There are quite a few articles out there...have you tried pulling any of these?
Bolen JC, Andersen RE, Bennett RG. Deep vein thrombosis as a complication of megestrol acetate therapy among nursing home residents. J Am Med Dir Assoc. 2000 Nov-Dec;1(6):248-52.
Koller E, Gilbert C, Green L, Mann M, Bernstein B. Thrombotic events associated with megestrol acetate in patients with AIDS cachexia. Nutrition. 1999;15:294-298.
Force LI, Barrufet P, Herreras Z, Bolibar I. Deep venous thrombosis and megestrol in patients with HIV infection. AIDS. 1999;13:1425-1426.
Marshall LL. Megestrol acetate therapy in geriatric patients: case reviews and associated deep vein thrombosis. Consult Pharm. 2003 Sep;18(9):764-73.
Kropsky, B., Y. Shi, et al. Incidence of deep-venous thrombosis in nursing home residents using megestrol acetate. J Am Med Dir Assoc 2003 4(5):255-6.
Thomas, et al. Incidence of venous thromboembolism in megestrol acetate users. J Am Med Dir Assoc. 2004 Jan-Feb;5(1):65-6; author reply 66-7.
S. Hussain, M. Singh, R. Shi, R. Mansour, G. Mills, J. Marion. Journal of Clinical Oncology, 2006 ASCO Annual Meeting Proceedings Part I. Vol 24, No. 18S (June 20 Supplement), 2006: 18510