Table 4. Selectivity index for benzoates-TPP⁺ derivatives at 48 h values were calculated from IC₅₀ ratio between non-tumor cell and tumor cell lines from the respective sigmoidal dose–response curves.

Compounds	Selectivity index (48 h)
	OKF-6 TERT/Cal-27	OKF-6 TERT/HEp-2	OKF-6 TERT/SCC-15
SA-TPP + C 10 (5be)	5.5	3.0	4.0
GA-TPP + C 10 (5bd)	6.0	2.3	4.9
PIA-TPP + C 10 (5bb)	4.7	0.9	2.6
TPP + C 10 (5ba)	3.8	1.0	4.4
Cisplatin (CDDP)	<1.0	<1.0	<1.0