Cancer occurrence after cosmetic breast implantation in Denmark

Area of Science:

• Oncology
• Plastic Surgery
• Epidemiology

Background:

• Most breast implant studies focus on breast cancer risk, neglecting other cancer sites.
• Investigating cancer incidence beyond breast cancer is crucial for understanding implant safety.

Purpose of the Study:

• To examine cancer incidence in women with cosmetic breast implants, focusing on various cancer sites.
• To compare cancer risk between women receiving implants in private clinics versus public hospitals and controls.

Main Methods:

• A cohort study followed 1,653 women with cosmetic breast implants from Danish private clinics (1973-1995) and updated data from 1,114 public hospital patients.
• Cancer incidence was tracked through the Danish Cancer Registry, comparing implant recipients to women attending clinics for other reasons and the general female population.
• Standardized Incidence Ratios (SIRs) with 95% confidence intervals (CIs) were calculated to assess cancer risk.

Main Results:

• Women receiving implants in private clinics showed an elevated overall SIR of 1.65, primarily due to non-melanoma skin cancer, with no significant excess for other major sites.
• No significant cancer excess was found in women receiving implants in public hospitals (SIR=1.10) or controls (SIR=1.10).
• Breast cancer SIRs were 1.1 in private clinic patients and 0.9 in public hospital patients, neither statistically significant.

Conclusions:

• Overall cancer risk is probably not increased among women receiving cosmetic breast implants.
• Inconsistencies in findings between private and public clinics may stem from selection bias and confounding factors in private clinic patients.
• Further research is needed to understand the determinants of these observed inconsistencies in cancer incidence.