Anticancer effect of combined intratumor cisplatin injection and interstitial KTP laser therapy on xenografted squamous cell carcinoma

This study was conducted to evaluate the synergistic effect of cisplatin and interstitial KTP laser theapy induced hyperthermia in vitro and in vivo (interstitial laser chemotherapy, ILCT). Methods: In vitro study: human hypopharyngeal squamous carcinoma cell line (SNU-1041) was incubated in 1 mL of media containing various concentrations (0, 1, 2, 5, 10, 20, 50, 100 ng/mL) of cisplatin in 37degrees and 43degreesC for 2 hours. The viability of the cell was evaluated by MTT assay. In vivo study: human squamous cell carcinoma tumors were grown as subcutaneous transplants in nude mice and injected into tumor with cisplatin-epigel 100 mug, followed by interstitial laser therapy (ILT) via 0.6-mm diffuser fiber tips (532 nm, 1.0J/mm(3)). Results: In vitro study: the viability of tumor cells incubated with 10 ng/mL of cisplatin was 62% and 28% in 37degreesC and 43degreesC, respectively (p = 0.02). In vivo study: the tumor volume in 4 weeks after treatment was 179 mm(3) in ILT group and 27 mm(3) in ILCT group. The ILCT group showed 8 (80%) complete remission of tumors at 4 weeks follow up, while tumor remission occurred in only 3 (30%) in ILT group (p < 0.05). Conclusion: These results suggest ILCT may become an effective treatment for head and neck carcinoma with minimal functional deficit.