Total XV - Total Therapy Study XV for Newly Diagnosed Patients With Acute Lymphoblastic Leukemia
These are the following secondary objectives:
- To determine if CNS irradiation can be safely omitted in the context of the systemic
therapy used in the protocol.
- To identify whether prolonged (24 hour) intravenous infusions of HDMTX produce greater
methotrexate polyglutamate (MTXPG) accumulation than short (4 hour) infusions 42 hours
after 1 gm/m2 of HDMTX, stratified for lineage (T- vs B-lineage) and ploidy
(hyperdiploid vs non-hyperdiploid B-lineage).
- To determine whether prolonged (24 hour) intravenous infusions of HDMTX produce greater
antileukemic effects than short (4 hour) infusions, based on the inhibition of de novo
purine synthesis in bone marrow blasts and the decrease in circulating blasts during
the 4 day "window" prior to initiation of conventional remission induction therapy.
- Other exploratory objectives
Details of Treatment Plan
Treatment will consist of three main phases, Remission Induction, Consolidation, and
Continuation. Treatment with an Upfront HDMTX Window for research purposes will be optional.
All patients will receive IT therapy on day 1, dose is age dependent.
Upfront High-Dose Methotrexate Window
HDMTX (1 g/m2) as a 4 hour infusion versus as a 24 hour infusion. Leucovorin rescue will be
Prednisone 40 mg/m2/day PO Days 5 - 32 Vincristine 1.5 mg/m2/week IV Days 5, 12, 19, 26
Daunorubicin 25 mg/m2/week IV Days 5, 12 L-asparaginase 10,000 Unit/m2/dose IM Days 6, 8,
10, 12, 14, 16 (19, 21, 23) Cyclophosphamide 1000 mg/m2/dose IV Day 26 Cytarabine 75
mg/m2/dose IV Days 27-30, 34-37 6-Mercaptopurine 60 mg/m2/dose PO Days 26-39 Imatinib 40
mg/m2 bid for Ph positive patients starting Day 22 of induction. Intrathecal therapy will be
administered on day 1 and 19, dose age dependent. Patients with high risk of CNS relapse
will receive additional IT treatments on days 8 and 26.
High dose methotrexate targeted dose depending on risk status, days 1, 15, 29, and 43 and
mercaptopurine 50 mg/m2/day, days 1-56.
Reintensification treatment for patients with high risk disease:
Patients with high risk disease will be offered the option of hematopoietic stem cell
transplant (HSCT) and may receive an additional 1-2 cycles of reintensification treatment
prior to maximize the anti-leukemic kill before transplant.
Dexamethasone 20 mg/m2 PO days 1-3 Cytarabine 2 g/m2 IV x 4 doses, days 3-5 Etoposide 100
mg/m2 IV x 5 doses, days 3-5 L-asparaginase 25,000 Units/m2 IM day 6 Intrathecal treatment
Continuation Treatment (lasts 120 weeks for girls and 146 weeks for boys)
Treatment will depend on risk classification: low versus standard versus high risk
Treatment weeks 1 to 20:
Week Standard/High Risk Low Risk
1. DEX + DOX + VCR + 6MP + ASP 6MP + DEX + VCR
2. 6MP + ASP 6MP + MTX
3. 6MP + ASP 6MP + MTX
4. DEX + DOX + VCR + 6MP + ASP 6MP + DEX + VCR
5. 6MP + ASP 6MP + MTX
6. 6MP + ASP 6MP + MTX
7. Reinduction I§ Reinduction I
8. Reinduction I Reinduction I
9. Reinduction I Reinduction I
10. 6MP + ASP 6MP + MTX
11. DOX + VCR + 6MP + ASP 6MP + MTX
12. 6MP + ASP 6MP + MTX
13. 6MP + ASP 6MP + MTX
14. DEX + DOX + VCR + 6MP + ASP 6MP + DEX + VCR
15. 6MP + ASP 6MP + MTX
16. 6MP + ASP 6MP + MTX
17. Reinduction II Reinduction II
18. Reinduction II Reinduction II
19. Reinduction II Reinduction II
20. No chemotherapy 6MP + MTX
Dexamethasone 12 mg/m2 (std/high risk) or 8 mg/m2 (low risk) PO daily (tid) x 5 days,
Days 1-5 Doxorubicin 30 mg/m2 IV, Day 1 Vincristine 2.0 mg/m2 IV push (max. 2 mg), Day
1 Mercaptopurine 50 mg/m2 PO daily x 7 days (std/high risk), Days 1-7 75 mg/m2 PO daily
x 7 days (low risk), Days 1-7 L-asparaginase 25,000 Unit/m2 IM, Day 1 Methotrexate 40
mg/m2 IV or IM, Day 1
Reinduction I and II
This phase of treatment will be started at weeks 7 and 17 after bone marrow examination
confirms complete remission. Reinduction treatment will be given twice: weeks 7 to 9
and weeks 17 to 19 for all patients.
