Newly-diagnosed Pediatric T-cell ALL Protocol

Condition(s) studied

Investigational drug(s) / intervention(s)

Venetoclax: All T-ALL patients will receive 8 mg/m2/day dexamethasone in induction therapy. For all ETP/near-ETP T-ALL patients, venetoclax will replace daunorubicin in induction therapy. CAT will replace CAT+ during early intensification. Venetoclax will replace daunorubicin in interim therapy 2 and 4. In maintenance therapy 2, the CTX+Ara-C treatment cycles are reduced to 5, in order to minimize the impact of alkylating agents on fertility.

Dasatinib: All T-ALL patients will receive 8 mg/m2/day dexamethasone in induction therapy. All non-ETP T-ALL patients will receive dasatinib after initial window phase in induction therapy. For non-ETP T-ALL patients with MRD \<0.01% on day 46, CAT will replace CAT+ during early intensification, and patients will be continuously subjected to dasatinib combined with chemotherapy during early intensification, interim tharapy, reinduction therapy and maintenance therapy. In maintenance therapy 2, the CTX+Ara-C treatment cycles are reduced to 5, in order to minimize the impact of alkylating agents on fertility.

homoharringtonine: All T-ALL patients will receive 8 mg/m2/day dexamethasone in induction therapy. All non-ETP T-ALL patients will receive dasatinib after initial window phase in induction therapy. For non-ETP T-ALL patients with MRD ≥0.01% on day 46，CAT+ will be replaced with randomized doses of homoharringtonine (HHT) during early intensification, and HHT will be administrated during reinduction therapy. In maintenance therapy 2, the CTX+Ara-C treatment cycles are reduced to 5, in order to minimize the impact of alkylating agents on fertility.

Study summary

This is a prospective, multicenter study conducted within the Chinese Children's Cancer Group (CCCG). The study aims to evaluate whether the addition of three novel agents, dasatinib, venetoclax and homoharringtonine, can improve the minimal residual disease (MRD)-negative remission rate, enhance event-free survival (EFS), and reduce the cumulative incidence of relapse (CIR) in pediatric patients with newly diagnosed T-cell acute lymphoblastic leukemia (T-ALL).

Eligibility

Primary outcome measure(s)

• End-of-induction(EOI) measurable residual diseases (MRD)-negativity rate in patients with non-ETP T-ALL treated with dasatinib plus 4-drug induction compared to those treated with 4-drug induction in CCCG-ALL-2020 — The expected study duration is approximately 5 years.
  For this objective a one-sided comparison of probabilities (proportions) will be made. Let p1 and p2 be the probability of aciieving negative EOI MRD on the CCCG-ALL-2020 (historical control) and the current study respectively, then the one-sided alternative hypothesis H0: p2=p1 vs. H1: p2\>p1 will be tested. The procedure of two-sample comparison of proportions with the Z-statistic (Normal approximation) will be applied. The current CCCG-ALL2020 data show that among 573 evaluable patients 510 (89%) achaived negative EOI MRD. Benchmarking on these as historical data, a total sample size of n=550 and interim sample size n1=300 provides sufficient popwer for the planned analyses outlined above if the true MRD negativity probability is 0.92 or higher, as shown in the table below. An interim analysis at n1=300 evaluable patients will be conducted for possible abstract submission or publication.
• For non-ETP T-ALL patients with positive measurable residual diseases (MRD) on day 46, to compare MRD-negativity rate before consolidation between those receiving single agent homoharringtonine at dose of 1mg/m2 vs. 2mg/m2 for 7 days — The expected study duration is approximately 5 years.
  The comparison will be condicted by testing the two-sided hypothesis H0: p1=p2 vs. H1: p1≠p2, using the Z test (normal approximation) at alpha=0.10 level. The investigators anticipate approximately 40 patients available to be randomized. The participants will be randomized at 1:1 ratio into the two treatment arms, with 20 patients per arm. Stratified block-wise randomization will be applied with block size of 4. The randomization will be stratified by the EOI MRD level as \<1% and \>=1%.
• End of induction (EOI) measurable residual diseases (MRD)-negativity rate with venetoclax plus 3-drug induction, compared to those treated with 4-drug induction on CCCG-ALL-2020 in treating ETP/near-ETP T-ALL. — The expected study duration is approximately 5 years.
  The investigators anticipate at least 60 evaluable ETP participants. The analysis will be conducted by testing H0: p2=p1 vs. H1: p2\>p1, where p1, p2 are MRD-negative probabilities in the CCCG-ALL-2020 and the current study respectively. The Z-statistic (normal approximation) based procedure will be applied.
• In interim therapies 2 and 4, venetoclax replaced daunorubicin to evaluate whether this change could improve event-free survival compared to similar patients on CCCG-ALL-2020 in treating ETP/near-ETP T-ALL. — The expected study duration is approximately 5 years.
  The investigators anticipate at least 60 evaluable participants. The event-free survival function will be estimated by the Kaplan-Meier method. Comparison will be conducted using the two-sided log-rank test.

Trial sites (27)

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