It depends on the verbiage in the lease itself. Your best bet would be to talk to a landlord tenant attorney to find out your legal rights.
Mitchell S. Feldman
Associate Broker/ Director of Sales/ e-Pro Realtor
Fillmore Real Estate
Office: (718) 252-2000/ Cell: (917) 805-0783
after you read all the FINE PRINT ...normally you are responsible for the full term. However, what is your reason for ending your lease. Is it a good one? Did you lose your job? You could ask them directly, maybe they will negotiate with you.It never hurts to ask...
otherwise follow everything else that was mentioned by my fellow co-agents.