MSLN and neoplasm: Similar trends were observed for SKOV3 and OVCAR4, and the median frequency of live tumor cells (parental and MSLN+, SKOV3, and OVCAR4 cells) retrieved from the spheroids after incubation with treosulfan was between 69–78% and between 60–67% with fludarabine, but was lower (37–58% live tumor cells) when combination of both cytostatics was used.