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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 2002 Feb;93(2):216–222. doi: 10.1111/j.1349-7006.2002.tb01261.x

Enhanced Antitumor Effect of Ultrasound in the Presence of Piroxicam in a Mouse Air Pouch Model

Kyoji Okada 1,✉, Eiji Itoi 1, Naohisa Miyakoshi 1, Mizuho Nakajima 1, Toshio Suzuki 2, Jun Nishida 3
PMCID: PMC5926946  PMID: 11856486

Abstract

The antitumor effects of piroxicam, a non‐steroidal anti‐inflammatory drug, on sarcoma 180 cells under ultrasonic irradiation were examined in a mouse air pouch model. When piroxicam was added to sarcoma 180 suspension under ultrasound irradiation (2 MHz, 10 W, 120 s), the mortality rate of tumor cells immediately after the irradiation and the survival rate of mice were significantly higher than those when ultrasound alone was applied, and these effects of piroxicam were dose‐dependent. When D‐mannitol was used with piroxicam, the mortality rate of the tumors cells after the irradiation was comparable with that when piroxicam alone was applied, but when L‐ histidine was used concurrently, the antitumor effect was significantly lower than that when piroxicam alone was applied. Histological examinations one week after the ultrasound irradiation in the presence of piroxicam showed sparse tumor tissue in the air pouch and normal appearance of the air pouch and surrounding tissue. The findings suggest that piroxicam enhances the anti‐ tumor effects of ultrasound in vivo by increasing the production of singlet oxygen without damage to tissue surrounding the tumor.

Keywords: Antitumor effect, Ultrasound, Nonsteroidal anti‐inflammatory drugs, Sonodynamic compound, Piroxicam

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