BOSTON (AP) — Sen. Edward M. Kennedy has a malignant brain tumor.

Doctors for the Massachusetts Democrat say tests conducted after Kennedy suffered a seizure this weekend show a tumor in his left parietal lobe. Preliminary results from a biopsy of the brain identified the cause of the seizure as a malignant glioma, they said.

His treatment will be decided after more tests but the usual course includes combinations of radiation and chemotherapy.

The 76-year-old senator has been hospitalized in Boston since Saturday, when he was airlifted from Cape Cod after a seizure at his home.

His wife and children have been with him each day but have made no public statements.

His doctors said in a statement released to The Associated Press that he has had no further seizures, is in good spirits and is resting comfortably.

Malignant gliomas are a type of brain cancer diagnosed in about 9,000 Americans a year — and the most common type among adults. It’s a starting diagnosis: How well patients fare depends on what specific tumor type is determined by further testing.

Average survival can range from less than a year for very advanced and aggressive types — such as glioblastomas — or to about five years for different types that are slower growing.