Stress Incontinence Surgery Does Not Cause Pelvic Malignancy: A Population-Based Cohort Study.

PURPOSE We sought to determine if stress urinary incontinence surgery (mesh or nonmesh) is associated with the development of pelvic malignancies later in life. MATERIALS AND METHODS We performed a retrospective cohort study between January 1, 2002 and October 31, 2015 of all women in Ontario, Canada without a history of pelvic malignancy who underwent an index stress incontinence surgery. The primary outcome was a composite of any pelvic malignancy (including urological and gynecological cancers) following stress incontinence surgery. Secondarily, we considered each cancer individually. A survival analysis using a Cox proportional-hazards model with a 3-level categorical exposure (mesh surgery, nonmesh surgery, and control) was performed. Patients were followed until death, emigration or the study end (October 31, 2017). RESULTS Of the women 74,968 underwent stress urinary incontinence surgery during the study period. There were 5,505,576 women in the control group. Over a median followup of 8.5 years (IQR, 5.5-11.9), 587 pelvic malignancies occurred in the surgery group. Women who underwent stress incontinence surgery had a reduced risk of pelvic malignancy independent of surgery type, compared to controls (Wald type 3 p <0.001; mesh HR, 0.68 [95% CI, 0.62-0.76]; p <0.0001; nonmesh HR, 0.37 [95% CI, 0.29-0.46]; p <0.0001). The individual pelvic cancers similarly demonstrated a reduced risk of malignancy following stress incontinence surgery. CONCLUSIONS At a median followup of 8.5 years, women had no increased risk of pelvic malignancy following either mesh or nonmesh stress urinary incontinence surgery in a large population-based cohort.