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Cell viability assay for biliary cancer cells. Cell viability was evaluated after staining with crystal violet. (a) HuCCT-1 showed marked growth inhibition at 1 µM VP (-65.8%, P < 0.01) under NBI light (5 J/cm2). (b) KKU-213 similarly exhibited significant growth inhibition at 0.4 µM (-67.8%, P < 0.05) under NBI light (5 J/cm2). *P < 0.05. **P < 0.01. NBI: narrow-band imaging; VP: verteporfin.
