SDC1 and ovarian cancer: CD20 and IGKC expression was not prognostic but univariable Cox regression analysis revealed high CD138 expression to correlate with a significantly reduced overall survival (HR = 2.20; 95 % CI 1.34–3.55; p–0.001) as well as ovarian cancer-specific survival (HR = 1.95; 95 % CI 1.28–2.98; p = 0.002).