[Initial response to therapy as an important prognostic factor in acute lymphoblastic leukemia in childhood. COALL study group].
Prognostic factors to estimate the risk of relapse are crucial for risk-adapted therapy in acute lymphoblastic leukemia (ALL). In a cooperative multicenter treatment study for childhood ALL (COALL-03-85) the prognostic relevance of the bone marrow (BM) blast count at day 28 was evaluated. Treatment was adjusted to the initial risk factors; patients with high risk (white blood count (WBC) greater than or equal to 25/nl, age greater than or equal to 10 years, T- or NULL-ALL) received intensified therapy consisting of rotation of 6 non cross-resistant drug combinations with 12 different agents. After 4 weeks 289/305 (94.8%) children were in complete remission (CR); one child died of infection, and 15 (14 high-risk patients) still had more than 5% blasts in the BM. Twelve of these 15 patients were in remission after 2 to 4 weeks additional treatment. Poor responders often had a high initial WBC, age above 10 years of T- or NULL-ALL. In spite of continuation of intensive therapy all children with more than 10% blasts in the BM on day 28 suffered an early relapse except 2 who were transplanted in first remission. Event-free survival for the poor responders is 0.15 compared to 0.71 (p = 0.0001) for the good responders (median observation time 48 months). In multivariate analysis remission status on day 28 was the only significant prognostic factor in high-risk patients above one year of age; traditional risk factors as initial WBC, age above 10 years, hepatosplenomegaly, and immunological subtype were of no prognostic significance in this study. (ABSTRACT TRUNCATED AT 250 WORDS)
Universitäts-Kinderklinik Hamburg.
G E
GE
Janka-Schaub
H
H
Stührk
B
B
Kortüm
U
U
Graubner
H
H
Jürgens
H J
HJ
Spaar
V
V
Schöck
B
B
Dohrn
R
R
Bahr
K
K
Winkler
D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D001215:Asparaginase / Q000008:administration & dosage; D001853:Bone Marrow / Q000473:pathology; D002648:Child; D002675:Child, Preschool; D003561:Cytarabine / Q000008:administration & dosage; D003630:Daunorubicin / Q000008:administration & dosage; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D007958:Leukocyte Count; D008297:Male; D015122:Mercaptopurine / Q000008:administration & dosage; D008727:Methotrexate / Q000008:administration & dosage; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000188:drug therapy* / Q000401:mortality / Q000473:pathology; D011241:Prednisone / Q000008:administration & dosage; D012074:Remission Induction; D015996:Survival Rate; D014750:Vincristine / Q000008:administration & dosage
D003561:Cytarabine; D014750:Vincristine; D015122:Mercaptopurine; D001215:Asparaginase; D011241:Prednisone; D008727:Methotrexate; D003630:Daunorubicin
Initiales Ansprechen auf die Therapie als wichtigster prognostischer Faktor bei der akuten lymphoblastischen Leukämie im Kindesalter. COALL-Studiengruppe.