Table 2.

Anti-tumor activity of methanol extracts of ascidians in three tumor cell lines determined by MTT assay

Sample	Tumor cell lines	IC50 (µM)
P. arabica	HeLa	42.52
	HT29	43
	MCF-7	38.28
P. nigra	HeLa	39.72
	HT29	35
	MCF-7	34.76