WASHINGTON — Patterns in the private student-lending industry are dangerously similar to those seen in the housing market prior to its collapse, according to a study expected to be released Friday by the Consumer Financial Protection Bureau.

The study, completed with the Department of Education under a mandate in the Dodd-Frank Act, said the private student loan market — fueled by eased underwriting and investors interested in asset-backed securities — grew 185% between 2001 and 2008 to $20 billion. Yet that market then deflated over the next three years, falling below $7 billion in 2011. Outstanding private student loans now total about $150 billion, compared with $864 billion in federal student loan debt.

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