Abstract
Background: The improved survival rates for childhood acute lymphoblastic leukemia (ALL) may be jeopardized by the development of a second cancer, which has been associated with thiopurine therapy. Procedure: We retrospectively analyzed three sequential Nordic Society of Paediatric Haematology and Oncology's protocols characterized by increasing intensity of thiopurine-based maintenance therapy. We explored the risk of second cancer in relation to protocols, risk group, thiopurine methyltransferase (TPMT) activity, ALL high hyperdiploidy (HeH), and t(12;21)[ETV6/RUNX1]. Results: After median 9.5 years (interquartile range, 5.4–15.3 yrs) of follow-up, 40 of 3,591 patients had developed a second cancer, of whom 38 had non-high-risk B-cell precursor ALL. Patients with standard-risk ALL, who received the longest maintenance therapy, had the highest adjusted hazard of second cancer (hazard ratio [HR], intermediate vs. standard risk: 0.16, 95% CI: 0.06−0.43, P < 0.001; HR, high vs. standard risk: 0.09, 95% CI: 0.02−0.49, P = 0.006); no significant effects of protocol, age, or white blood cell count at diagnosis, ALL HeH, or t(12;21)[ETV6/RUNX1] were observed. A subset analysis on the patients with standard-risk ALL did not show an increased hazard of second cancer from either HeH or t(12;21) (adjusted HR 2.02, 95% CI: 0.69−5.96, P = 0.20). The effect of low TPMT low activity was explored in patients reaching maintenance therapy in clinical remission (n = 3,368); no association with second cancer was observed (adjusted HR 1.43, 95% CI: 0.54−3.76, P = 0.47). Conclusions: The rate of second cancer was generally highest in patients with low-risk ALL, but we could not identify a subset at higher risk than others.
Original language | English |
---|---|
Article number | e26518 |
Journal | Pediatric Blood & Cancer |
Volume | 64 |
Issue number | 10 |
Pages (from-to) | 1-9 |
Number of pages | 9 |
ISSN | 1545-5009 |
DOIs | |
Publication status | Published - Oct 2017 |
Keywords
- Adolescent
- Antineoplastic Combined Chemotherapy Protocols
- Child
- Chromosomes, Human, Pair 12
- Chromosomes, Human, Pair 21
- Female
- Follow-Up Studies
- Humans
- Male
- Methyltransferases
- Neoplasms, Second Primary
- Ploidies
- Precursor Cell Lymphoblastic Leukemia-Lymphoma
- Retrospective Studies
- Risk Factors
- Translocation, Genetic
- Journal Article