Large retroperitoneal lymph nodes (RPLN) as a predictor for venous thromboembolism (VTE) in patients (pts) with germ cell tumor (GCT) receiving first-line chemotherapy (chemo).

332 Background: VTE causes significant morbidity and mortality in GCT pts. While an existing and validated predictive model identifies VTE risk in chemo pts with any cancer (Khorana model), a predictive model specific to GCT does not exist. Many GCT pts present with bulky RPLN that produce venous stasis in the lower extremities. The objective of this study was to explore the association between large RPLN and VTE in GCT pts receiving chemo and compare large RPLN as a predictor for VTE in GCT pts to the non-GCT specific Khorana model. Methods: Clinical data from our institutional GCT database was complemented by review of radiology, pharmacy and medical records. All GCT pts receiving 1st line chemo between 1-Jan-00 and 31-Dec-10 were included. Large RPLN were defined as ≥5cm in maximal diameter. Factors used in the Khorana model (baseline BMI, hemoglobin, white cell count and platelets) were collected. We compared the predictive accuracy of large RPLN versus Khorana score ≥3 using receiver operator charact...