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Pulsed‐Dye Laser and Retinoic Acid Delay Progression of Oral Squamous Cell Carcinoma: A Murine Model
Author(s) -
Shah Rahul K.,
Valdez Tulio A.,
Wang Zhi,
Shapshay Stanley M.
Publication year - 2001
Publication title -
the laryngoscope
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.181
H-Index - 148
eISSN - 1531-4995
pISSN - 0023-852X
DOI - 10.1097/00005537-200107000-00013
Subject(s) - retinoic acid , medicine , retinoic acid receptor , basal cell , angiogenesis , tretinoin , tumor progression , cancer research , urology , cancer , gastroenterology , chemistry , biochemistry , gene
Objectives/Hypothesis This study examined the role of the pulsed‐dye laser (PDL) at 585 nm coupled with retinoic acid at therapeutic (5.0 mg/kg) and nontherapeutic (0.5 mg/kg) doses to delay the progression of cancer with a two‐hit approach. The existing vasculature is selectively targeted by the laser, whereas retinoic acid inhibits future angiogenesis. Study Design Randomized, prospective study in a murine model. Methods Twenty‐five athymic nude mice were inoculated with oral squamous cell cancers on six flank sites and randomly divided into five groups: 1) control subjects, 2) treatment with 0.5 mg/kg retinoic acid (RA 0.5), 3) treatment with 5.0 mg/kg retinoic acid (RA 5.0), 4) treatment with RA 0.5 + PDL, and 5) treatment with RA 5.0 + PDL. The PDL groups received irradiation after inoculation. The retinoic acid was administered daily. The tumors were counted and measured for 14 days. Results The control group developed visible tumors in 50% of the inoculation sites at 3 days compared with 3 days (RA 0.5) and 4 days (RA 5.0) for the retinoic acid groups and 9 days (RA 0.5 + PDL) and 10 days (RA 5.0 + PDL) for the laser treatment groups. There was no tumor growth until day 7 in the RA 5.0 + PDL group. The tumor volume was statistically different between the treatment groups. Conclusion This study demonstrated the superiority of a single treatment with the PDL coupled with retinoic acid to delay the progression of cancer when compared with treatment with retinoic acid alone, thus introducing a novel strategy in cancer control.