BOSTON — Senator Kennedy said it was “good to be home” after flying back to Massachusetts today, one week after undergoing an aggressive and delicate surgery to treat a cancerous brain tumor.

Mr. Kennedy left the Duke University Medical Center in Durham, N.C., this morning and arrived at his family’s compound at Hyannis Port on Cape Cod just before noon.

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Kennedy, who was wearing a hat, told reporters waiting outside his home it was “good to be home, good to be here.”

When asked how he was feeling, he said, “Glad to be home, I’ll tell ya.”

The Massachusetts Democrat was diagnosed last month with a malignant glioma, a lethal type of brain tumor, after having a seizure. A malignant glioma is one of the worst kinds of brain cancer, and malignant gliomas are diagnosed in about 9,000 Americans a year.

“His doctors are pleased with his progress since surgery a week ago, and he will continue to recuperate at home before starting the next phase of his treatment,” Mr. Kennedy’s office said in a statement. “He is thankful for the extraordinary care of the doctors and nurses at Duke, and also for the continued prayers and well wishes from the people of Massachusetts and all over the country.”

Mr. Kennedy, 76, underwent the risky, 3½-hour surgery last Monday to remove as much of the tumor as possible, a procedure aimed at improving the success of chemotherapy and radiation. His surgeon at Duke, Dr. Allan Friedman, said today that Mr. Kennedy “is making an excellent recovery.”

“He will continue his recuperation at home in Massachusetts under the supervision of the very capable doctors at the Massachusetts General Hospital,” Dr. Friedman said in a statement.

Mr. Kennedy’s son, Rep. Patrick Kennedy, a Democrat of Rhode Island, told the Providence Journal yesterday that his father’s surgery “went better than anyone expected.” He said his father is looking forward to returning to the Senate and working with Democratic presidential nominee Senator Obama on universal health care legislation should the Illinois senator win the White House.

“That is what he is talking and thinking about,” Mr. Kennedy said. “It adds a great deal of poignancy to his recovery. But that’s how he sees it — he has to recover so he can get health care for the millions of people who don’t have access to the care that we do.”

Mr. Kennedy told the newspaper that his father wants to begin writing the legislation this year so it would be ready if Mr. Obama was victorious.

Mr. Kennedy’s family and doctors have released few details about the particular type of tumor, which plays a key role in determining his survival odds. Some cancer specialists have said Mr. Kennedy appears to have a glioblastoma multiforme — a serious and tough-to-remove type of tumor — because other kinds are more common in younger people.

Doctors familiar with the type of surgery have said it almost never leads to a cure, but radiation or chemotherapy treatments have a better chance of success because there’s less tumor to fight.

“The senator and his wife Vicki are wonderful people, and I hope you will join me in wishing them the best as they continue their difficult journey to fight this disease,” Dr. Friedman said. “Their courageous and positive attitude is a lesson for us all.”