Teresa Heinz Kerry at Mass General tonight after being rushed to Nantucket hospital this afternoon

Teresa Heinz Kerry, leading philanthropist and wife of US Secretary of State John F. Kerry, was at Massachusetts General Hospital tonight after being rushed this afternoon to Nantucket Cottage Hospital, where a hospital spokesman had said she was in critical but stable condition.

Heinz Kerry, 74, was stricken while at the family’s vacation home, according to State Department spokesman Glen Johnson.

“Late Sunday afternoon, Mrs. Teresa Heinz Kerry was taken by ambulance to Nantucket Cottage Hospital, accompanied by her husband,” Johnson said in a prepared statement. “Once doctors had stabilized her condition, she was transferred to Massachusetts General Hospital in Boston, again accompanied by the Secretary.”

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Johnson did not provide further details of her condition, saying “the family is grateful for the outpouring of support it has received and aware of the interest in her condition, but they ask for privacy at this time.”

Shortly after 5:30 p.m., Noah Brown, public information officer for Nantucket Cottage Hospital, confirmed in a brief phone interview that Heinz Kerry had arrived at the hospital that afternoon.

“She was brought in, in critical but stable condition, and that is currently how ... her condition still remains,” Brown said shortly after 5:30 p.m. “At this point, we are determining the next phase of her care, be that either in our facility on the island, or on the mainland.”

Heinz Kerry was diagnosed with breast cancer in September 2009 and underwent surgery and radiation treatments. She has publicly encouraged other women to get regular mammograms to help enable early detection of the disease.

Since Kerry resigned from the Senate to become secretary of state in January, she has traveled with him on several of his foreign trips.

It was unclear Sunday how her condition would affect her husband’s official duties in the coming days.

He is scheduled to hold meetings in Washington this week on the US relationship with China and has been overseeing sensitive negotiations to try to persuade Israel and the Palestinians to resume long-dormant peace talks.