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En oncología solemos escuchar distintos objetivos o desenlaces (endpoints) tanto primarios como secundarios, en los ensayos clínicos que se realizan en el tratamiento para tumores urológicos ya sean citotóxicos (quimioterapia clásica) o inhibidores de los puntos de control inmunitarios (checkpoint inhibitors) o “inmunoterapia”. Estos términos pueden ser intuitivos como la “supervivencia global” o confusos como la supervivencia libre de progresión (progression free survival).
La importancia de comprender estos conceptos radica en que no todos ellos son igual de relevantes para el paciente al momento de decidir sobre su tratamiento, ni para el médico al momento de decantarse por un tratamiento u otro.
La evidencia es basta y confusa, y la clara influencia de la industria farmacéutica en la redacción de las publicaciones científicas obliga al médico (y pacientes) a instruirse en la interpretación de la información aportada en los resultados para poder sacar sus propias conclusiones.
Es por ello que un tratamiento que haya demostrado una mejoría en la supervivencia global 12 meses siempre deberá ser elegido antes que un tratamiento que ha demostrado una supervivencia libre de progresión de 13 meses y que no reporte supervivencia global. La supervivencia libre de progresión es un desenlace sustituto que no necesariamente implica que se prolongue la vida ni la calidad de esta, que son las dos principales cosas que le importan al paciente que padece cáncer (living longer and living better)
En la siguiente tabla explicamos lo términos más frecuentes con su interpretación simplificada, ventajas y desventajas.Desenlace (endpoint)DefiniciónInterpretaciónSupervivencia global
(Overall survival / OS)Tiempo desde la aleatorización (inclusión en el estudio) hasta el fallecimiento por cualquier causa.Históricamente es el desenlace más importante en oncología (gold standard), con vistas a prolongar la vida, siempre y cuando se consiga mantener una buena calidad de vida.
Incluye muertes no asociadas al cáncer o al tratamiento.
Se puede alterar si los pacientes reciben líneas de tratamiento posterior o se realiza “crossover” en el estudio.Tiempo hasta progresión del tumor
(Time to tumor progression / TTP)Tiempo desde la aleatorización hasta la progresión objetiva del tumor. Esta definición no incluye los fallecimientos.
Sigue criterios radiológicos.
Es de poco interés para los pacientes.Supervivencia libre de progresión
(Progression free survival / PFS)Tiempo desde la aleatorización hasta la progresión objetiva del tumor o el fallecimiento.Contrario al TTP, esta definición incluye el fallecimiento.
Es un desenlace que se correlaciona con la supervivencia global (aunque no necesariamente es así)Tasa de respuesta objetiva
(Objective response rate / ORR)Proporción de pacientes con una reducción en el tamaño del tumor durante un periodo de tiempo, ambos pre-definidos.
Se suele sumar la respuesta completa y la respuesta parcial (actividad anti-tumoral).Esta medida busca medir la actividad del fármaco ante el tumor per se, sin embargo, no es un desenlace de interés directo para el paciente.
Se utilizan herramientas radiológicas como los criterios RECIST.
La enfermedad estable (no progresión pero no regresión) no entra dentro de esta definición.Tiempo hasta fracaso del tratamiento
(time to treatment failure / TTF)Desenlace compuesto, se define como el tiempo desde la aleatorización hasta la discontinuación del tratamiento por cualquier motivo (toxicidad, fallecimiento, progresión).No se considera un desenlace valido para medir efectividad ya que se ve contaminado por otros motivos, incluyendo la preferencia del paciente (deseo de suspender el tratamiento por cualquier motivo).Desenlaces reportados por pacientes
(Patient reported outcomes / PRO)Estos son desenlaces referidos por los pacientes, asociados a la calidad de vida.Son de interés directo para el paciente.
No existen elementos validados para medirlos.Tiempo hasta el siguiente tratamiento
(Time to next treatment / TTNT)Tiempo desde el final del tratamiento primario hasta el inicio del siguiente tratamiento.Puede ser de utilidad en enfermedades incurables.
No es utilizado con frecuencia.Duración de la respuesta
(Duration of response / DoR)Tiempo desde que se documenta respuesta del tumor hasta la progresión del mismo.No es de interés directo para el paciente.
Valora la respuesta del fármaco sobre el tumor y puede evaluarse en ensayos de un solo brazo (sin grupo control).Supervivencia libre de enfermedad
(Disease free survival / DFS)Tiempo desde la aleatorización hasta la recurrencia del tumor o fallecimiento por cualquier causa. Habitualmente utilizado en adyuvancia (tratamiento tras cirugía radical o radioterapia con intención curativa) .
