of cancer therapy can reliably predict as quickly as possible whether the treatment has a benefit.

A rapid report published today by the Institute for Quality and Efficiency in Health Care (IQWiG) summarizes the findings of a search for literature on the validation of surrogate endpoints in breast and bowel cancer. The results are ambivalent. On the one hand, operational scientific methods are available to assess the validity of surrogate endpoints (surrogate=substitute). “We propose to apply these methods in the early benefit assessment of drugs,” says Stefan Lange, IQWiG’s Deputy Director.

However, on the other hand it has been shown that these methods have so far not been applied systematically, at least not in breast and bowel cancer. “For these common types of cancer it is therefore currently unclear which surrogate endpoints are suitable to predict a benefit of an intervention,” says Lange. Consequently, patients often do not know what prospects of success a specific cancer treatment offers. 

Predictions for the future

The ideal situation is a different one: cancer therapies should have proven in studies that they can prolong life and at the same time improve (or at least not seriously impair) quality of life. However, as such studies often last for years, cancer drugs are currently approved mostly on the basis of surrogate endpoints. In this context, for example, it is assessed in how many patients a new treatment stops the growth of a cancer or actually causes it to shrink.

“It is a good sign that a cancer is being contained in this way,” says Lange, “but this is no guarantee that a treatment has a benefit.” For example, in some women the drug Avastin® can contain breast cancer for a certain period of time. However, researchers now strongly doubt that this prolongs the life of the women. In view of the side effects that cancer therapies often have, patients could be spared therapies that have no benefit.

Impact on the early benefit assessment of cancer drugs

IQWiG assumes that for the early benefit assessment of new cancer drugs often only studies on surrogate endpoints will be available. “Consequently, conclusions on the benefit and harm of new drugs will be characterized by some degree of uncertainty” says Lange. “However, we now propose a way as to how this uncertainty can be detected and dealt with.”

In order to apply the methods for assessing surrogate endpoints successfully, however, the Institute is dependent on the preparatory work of other researchers. Many long-completed studies on cancer therapies could easily be used to examine systematically the association between surrogate endpoints and the benefit for patients. “It would be ideal if companies and researchers rigorously analysed the surrogate endpoint data currently lying in their drawers and published the results,” says Lange.

Contact: Tel. ++49(0)221-35685-0,
Institute for Quality and Efficiency in Health Care

RELATED STORIES:
Pollution exposure linked to childhood cancer   Exercises Ease Cancer-Related Swallowing Woes Short Term   Many young cancer patients don’t discuss fertility   Focusing Patients on the “Can” in Cancer Diagnosis, Treatment, and Recovery   How cancer cells loose their (Circadian) rhythm   Nanoparticles + Light = Dead Tumor Cells   Black Raspberries May Slow Growth of Colon, Other Cancers   Risk of cancer increases with exposure to low-dose radiation   New device could cut chemotherapy deaths   Parents of kids with cancer face traumatic stress   How Growing Older Affects Cancer Risk and Outcomes   Drug Therapy to Bolster Immune System Cells Found Effective Toward Childhood Cancer   Some tumors contain factors that may block metastasis   Researchers present new findings on cancer and gene therapy   How Infection and Inflammation Can Lead to Cancer   Childhood cancer mortality high in UK in children   Researchers Develop and Improve Techniques for Treating Cancer   Factors that enhance autonomy of cancer patients   Farmers’ kids at risk for Ewing’s sarcoma   New Markers of Prognosis for Cancer Therapies Highlighted   Children Find Ways to Cope with Cancer   Diabetes can increase the risk of developing hepatocellular carcinoma

Comments

[ + Post Your Own ]

Now you're in the public comment zone. What follows is not Armenian Medical Network's stuff; it comes from other people and we don't vouch for it. A reminder: By using this Web site you agree to accept our Terms of Service. Click here to read the Rules of Engagement.

There are no comments for this entry yet. [ + Comment here + ]