Clinical outcomes following immediate reconstruction and post-mastectomy radiation therapy

10560 Background: Post-mastectomy radiation therapy (PMRT) is an important component of the treatment for locally advanced breast cancer. Some patients opt for immediate breast reconstruction (IR) to cope with the aesthetic consequences of mastectomy. A small number of series have reported mixed results with IR using a tissue expander/implant (TE/I) followed by PMRT. We sought to determine the outcome of patients receiving PMRT after IR with either TE/I or autologous tissue reconstruction (ATR), with respect to both complications and cosmesis. Methods: We retrospectively reviewed the charts of 47 women who underwent PMRT in our practice after IR. All follow-up information was obtained by reexamination or by telephone interview. Contracture/fibrosis results were scored on a scale as follows: 0- no complaints, 1- mild discomfort, not affecting activities of daily life (ADLs), 2- moderate discomfort, affecting ADLs, or biopsy-proven fat necrosis, 3- complications requiring surgical revision, 4- reconstruction failure, requiring removal. For cosmesis, results were recorded as: 1- acceptable, 2- unacceptable. Results: A total of 47 patients were identified as having undergone PMRT after IR. 35 underwent TE/I and 12 underwent ATR, most commonly transverse rectus abdominus muscle flap reconstruction. Median follow-up was 36 months (range: 26 - 96 months). All patients were treated with 50.4 Gy in 25 fractions to the chest wall, and seven patients received an additional electron boost to high risk areas. All patients received 45 Gy in 25 fractions to a supraclavicular field. Of the patients who underwent TE/I and PRMT, twenty-one of 35 (60%) described unacceptable cosmesis, as opposed to two of 12 ATR patients (17%) (p = .02). Similarly, 13 patients in the TE/I (37%) group required either surgical revision (n = 3) or complete removal of their implant (n = 10), as compared to none of the patients in the ATR group (p = .02). Conclusion: Immediate TE/I reconstruction with PMRT was associated with high rates of complications and poor cosmetic results in our experience. ATR resulted in significantly higher rates of functional and cosmetic success. Thus, if IR is planned in the setting of PMRT, ATR should be recommended. No significant financial relationships to disclose. </jats:p

Interleukin-17A negatively regulates lymphangiogenesis in T helper 17 cell-mediated inflammation

During inflammation lymphatic vessels (LVs) are enlarged and their density is increased to facilitate the migration of activated immune cells and antigens. However, after antigen clearance, the expanded LVs shrink to maintain homeostasis. Here we show that interleukin (IL)-17A, secreted fromT helper type 17 (T(H)17) cells, is a negative regulator of lymphangiogenesis during the resolution phase of T(H)17-mediated immune responses. Moreover, IL-17A suppresses the expression of major lymphatic markers in lymphatic endothelial cells and decreases in vitro LV formation. To investigate the role of IL-17A in vivo, we utilized a cholera toxin-mediated inflammation model and identified inflammation and resolution phases based on the numbers of recruited immune cells. IL-17A, markedly produced by T(H)17 cells even after the peak of inflammation, was found to participate in the negative regulation of LV formation. Moreover, blockade of IL-17A resulted in not only increased density of LVs in tissues but also their enhanced function. Taken together, these findings improve the current understanding of the relationship between LVs and inflammatory cytokines in pathologic conditions.