Table 1. The effect of PDD among TS, 5-ALA and O-chlorin in various cell lines.

Photosensitizer
Cell line	TS	5-ALA	O-chlorin	O-chlorin/5-ALA ratio
MKN45	1. 97 ± 0. 20	11. 38 ± 1. 93	80. 26 ± 2. 77	7. 05
HT29	1. 52 ± 0. 10	6. 31 ± 0. 67	79. 17 ± 2. 40	12. 55
OE21	2. 39 ± 0. 11	8. 04 ± 0. 55	76. 78 ± 3. 40	9. 55
KYSE30	2. 92 ± 0. 14	5. 26 ± 0. 41	123. 09 ± 2. 54	23. 40