Table 2. IC₅₀ values (μM) for the free PS 1 and PS 2 and MAb conjugates to the SKOv3-CEA-1B9 cell line.

	IC50 value
PS 1	68.0±18.0
PS 1–35A7	No IC50
PS 1–FSP 77	4.2±0.9
PS 2	24.0±2.1
PS 2–35A7	10.0±3.0
PS 2–FSP 77	1.7±1.1

MAb=monoclonal antibodies; PS=photosensitisers. Values expressed as the mean±s.d. of three experiments.