Abbrev.	Definition
BCT	Breast Conservative Therapy
IvBC	Invasive Breast Cancer
DCIS	Ductal Carcinoma in situ
PM	Partial Mastectomy
M	Mastectomy
M + R	Mastectomy with reconstruction
OPS	Oncoplastic Surgery
M + I	Mastectomy with breast prosthesis, delayed-insertion or tissue expander for implant placement
M + MF	Mastectomy with Muscular Flap
MLR	Multivariable Logistical Regression
R2	Linear Regression
ACS	American College of Surgeons
NSQIP	National Surgical Quality Improvement Program
CPT	Current Procedural Terminology
ICD-9	International Classification of Diseases Ninth Revision
CG	Categories