Angelo M Taveira-DaSilva1, Amanda M Jones2, Patricia Julien-Williams2, Mario Stylianou3, Joel Moss2. 1. Cardiovascular and Pulmonary Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD. Electronic address: dasilvaa@nhlbi.nih.gov. 2. Cardiovascular and Pulmonary Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD. 3. Office of Biostatistics Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD.
Abstract
BACKGROUND: Sirolimus reduces serum levels of vascular endothelial growth factor D (VEGF-D); the size of chylous effusions, lymphangioleiomyomas, and angiomyolipomas; and stabilizes lung function in patients with lymphangioleiomyomatosis (LAM). METHODS: To determine whether reductions in VEGF-D levels are sustained over time, as well as parallel changes in lung function and lymphatic disease, we evaluated 25 patients with LAM and measured VEGF-D levels, lung function, and extent of lymphatic disease before and during sirolimus therapy. RESULTS: Treatment with sirolimus stabilized FEV1 and diffusion capacity for carbon monoxide (Dlco) over a period of 4.5 ± 1.6 years, caused resolution of lymphatic disease, and reduced the size of angiomyolipomas and VEGF-D levels (3,720 ± 3,020 pg/mL to 945 ± 591 pg/mL; P < .0001). Yearly changes in FEV1 % predicted and Dlco % predicted were reduced from -7.4% ± 1.4% to -0.3% ± 0.5% (P < .001) and -6.4% ± 0.9% to -0.4% ± 0.5% (P < .001), respectively. Lower VEGF-D levels correlated with sirolimus therapy (P < .001), but no significant relationship was observed between reduction in VEGF-D levels and FEV1 and Dlco during sirolimus therapy. The magnitude of VEGF-D decline was not related to the effect on lung function. Patients with lymphatic disease had higher serum VEGF-D levels, a greater reduction in VEGF-D levels, and better long-term sustained improvement in lung function during sirolimus therapy than did those without lymphatic disease. CONCLUSIONS: Sirolimus therapy stabilizes lung function over many years of therapy while producing a sustained reduction in VEGF-D levels in patients with elevated levels preceding therapy. An association was not demonstrated between the magnitude of VEGF-D decline and the beneficial effect of sirolimus on lung function. Persistent improvement in lung function was observed in patients with lymphatic disease. Published by Elsevier Inc.
BACKGROUND:Sirolimus reduces serum levels of vascular endothelial growth factor D (VEGF-D); the size of chylous effusions, lymphangioleiomyomas, and angiomyolipomas; and stabilizes lung function in patients with lymphangioleiomyomatosis (LAM). METHODS: To determine whether reductions in VEGF-D levels are sustained over time, as well as parallel changes in lung function and lymphatic disease, we evaluated 25 patients with LAM and measured VEGF-D levels, lung function, and extent of lymphatic disease before and during sirolimus therapy. RESULTS: Treatment with sirolimus stabilized FEV1 and diffusion capacity for carbon monoxide (Dlco) over a period of 4.5 ± 1.6 years, caused resolution of lymphatic disease, and reduced the size of angiomyolipomas and VEGF-D levels (3,720 ± 3,020 pg/mL to 945 ± 591 pg/mL; P < .0001). Yearly changes in FEV1 % predicted and Dlco % predicted were reduced from -7.4% ± 1.4% to -0.3% ± 0.5% (P < .001) and -6.4% ± 0.9% to -0.4% ± 0.5% (P < .001), respectively. Lower VEGF-D levels correlated with sirolimus therapy (P < .001), but no significant relationship was observed between reduction in VEGF-D levels and FEV1 and Dlco during sirolimus therapy. The magnitude of VEGF-D decline was not related to the effect on lung function. Patients with lymphatic disease had higher serum VEGF-D levels, a greater reduction in VEGF-D levels, and better long-term sustained improvement in lung function during sirolimus therapy than did those without lymphatic disease. CONCLUSIONS:Sirolimus therapy stabilizes lung function over many years of therapy while producing a sustained reduction in VEGF-D levels in patients with elevated levels preceding therapy. An association was not demonstrated between the magnitude of VEGF-D decline and the beneficial effect of sirolimus on lung function. Persistent improvement in lung function was observed in patients with lymphatic disease. Published by Elsevier Inc.
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