Analgesic effect of high intensity focused ultrasound therapy for unresectable pancreatic cancer.

OBJECTIVE To evaluate the pain-alleviating action, feasibility and efficacy of high intensity focused ultrasound (HIFU) for palliation of inoperable pancreatic cancer in humans. METHODS Forty patients with advanced pancreatic cancer were treated with HIFU. There were 13 patients with stage III, and 27 patients with stage IV disease. The locations of the tumours were as follows: head of pancreas in 9 patients, body and/or tail of pancreas in 31 patients. Pain relief, local tumour control rate, median survival and complications were monitored after HIFU treatment. The primary endpoint was to assess pain relief rate and pain relief time (PRT). Secondary endpoints included local progression-free survival time, overall survival (OS), and side effects. RESULTS There were no severe complications or adverse events related to HIFU therapy in any of the patients treated. Pain relief was achieved in 87.5% of patients, median PRT was 10 weeks. The median local progression-free survival time for all patients was 5 months. The median overall survival time was 10 months for patients with stage III disease, and 6 months for patients with stage IV disease. The median OS time, 6-month and 1-year survival rate for patients as a whole were 8 months, 58.8% and 30.1%, respectively. CONCLUSIONS Although this study may have limitations, preliminary results demonstrate the safety of clinical application of HIFU for pancreatic cancer and reveal it to be a promising mode of treatment for palliation of pain associated with pancreatic cancers.