A validation study of the WHO analgesic ladder: a two-step vs three-step strategy.

ABSTRACT

GOALS OF WORK The aims of the present study were to verify whether an innovative therapeutic strategy for the treatment of mild-moderate chronic cancer pain, passing directly from step I to step III of the WHO analgesic ladder, is more effective than the traditional three-step strategy and to evaluate the tolerability and therapeutic index in both strategies. METHODS: Patients aged 18 years or older with multiple viscera or bone metastases or with locally advanced disease were randomized. Pain intensity was assessed using a 0-10 numerical rating scale based on four questions selected from the validated Italian version of the Brief Pain Inventory. Treatment-specific variables and other symptoms were recorded at baseline up to a maximum follow-up of 90 days per patient. RESULTS: Fifty-four patients were randomized onto the study, and pain intensity was assessed over a period of 2,649 days. The innovative treatment presented a statistically significant advantage over the traditional strategy in terms of the percentage of days with worst pain > or =5 (22.8 vs 28.6%, p < 0.001) and > or =7 (8.6 vs 11.2%, p = 0.023). Grades 3 and 4 anorexia and constipation were more frequently reported in the innovative strategy arm, although prophylactic laxative therapy was used less in this setting. CONCLUSIONS: Our preliminary data would seem to suggest that a direct move to the third step of the WHO analgesic ladder is feasible and could reduce some pain scores but also requires careful management of side effects.