Former President Barack Obama, who won office by defeating McCain in the 2008 election, offered his support in a Twitter message: "John McCain is an American hero & one of the bravest fighters I've ever known. Cancer doesn't know what it's up against. Give it hell, John."

McCain was elected to the U.S. Senate in 1986. His absence from Washington this week had forced McConnell to delay planned action on health-care legislation.

Glioblastoma is a particularly aggressive cancer that forms tumors in the brain and spinal cord, according to the American Brain Tumor Association. The same form of cancer was a prime cause of the death in 2009 of Senator Ted Kennedy, a brother of the assassinated former U.S. President John F. Kennedy.

The American Cancer Society estimates that people who develop glioblastoma after the age of 55 have a five-year survival rate of four percent.

美国亚利桑那州凤凰城的梅奥医院星期三说，美国联邦参议员约翰·麦凯恩被诊断出患有脑癌。

80岁的麦凯恩参议员上星期做手术摘除了左眼上方一个5厘米大小的血栓后发现了恶性肿瘤。

梅奥医院说，随后的组织病理学分析发现了与血栓有关的恶性胶质瘤。

麦凯恩办公室发表声明说：“麦凯恩参议员的医生说，他术后恢复极好，整体健康状况不错。跟梅奥医疗小组协商后，将决定他何时能重返参议院。”

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