Reinduction I for Standard/High Risk ALL:
Dexamethasone 8 mg/m2/day PO (t.i.d.) Days 1-8, 15, 21, Vincristine 1.5 mg/m2/week IV
(max 2 mg) Days 1, 8, 15, Doxorubicin 30 mg/m2 Days 1, 8, L-asparaginase 25,000 Unit/m2
IM Days 1, 8, 15, Intrathecal chemotherapy, dose age dependent Day 1.
Reinduction II for Standard/High Risk ALL:
Dexamethasone 8 mg/m2/day PO (t.i.d.) Days 1-8, 15-21, Vincristine 1.5 mg/m2/week IV
(max 2 mg) Days 1, 8, 15, L-asparaginase 25,000 Unit/m2, weekly IM Days 1, 8, 17,
Intrathecal chemotherapy, dose age dependent Day 1 High-dose cytarabine 2 gm/m2 IV q 12
Days 15, 16
Reinduction I and II for Low Risk ALL Dexamethasone 8 mg/m2/day PO (t.i.d.) Days 1-8,
15-21 Vincristine 1.5 mg/m2/week IV (max 2 mg), Days 1, 8, 15 L-asparaginase 10,000
Unit/m2/thrice weekly IM Days 2, 4, 6, 8, 10, 12, 15, 17, 19 Doxorubicin 30 mg/m2/week
IV Day 1 Intrathecal chemotherapy, dose age dependent on Day 1
Treatment Weeks 21 to end of therapy Week Standard/High Risk Low Risk
21. 6MP + MTX 6MP + MTX
22. 6MP + MTX 6MP + MTX
23. Cyclo + Ara-C 6MP + MTX
24. DEX + VCR 6MP + DEX + VCR
25. 6MP + MTX 6MP + MTX
26. 6MP + MTX 6MP + MTX
27. Cyclo + Ara-C 6MP + MTX
28. DEX + VCR 6MP + DEX + VCR
Mercaptopurine 75 mg/m2 PO, daily x 7 days, Days 1-7 Methotrexate 40 mg/m2 IV or IM, Day 1
Cyclophosphamide 300 mg/m2 IV, Day 1 Cytarabine 300 mg/m2 IV, Day 1 Dexamethasone 12 mg/m2
(std/high risk) or 8 mg/m2 (low risk) PO daily (tid) x 5, Day 1-5 Vincristine 2.0 mg/m2 IV
push (max. 2 mg), Day 1
The same treatment (weeks 21-28) will be repeated for a total of 6 times (until week 68).
After week 68, all patients will receive daily 6MP and weekly MTX with pulses of
dexamethasone and vincristine every 4 weeks until week 100, after which only 6MP and
methotrexate will be given. Intrathecal treatment will be given every 8 weeks only to
patients at high risk of CNS relapse after week 48 and will be discontinued after week 96.
Continuation therapy will be discontinued after 120 weeks in girls and after 146 weeks in
Patients who meet the criteria of high-risk ALL are candidates for allogeneic hematopoietic
stem cell transplantation. However, if the option is declined by the patients or guardians,
or the procedure is deemed unsuitable by the attending physician and the principal
investigator, the patient will remain on study and continue to receive chemotherapy
Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment
Overall Event-free Survival (EFS)
EFS was measured from the start of on-study to the date of first treatment failure of any kind (relapse, death, lineage switch, or second malignancy) or to the last date of follow-up. Failure to enter remission was considered an event at time zero. Measurement was determined by Kaplan-Meyer estimate.
Median follow-up time (range) 5.6 (1.3 to 8.9) years
Ching-Hon Pui, M.D.
St. Jude Children's Research Hospital
United States: Food and Drug Administration
|Cook Children's Medical Center||Fort Worth, Texas 76104|
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