Figure 2

Control of distant tumours by PDT is dependent upon the presence of adaptive immune cells. S.c. tumours present on BALB/cJ or SCID mice bearing s.c. and lung tumours were treated with PDT (BALB/cJ, n=16; SCID, n=18). The average number of lung tumours was determined as described in Materials and Methods; error bars represent s.e.m. Significance was calculated by Student's t-test.