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Home›Trials›Progression of rare connective tissue tumor controlled by targeted therapy

Progression of rare connective tissue tumor controlled by targeted therapy

By Ramoju kishore kumar
December 26, 2018
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A drug called sorafenib stopped progression of desmoid tumors for 80 percent of patients taking the drug over a time of two years as a part of phase 3 trial.

Desmoid tumors which is well known as aggressive fibromatosis. They grow abnormally in the connective tissue and has a capability of impacting anywhere in the body. these tumors are not considered cancerous, because they do not spread to other parts of the body. They do not often cause death, but these tumors can cause significant health problems by invading surrounding tissues, causing pain, limiting mobility, and interfering with organ function. About 1,000 new cases, mostly in young adults, are diagnosed in the U.S. each year.

Desmoid tumors are very complex and display a wide range of behaviors, even in the same patient. Some tumors shrink spontaneously, some remain stable, while still others grow aggressively. Treatment varies from patient to patient. In the past, most patients were treated with surgery, but because there is a high risk that the tumor will return, surgery is now mainly used for tumors that are thought to have a low risk of recurrence. Radiation, chemotherapy, and hormonal treatments are sometimes effective in reducing tumor size and alleviating pain.

In this randomized, double-blinded trial, 87 patients with progressive, symptomatic, or recurrent desmoid tumors were given either oral sorafenib or placebo until scans showed disease progression.

Sorafenib is a targeted therapy that acts on tyrosine kinases — enzymes that have been implicated in cancer development — to inhibit the growth of cancer cells and the formation of new blood vessels that support tumor development. The drug has been approved by the FDA to treat certain types of advanced kidney, liver, and thyroid cancer. It has not yet been approved for the treatment of desmoid tumors.

The study is ongoing, but the researchers estimate that progression-free survival after two years is 81 percent in those taking sorafenib, and only 36 percent in those taking placebo. “This is a truly remarkable outcome,” says Schwartz, who is also a professor of oncology at Columbia University Vagelos College of Physicians and Surgeons. “In fact, we have never seen results like this in the treatment of desmoid tumors.”

Side effects, including rash, hypertension, and diarrhea, were more common in patients taking sorafenib than in those taking placebo.

The study was designed to measure sorafenib’s effect on progression-free survival. It did not address whether the drug led to meaningful improvements in pain or other symptoms.

In addition, 22 percent of patients in the treatment group discontinued therapy due to adverse events, such as fatigue and rash.

Additional clinical trials are needed to identify the optimal dosage to reduce the risk of treatment-related adverse events and determine whether an increase in progression-free survival also leads to improvements in pain relief, function, and quality of life.

Researchers are currently analyzing tumor samples obtained in this trial to better understand how sorafenib affects desmoid tumors at the molecular and cellular levels. Understanding sorafenib’s mechanism of action could lead to the development of additional therapies in the future.

TagsClinical trialsDesmoid tumorsfdaNon Cancerous
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