[Prevalence and prognostic significance of myeloid markers in adults with high-risk acute lymphoblastic leukemia]. / Prevalencia y significado pronóstico de los marcadores mieloides en adultos con leucemia aguda linfoblástica de alto riesgo.

BACKGROUND AND OBJECTIVE: The prognostic value of myeloid antigen expression in adult acute lymphoblastic leukemia (ALL) is controversial. The objective of this study was to evaluate the frequency and prognostic significance of myeloid antigen expression in adults with high risk ALL. PATIENTS AND METHOD: Between June 1993 and July 2002, 222 adults patients with high-risk ALL were treated according to the PETHEMA LAL 93 protocol. The frequency of myeloid antigen expression, its association with other clinical and biologic variables and the prognostic significance in terms of complete remission (CR) rate, event free survival (EFS) and overall survival (OS) were analyzed. RESULTS: Myeloid antigen expression was present in 96 out of 222 patients (43%). No association was observed between myeloid antigen expression and the main clinical and biologic characteristics of ALL. Response to treatment was slower in patients expressing myeloid antigens, but no differences were found in CR achievement, EFS or OS. The probability of EFS at 10 years for ALL patients without and with myeloid antigen expression was 35% and 34%, respectively, while the probability of OS at 10 years was 30% and 33%, respectively. This absence of differences in EFS and OS probabilities was also observed when only slow responding patients were analyzed. CONCLUSIONS: In this study, myeloid antigen expression did not have prognostic influence in adult patients with high risk ALL.

Prevalencia y significado pronóstico de los marcadores mieloides en adultos con leucemia aguda linfoblástica de alto riesgo / Prevalence and prognostic significance of myeloid markers in adults with high-risk acute lymphoblastic leukemia

Fundamento y objetivo: El valor pronóstico de los marcadores mieloides en la leucemia aguda linfoblástica (LAL) del adulto es controvertido. El objetivo de este estudio fue evaluar la frecuencia y el significado pronóstico de los marcadores mieloides en adultos con LAL de alto riesgo. Pacientes y método: Entre junio de 1993 y julio de 2002, 222 pacientes adultos con LAL de alto riesgo se trataron según el protocolo PETHEMA LAL 93. Se analizó la frecuencia de los marcadores mieloides, su asociación con otras variables clínico-biológicas de la LAL y el significado pronóstico expresado como la probabilidad de obtención de la remisión completa (RC), supervivencia libre de evento (SLE) y supervivencia global (SG). Resultados: La presencia de marcadores mieloides se constató en 96 de los 222 pacientes (43%). No se observó ninguna relación entre la presencia de marcadores mieloides y las principales características clínico-biológicas de la LAL. La rapidez de la respuesta al tratamiento fue menor en los pacientes con marcadores mieloides, pero no se hallaron diferencias en la tasa de obtención de la RC, la SLE y la SG. La probabilidad de SLE a los 10 años fue, respectivamente, del 35 y del 34% para las LAL con marcadores mieloides y sin ellos. La probabilidad de SG a los 10 años fue del 33% para las LAL con marcadores mieloides y del 30% para las que no los presentaban. Cuando se estudiaron de manera aislada los pacientes con respuesta lenta al tratamiento, tampoco se hallaron diferencias en términos de SLE y SG entre ambos tipos de LAL. Conclusiones: En este estudio los marcadores mieloides no tuvieron significado pronóstico en los pacientes adultos con LAL de alto riesgo

Background and objective: The prognostic value of myeloid antigen expression in adult acute lymphoblastic leukemia (ALL) is controversial. The objective of this study was to evaluate the frequency and prognostic significance of myeloid antigen expression in adults with high risk ALL. Patients and method: Between June 1993 and July 2002, 222 adults patients with high-risk ALL were treated according to the PETHEMA LAL 93 protocol. The frequency of myeloid antigen expression, its association with other clinical and biologic variables and the prognostic significance in terms of complete remission (CR) rate, event free survival (EFS) and overall survival (OS) were analyzed. Results: Myeloid antigen expression was present in 96 out of 222 patients (43%). No association was observed between myeloid antigen expression and the main clinical and biologic characteristics of ALL. Response to treatment was slower in patients expressing myeloid antigens, but no differences were found in CR achievement, EFS or OS. The probability of EFS at 10 years for ALL patients without and with myeloid antigen expression was 35% and 34%, respectively, while the probability of OS at 10 years was 30% and 33%, respectively. This absence of differences in EFS and OS probabilities was also observed when only slow responding patients were analyzed. Conclusions: In this study, myeloid antigen expression did not have prognostic influence in adult patients with high risk ALL