• Hirotoshi Ishiwatari, Tsuyoshi Hayashi, Makoto Yoshida, Michihiro Ono, Hiroyuki Masuko, Tsutomu Sato, Koji Miyanishi, Yasushi Sato, Rishu Takimoto, Masayoshi Kobune, Atsushi Miyamoto, Tomoko Sonoda, and Junji Kato.
• Hirotoshi Ishiwatari, Tsuyoshi Hayashi, Makoto Yoshida, Michihiro Ono, Tsutomu Sato, Koji Miyanishi, Yasushi Sato, Rishu Takimoto, Masayoshi Kobune, Junji Kato, Department of Medical Oncology and Hematology, Sapporo Medical University School of Medicine, Sapporo 0600061, Japan.
• World J. Gastroenterol. 2014 Aug 14;20(30):10512-7.

AimTo investigate the effectiveness of phenol for the relief of cancer pain by endoscopic ultrasound-guided celiac plexus neurolysis (EUS-CPN).MethodsTwenty-two patients referred to our hospital with cancer pain from August 2009 to July 2011 for EUS-CPN were enrolled in this study. Phenol was used for 6 patients with alcohol intolerance and ethanol was used for 16 patients without alcohol intolerance. The primary endpoint was the positive response rate (pain score decreased to ≤ 3) on postoperative day 7. Secondary endpoints included the time to onset of pain relief, duration of pain relief, and complication rates.ResultsThere was no significant difference in the positive response rate on day 7. The rates were 83% and 69% in the phenol and ethanol groups, respectively. Regarding the time to onset of pain relief, in the phenol group, the median pre-treatment pain score was 5, whereas the post-treatment scores decreased to 1.5, 1.5, and 1.5 at 2, 8, and 24 h, respectively (P < 0.05). In the ethanol group, the median pre-treatment pain score was 5.5, whereas the post-treatment scores significantly decreased to 2.5, 2.5, and 2.5 at 2, 8, and 24 h, respectively (P < 0.01). There was no significant difference in the duration of pain relief between the phenol and ethanol groups. No significant difference was found in the rate of complications between the 2 groups; however, burning pain and inebriation occurred only in the ethanol group.ConclusionPhenol had similar pain-relieving effects to ethanol in EUS-CPN. Comparing the incidences of inebriation and burning pain, phenol may be superior to ethanol in EUS-CPN procedures.

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