Anticancer effect of combined intratumor cisplatin injection and interstitial KTP laser therapy on xenografted squamous cell carcinoma.
OBJECTIVE
This study was conducted to evaluate the synergistic effect of cisplatin and interstitial KTP laser therapy 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 37 degrees and 43 degrees C 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 microg, 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 37 degrees C and 43 degrees C, 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).


CONCLUSIONS
These results suggest ILCT may become an effective treatment for head and neck carcinoma with minimal functional deficit.
Chung
Phil-Sang
PS
Department of Otolaryngology-Head and Neck Surgery, Medical Laser Research Center, Dankook University, College of Medicine, 29 Anseo-Dong, Cheonan, Choongnam-Do, Korea 330-714. pschung@dankook.ac.kr
Kim
Han-Gyun
HG
Rhee
Chung-Ku
CK
Saxton
Romaine E
RE
D000818:Animals; D000970:Antineoplastic Agents / Q000008:administration & dosage*; D001918:Brachytherapy; D002294:Carcinoma, Squamous Cell / Q000188:drug therapy* / Q000532:radiotherapy*; D002945:Cisplatin / Q000008:administration & dosage*; D003131:Combined Modality Therapy; D006801:Humans; D006979:Hyperthermia, Induced; D007012:Hypopharyngeal Neoplasms; D015552:Injections, Intralesional; D028022:Low-Level Light Therapy / Q000295:instrumentation / Q000379:methods*; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D014407:Tumor Cells, Cultured / Q000187:drug effects / Q000528:radiation effects
D000970:Antineoplastic Agents; D002945:Cisplatin