Late Breaking Abstract - Prognostic and therapeutic markers of malignant pleural effusion – The PROMISE study by Kessler, B, Collins, G, Gerry, S, Kanellakis, N, Psallidas, I, Thezenas, M, Charles, P, Samsonova, A, Schiller, H, Aschiak, R, Hallifax, R, Mercher, R, Rahman, N