Útil en escenarios en los que la supervivencia es larga o en los que la mayoría de los pacientes alcanzan la respuesta completa.
Finalemente, incluimos una tabla que explica las ventajas y desventajas de la supervivencia global vs la supervivencia libre de progresión como desenlaces en los ensayos oncológicos.DesenlaceVentajasDesventajasSupervivencia global (OS)
– Medido con precisión.
– Clínicamente significativo cuando se acompaña de una preservación de la calidad de vida.
– Puede verse afectado por crossover y terapias posteriores.
– Puede implicar estudios más grandes y un seguimiento más largo.
– Incluye muertes no cancerígenas.
– Sujeto a censura de derechos.Supervivencia libre de progresión (PFS)
– Incluye la medición de enfermedad estable.
– Requiere un tamaño de muestra más pequeño.
– Requiere un seguimiento más corto.
– Generalmente basado en objetivo y
evaluaciones cuantitativas.
– No se ve afectado por el crossover o terapias posteriores.
– Las definiciones varían entre los estudios.
– Requiere evaluaciones radiológicas u otras evaluaciones frecuentes.
– Implica un calendario equilibrado de evaluaciones entre los brazos de tratamiento.
– No se mide con precisión; sujeto a sesgo de evaluación particularmente en
estudios de etiqueta abierta (open label).
– Sujeto a censura por intervalos.
– No está validado estadísticamente como un sustituto para la supervivencia en todos los entornos.
Referencias:
U.S. Department of Health and Human Services Food and Drug Administration Center for Drug Evaluation and Research (CDER), Center for Biologics Evaluation and Research (CBER). Guidance for industry: clinical trial endpoints for the approval of cancer drugs and biologics. http://www.fda.gov/downloads/Drugs/…/Guidances/ucm071590.pdf. Published May 2007. Consultado 10/12/2018.
Villaruz LC, Socinski MA. The clinical viewpoint: definitions, limitations of RECIST, practical considerations of measurement. Clin Cancer Res. 2013 May 15;19(10):2629-36. doi: 10.1158/1078-0432.CCR-12-2935.
Pazdur R. Endpoints for assessing drug activity in clinical trials. Oncologist. 2008;13 Suppl 2:19-21. doi: 10.1634/theoncologist.13-S2-19.
https://www.biooncology.com/clinical-trials/efficacy-endpoints.html . Consultado 10/12/2018
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DIFFERENCES BETEWEEN VENOUS AND ARTERIAL VENOUS
To give continuity to the previous topic, we thought it prudent to place the differences between venous and arterial ulcers, since the treatment is completely different, along with the history collected in the clinical history, physical examination, and other complementary examinations, but on some occasions it is not easy to establish the origin, since a high percentage of venous ulcers have an arterial component. Next we leave you a table where the main differences between them are exposed.
Differences between venous and arterial ulcer To give continuity to the previous topic, we thought it prudent to place the differences between venous and arterial ulcers, since the treatment is completely different, along with the history collected in the clinical history, physical examination, and other complementary examinations, but on some occasions it is not easy to establish the origin, since a high percentage of venous ulcers have an arterial component. Next we leave you a table where the main differences between them are exposed. image
. DEFINITION OF VASCULAR ULCER It is a lesion with the deterioration of the solution of continuity with loss of substance, epithelium and/or conjunctiva produced by a pathological process of vascular origin, have a chronic evolution and little or no tendency to spontaneous healing. They are painful lesions that hinder mobility and alter one's own body image. The pain is frequent and can be severe or continuous and disabling. They have a chronic and relapsing character with a high rate of recurrence.
ETIOLOGY The ulcer originates from a deterioration of the cutaneous microcirculation. According to its etiology, it is classified as:
•: arteriosclerosis obliterans 90%, vasculitis, thromboangiitis obliterans, Raynand's disease, discreet smoking, dyslipidemia, arterial hypertension
. VENOUS ULCERS: skin and vascular alterations according to the degree of venous insufficiency. Grade I It is the initial phase. There are superficial varicose veins that affect the plantar arch, malleolar areas, and ankles. He The patient reports a feeling of heaviness and pain at the end of the day
. Grade II It may appear:
Edema purpuri
hyperpigmentation
Increase in thickness, being able to reach elephantiasis in the extremity Area of whitish skin located in the peri-malleolar area Eczema of ecstasy, which causes intense itching. It is frequent that small erosions by scratching can turn into ulcers.
Thrombophlebitis Bleeding that can be important due to rupture of very dilated veins Grade III In addition to the above symptoms, open ulcers appear, with a sudden onset (trauma direct, rupture of a varicose vein, infectious agents on the skin...) or insidious (persistent scab, profuse desquamation, slight abrasions…) ulcerative scar
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