Immediate release fentanyl. Real world data on abuse and dependence in Spain / Fentanilo de liberación inmediata. Datos de vida real de abuso y dependencia en España

Purpose: A substantial increase in the prescription of immediate release fentanyl (IRF) outside hospitals was observed in previous studies between 2012 and 2017, however it remains unknown the extent of immediate release fentanyl use disorders (IRFUD). This study aimed to estimate the incidence and risk factors of IRFUD, such us abuse and dependence, in Spain during this period. Methods: Retrospective cohort study performed in a Spanish electronic primary care healthcare records database (BIFAP). The incidence rate of IRFUD was calculated by dividing the number of incident cases by the total patient-years (p-y) of exposure. Demographic data, lifestyle, cancer diagnosis, comorbidities and concomitant medication were described and analyzed overall and in patients developing IRFUD using Cox regression models. Effect of the type of treatment (continuous/discontinuous) and duration were also evaluated. Results: The incidence of IRFUD in the 12,267 patients analyzed was 1.8 cases per 100 p-y of exposure. Baseline analysis showed higher frequencies of IRFUD for smokers, patients with a history of substance abuse, non-oncology indication and diagnosis of depression and anxiety, respect to non-IRFUD patients. Patients aged ≥ 80 were less likely to develop IRFUD abuse/dependence. Significant differences were for concomitant use of other treatments with potential for dependence and abuse, such as benzodiazepines. The risk of IRFUD increased with treatment duration, being the highest for treatments lasting 180 days and longer. Conclusion: Incidence of IRFUD is difficult to contrast due to the lack of similar studies. It could be considered not too higher outside hospitals but possible in cancer and non-cancer patients... (AU)

En estudios previos se ha observado un aumento considerable en la prescripción de fentanilo de liberación inmediata en el ámbito extrahospitalario entre 2012 y 2017. Sin embargo, aún se desconoce la magnitud de dependencia y abuso derivada de su uso. Este estudio tiene como objetivo estimar la incidencia y los factores de riesgo de los trastornos derivados del uso de fentanilo de liberación inmediata en España, tales como el abuso y la dependencia durante este período. Métodos: Estudio de cohortes retrospectivo realizado en España en la base de datos de historias clínicas electrónicas de atención primaria (BIFAP). La tasa incidencia de trastornos por el uso de fentanilo, se calculó dividiendo el número de casos incidentes entre el total de personas-año de exposición. Se analizaron datos demográficos, estilo de vida, diagnóstico de cáncer, comorbilidades y medicación concomitante. Para el análisis se utilizaron modelos de regresión de Cox. También se evaluó el efecto del tipo de tratamiento (continuo/discontinuo) y la duración de tratamiento. Resultados:La incidencia de trastornos por el uso de fentanilo en los 12,267 pacientes analizados fue de 1.8 casos por 100 personas-año de exposición. Se observó una frecuencia más elevada en aquellos pacientes que al inicio del tratamiento eran fumadores, pacientes con antecedentes de abuso de sustancias, con indicaciones no oncológicas y en pacientes con diagnóstico de depresión y ansiedad en comparación con los pacientes que no desarrollaron el evento. Los pacientes mayores de 80 años presentaron menos probabilidades de desarrollar estos trastornos. Se observaron diferencias significativas en el uso concomitante con otros tratamientos con potencial de desarrollar dependencia y abuso, como las benzodiacepinas. El riesgo aumentó con la duración del tratamiento, siendo más elevado para aquellos tratamientos que duraban 180 días o más... (AU)

Reduced risk of colorectal cancer among long-term users of aspirin and nonaspirin nonsteroidal antiinflammatory drugs.

Use of nonsteroidal antiinflammatory drugs (NSAIDs) has been associated with a reduced risk of colorectal cancer, but limited information is available on the effect of individual nonaspirin NSAIDs. In addition, the dose-response relation of aspirin in reducing the risk of colorectal cancer has not been described. We carried out a population-based cohort study with secondary case-control analysis to determine the association between the risk of colorectal cancer and use of aspirin and individual NSAIDs, including the role of dose and duration. The General Practice Research Database in the U.K. was the source population. We traced 943,903 persons 40-79 years of age and free of cancer and colorectal adenoma between January 1994 and September 1997. A total of 2,002 incident cases of colorectal cancer were ascertained. The incidence rate of colorectal cancer per 10,000 person-years was 7.3. The risk of colorectal cancer was reduced in users of nonaspirin NSAIDs and became evident after 6 months of continuous treatment. The adjusted relative risk was 0.5 (95% confidence interval = 0.4-0.7). The reduction in risk disappeared completely 1 year after stopping NSAID treatment. The risk of developing colorectal cancer was reduced in long-term users of aspirin at doses of 300 mg daily (relative risk = 0.6; 95% confidence interval = 0.4-0.9). Daily doses of 75 and 150 mg aspirin were not associated with a reduced risk of colorectal cancer. Our data support the existence of an important protective effect of nonaspirin NSAID continuous intake against colorectal cancer and point to a similar reduction in risk for aspirin at doses of at least 300 mg daily. One-year treatment with NSAIDs would prevent one case of colorectal cancer in a population of 1,000 persons 70-79 years of age.

Reduced incidence of colorectal adenoma among long-term users of nonsteroidal antiinflammatory drugs: a pooled analysis of published studies and a new population-based study.

Chronic treatment with nonsteroidal antiinflammatory drugs (NSAIDs) has been associated with a reduced risk of colorectal cancer, but less information is available on the relationship between NSAIDs and colorectal adenoma. We carried out a population-based cohort study with nested case-control analysis to determine the association between the use of aspirin and individual NSAIDs and the risk of colorectal adenoma. The General Practice Research Database in the United Kingdom was the source population. We followed 943,903 persons who were 40-79 years of age and free of colorectal adenoma or other cancer at baseline, which varied between January 1994 and September 1997. There were 1,864 incident cases of colorectal adenoma, for an incidence rate of 6.8 per 10,000 person-years. Compared with non-users, long-term users (1 year and more) of nonaspirin NSAIDs had a 40% decreased risk of colorectal adenoma (relative risk = 0.6; 95% confidence interval = 0.4-0.9). Long-term NSAID use was still associated with a reduced risk 1 year after stopping NSAID treatment. Use of most individual NSAIDs conferred a reduced risk. The risk of developing colorectal adenoma was reduced in long-term users of aspirin at doses of 300 mg daily (relative risk = 0.6; 95% confidence interval = 0.4-1.0), but reduced risk was not evident with daily doses of 75 and 150 mg aspirin. These results add further support to the value of NSAIDs as a candidate for primary prevention of colorectal tumors.