Interphone also released results on only two types of brain tumors: meningioma and glioma.
Shortly after, doctors diagnosed a brain tumor -- a malignant glioma in his left parietal lobe.
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Friedman has done extensive research on glioblastoma, the most aggressive form of malignant glioma.
The brain tumor research center at Duke is conducting several clinical trials in malignant glioma.
About 10, 000 to 15, 000 Americans receive a diagnosis of malignant glioma each year.
The tumor is a malignant glioma located in Kennedy's left parietal lobe about at the top of the head.
Glioma is a terrible cancer, and if we could reduce the number of cases through simple means it would be worth it.
FORBES: Why You Still Shouldn't Worry About Cellphones And Cancer
Doctors at Seattle Children's Hospital diagnosed an optic glioma, or a tumor growing around the nerve that connects the eye to the brain.
Malignant glioma is the most common type of adult brain cancer.
It showed participants in the study who used a cell phone for 10 years or more had doubled the rate of brain glioma, a type of tumor.
And there really is no certainty about the cellphone-glioma link.
FORBES: Why You Still Shouldn't Worry About Cellphones And Cancer
Certain epidemiologic studies (mainly from a single group in Sweden) indicate an elevated risk of glioma (the most malignant type of brain cancer) in long-term users of cell phones.
Conducted under the auspices of the World Health Organization, it interviewed more than 5, 000 people afflicted with glioma or meningioma brain tumors, along with a control group, from 13 countries.
The WHO said that the classification was mainly due to a study that showed heavy cellphone use might cause a 40% increased risk of glioma, a type of brain tumor.
FORBES: Why You Still Shouldn't Worry About Cellphones And Cancer
Hardell has been a vocal promoter of his results as indicating that long-term cell phone use appears to be associated with increased risk of glioma, the most fatal type of brain tumor.
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But the rate of glioma over the past 35 years has actually remained pretty much flat, and actually decreased slightly, according to Otis Brawley, the chief medical officer of the American Cancer Society.
FORBES: Why You Still Shouldn't Worry About Cellphones And Cancer
Interphone began by gathering a group of people who had had the cancers of interest (glioma, meningioma, acoustic neurinoma and parotid gland tumour) and questioning them about their past use of mobile phones.
While it is too soon to tell whether it works, the oncologist leading the effort, Michael Jensen at City of Hope National Medical Center near Los Angeles, is so hopeful that he aims to test similar treatments within a year in children with leukemia and glioma, an aggressive brain tumor.
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