| PDT | photodynamic therapy |
| ALA | 5-Aminolevulinic acid |
| HMME | hematoporphyrin monomethyl ether |
| PS | photosensitizer |
| CRC | colorectal cancer |
| iv. | intravenous |
| PpIX | protoporphyrin IX |
| PBS | phosphate-buffered saline |
| FBS | fetal bovine serum |
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