FN1 and neoplasm: Moreover, the cytotoxic activity of CTLs was augmented by FN stimulation against autologous tumour cells [4 h 51Cr release assay: FN(+) 16.7 +/- 4.7% vs FN (-) 11.8 +/- 3.1%; 16 h 51Cr release assay: FN(+) 24.8 +/- 4.7% vs FN (-) 16.5 +/- 5.7%, P<0.05].