[Therapeutic effect of mitomycin C in the immediate postoperatory in patients with low-risk non-muscle-invasive bladder tumours]. / Efecto terapéutico de mitomicina C en el postoperatorio inmediato de pacientes con tumores vesicales no músculo invasores de bajo riesgo.

INTRODUCTION: Bladder cancer is a disease with a high prevalence due to its recurrence rate. Transurethral resection of the bladder (TURB) is the treatment in initial stages. Nevertheless, a high percentage of non-muscle-invasive tumors treated will have a recurrence 1-2 years afterwards. Adjuvant quemotherapy or immunotherapy after TURB has been administered in order to decrease the rate of recurrence and to prevent progression. PATIENTS AND METHODS: A prospectived, controlled and randomized study was performed. We included 100 patients with non-muscle-invasive and bladder tumors the low grade. All patients had initially a TURB performed and were randomized to either receive or not a single dose mitomycin C (MMC) in the immediate postoperatory. RESULTS: All low grade tumors was less than 3 cm. Mean follow-up was 26.43 +/- 7.65 months. MMC was administered in 49 patients, of these, 67.3% had no recurrence and 32.7% had a non-muscle-invasive recurrence. Of the 51 patients in the non mitomycin, 51% had no recurrence while 47% had a non-muscle-invasive recurrence, and 2% had a muscle-invasive progression. We found significantly differences in time to recurrence among the two groups. SUMMARY: We found a greater time to recurrence in the group of single dose adjuvant MMC being this difference statistically significantly when comparing with the other group.

Efecto terapéutico de Mitomicina C en el postoperatorio inmediato de pacientes con tumores vesicales no músculo invasores de bajo riesgo / Therapeutic effect of mitomycin C in the immediate postoperatory in patients with low-risk non-muscle-invasive bladder tumours

Introducción: El cáncer vesical es una de las enfermedades con más alta prevalencia entre los distintos tipos de neoplasia debido a su tendencia a la recidiva. El tratamiento en las etapas iniciales es la resección transuretral (RTU). Sin embargo, después de la RTU de un tumor vesical no músculo invasor, un porcentaje alto recidivarán en 1-2 años. Por esta razón, se ha propuesto la administración de quimioterapia o inmunoterapia adyuvante después de la RTU en un intento de disminuir la recidiva y prevenir la progresión. Pacientes y métodos: Estudio prospectivo, controlado y randomizado. Se incluyeron 100 pacientes con tumores vesicales no músculo-invasores de bajo riesgo. Todos los pacientes sometidos inicialmente a RTU y posteriormente randomizados para recibir Mitomicina C (MMC) postoperatoria en dosis única. Resultados: Todos los tumores eran menores de 3 cm. La media de seguimiento fue de 26,43 ± 7,65 meses. Se administró MMC en 49 pacientes, de los cuales el 67,3% no recidivó y el 32,7% lo hicieron como tumor vesical no invasor. Delos 51 pacientes que no recibieron MMC, el 51% no recidivaron, el 47% recidivaron como tumor no invasor y el 2% como tumor invasor. Se encontraron diferencias significativas en cuanto al tiempo libre de enfermedad según se empleara MMC postoperatoria o nada. Conclusiones: Cuando evaluamos a los pacientes con carcinoma vesical no músculo invasor de bajo riesgo, pertenecientes a un solo centro sanitario y con dosis alta de MMC en dosis única tras la RTU, evidenciamos un mayor tiempo libre de enfermedad estadísticamente significativa frente a los casos en los que no se utilizó ningún tratamiento (AU)

Introductión: Bladder cancer is a disease with a high prevalence due to its recurrence rate. Transurethral resection of the bladder (TURB) is the treatment in initial stages. Nevertheless, a high percentage of non-muscle-invasive tumors treated will have a recurrence 1-2 years afterwards. Adjuvant quemotherapy or immunotherapy after TURB has been administered in order to decrease the rate of recurrence and to prevent progression. Patients and methods: A prospectived, controlled and randomized study was performed. We included 100 patients with non-muscle-invasive and bladder tumors the low grade. All patients had initially a TURB performed and were randomized to either receive or not a single dose mitomycin C (MMC) in the immediate postoperatory. Results: All low grade tumors was less than 3 cm. Mean follow-up was 26,43±7,65 months. MMC was administered in 49 patients, of these, 67,3% had no recurrence and 32,7% had a non-muscle-invasive recurrence. Of the 51 patients in the non mitomycin, 51% had no recurrence while 47% had a non-muscle-invasive recurrence, and 2% had a muscle invasive progression. We found significantly differences in time to recurrence among the two groups. Summary: We found a greater time to recurrence in the group of single dose adjuvant MMC being this difference statistically significantly when comparing with the other group (AU)