Three of the nation's largest banks reported lackluster third-quarter earnings Thursday, reinforcing analysts' concerns that sluggish revenue growth, rising costs, and problems in consumer lending could soon take their toll on the industry.

Cleveland-based KeyCorp posted a 1% profit decline, to $207 million; it blamed both flat revenues and rising expenses. Bankers Trust New York Corp., meanwhile, reported a 14% gain, to $176 million, driven largely by the retirement of preferred stock and sale of an insurance unit.

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