Exhibit C

Joint Filing Statement

I, the undersigned, hereby express my agreement that the attached Schedule 13D (and any amendments thereto) relating to the beneficial ownership by the undersigned of the equity securities of Pacira Pharmaceuticals, Inc. is filed on behalf of each of the undersigned.

Date: February 17, 2011

MPM BioVentures IV GP LLC
By:	MPM BioVentures IV LLC,
	its Managing Member
By:	/s/ Vaughn M. Kailian
Name:	Vaughn M. Kailian
Title:	Member
MPM BioVentures IV LLC
By:	/s/ Vaughn M. Kailian
Name:	Vaughn M. Kailian
Title:	Member
MPM BioVentures IV-QP, L.P.
By:	MPM BioVentures IV GP LLC, its General Partner
By:	MPM BioVentures IV LLC, its Managing Member
By:	/s/ Vaughn M. Kailian
Name:	Vaughn M. Kailian
Title:	Member
MPM BioVentures IV GmbH & Co. Beteiligungs KG
By:	MPM BioVentures IV GP LLC, in its capacity as the Managing Limited Partner
By:	MPM BioVentures IV LLC, its Managing Member
By:	/s/ Vaughn M. Kailian
Name:	Vaughn M. Kailian
Title:	Member
MPM Asset Management Investors BV4 LLC
By:	MPM BioVentures IV LLC
	Its: Manager
By:	/s/ Vaughn M. Kailian
Name:	Vaughn M. Kailian
Title:	Member

By:	/s/ Ansbert Gadicke
Name:	Ansbert Gadicke
By:	/s/ Luke Evnin
Name:	Luke Evnin
By:	/s/ Steven St. Peter
Name:	Steven St. Peter
By:	/s/ William Greene
Name:	William Greene
By:	/s/ James Paul Scopa
Name:	James Paul Scopa
By:	/s/ Ashley Dombkowski
Name:	Ashley Dombkowski
By:	/s/ Vaughn M. Kailian
Name:	Vaughn M. Kailian
By:	/s/ John Vander Vort
Name:	John Vander Vort