Strategic alliances are helping subprime lenders cash in on mainstream interest in the market. "We’ve had tremendous growth," said Megan Mahoney, executive vice president of American Business Mortgage Services, of the company’s bank alliance program. A subsidiary of Philadelphia-based American Business Financial Services, ABMS earlier this month announced the addition of Comerica Bank to its stable of partners. The Comerica deal brings to 30 the number of banks in the alliance program.