By Puyaan Singh and Bhanvi Satija (Reuters) -AbbVie shares fell over 12% on Monday after an experimental schizophrenia drug the company acquired last year failed two mid-stage studies, widening rival Bristol Myers Squibb's lead in the market for new treatments for the condition.

“While we are disappointed with the results, we are continuing to analyze the data to determine next steps,” Roopal Thakkar, AbbVie’s chief scientific officer, said in a statement.

AbbVie Inc. shares fell the most in three years after two mid-stage trials of its drug to treat schizophrenia failed to meet their primary goal, a blow to the company’s $8.7 billion acquisition of Cerevel Therapeutics earlier this year.