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Background: Lipofilling is performed in breast cancer patients to optimize the aesthetic outcome following breast reconstruction after mastectomy. Despite its common usage worldwide, little is known about the interaction of the lipoaspirate and dormant cancer cells. Up to date, no risk factors that increase the risk for cancer recurrence have been established. This study aims to identify risk factors for lipofilling candidates after breast cancer and questions the oncological safety of lipofilling in lymph node positive disease., Methods: Matched retrospective cohort study: the disease-free survival (DFS) between 100 breast cancer patients undergoing a lipofilling after their DIEP-flap reconstruction and 100 matched control patients with no subsequent lipofilling was analyzed. Further, patients were subdivided according to risk factors, which were categorized as patient-dependent factors (PDFs) and tumor-dependent factors (TDFs). DFS and hazard ratios (HR) were compared to identify potential risk factors that may increase cancer recurrence., Results: Median follow-up was 76.5 months from the mastectomy, and 31 months from the startpoint to the end of follow-up. Seven and eleven patients had recurrence in the lipofilling and control group, respectively, presenting with comparable DFS rates and an insignificant HR =0.57, 95% confidence interval (CI): 0.22-1.47, P=0.24. According to subgroup survival analysis, lipofilling increased the risk of recurrence in women with a positive nodal status (P=0.035) and a high-grade neoplasia (P=0.049)., Conclusions: No general increased recurrence risk was observed between the lipofilling and control group. The subgroup analysis identified high-grade neoplasia and positive nodal status to be a risk factor for cancer recurrence. Patients with a known node positive disease have an increased risk of occult micrometastases in their lymph nodes. Further studies are necessary to clarify whether dormant breast cancer cells in form of micrometastases in the lymph nodes can be reactivated by the factors secreted by adipose derived stem cells., Competing Interests: Conflicts of Interest: The authors have no conflicts of interest to declare.

Background: The most common cancer worldwide in women is breast cancer. The increasing number of cases each year, requires a novel curative approach that can combine oncological treatments and breast reconstruction yielding a pleasing and aesthetic breast that is a definitive and long lasting solution. Thus, the Immediate-DElayed AutoLogous (IDEAL) breast reconstruction principle was created to hold up to the standards of the needs of contemporary women., Method: The IDEAL protocol for breast reconstruction was developed in our department in cooperation with our breast surgery unit and describes a two-stage approach that implicates neoadjuvant radio-/ chemotherapy treatment regimes and tumor staging before the mastectomy in order to avoid post-mastectomy radiation. In a second step the breast is then reconstructed with autologous tissue for optimal and natural results., Conclusion: More and more patients decide to undergo breast reconstruction after breast cancer. The IDEAL concept offers a life-long and safe solution with a low rate of late complications., (Celsius.)