The recent U.S study has shown that focused radiation can control the spread of cancer.

Researchers claim that the targeted radiation therapy can free patients from traces of cancer.

Researchers analyzed the data collected from ongoing clinical trails. Patients with stage- IV cancer with one to five distant metastases were included in the trails. The study included 29 patients with 56 cancerous lesions. Researchers found that targeted radiation therapy cured all signs of cancer in 21% patients.

Targeted radiation therapy eradicated 31 out of the 56 tumors. Two tumors responded moderately. Hence, total tumor volume decreased by 31 percent. During clinical trails only three out of the 56 tumors progressed growing in size by 20 percent. The study showed that increase in radiation dose can improve tumor control.

The study was done by researchers from the University of Chicago Medical Center. The study's senior author, Dr. Ralph Weichselbaum, a professor of radiation and cellular oncology said, "This was proof of principle in patients who had failed the standard therapies and had few, if any, remaining options. We had encouraging results, including several long-term survivors, in patients with stage-IV cancers that had spread to distant sites."

Researchers claimed that the patients tolerated the treatment with “limited difficulty.” There were no serious side effects except some fatigue. They said that this therapy can also used to eradicate a few larger tumors in those cases where chemotherapy has eliminated most the smaller cancer.