Aprea Therapeutics, Inc. is conducting, supporting, and planning multiple clinical trials of eprenetapopt (APR-246) and APR-548: Pivotal Phase 3 MDS Trial—In December 2020, the company announced its pivotal Phase 3 randomized, controlled trial evaluating eprenetapopt with azacitidine as frontline therapy in HMA-naïve TP53 mutant myelodysplastic syndromes (MDS) patients failed to meet its predefined primary endpoint of complete remission (CR) rate. Analysis of the primary endpoint at this data cut demonstrated a 53% higher number of patients achieving a CR in the experimental arm receiving eprenetapopt with azacitidine versus the control arm receiving azacitidine alone but did not reach statistical significance. The company is completing analysis from this Phase 3 clinical trial and expects to present additional information in the second quarter of 2021. Phase 2 MDS/AML Post-Transplant Trial – The company has completed enrollment of 33 patients in a single-arm, open-label Phase 2 clinical trial evaluating eprenetapopt with azacitidine as post-transplant maintenance therapy in TP53 mutant MDS and AML patients who have received an allogeneic stem cell transplant. The company anticipates initial results from the primary endpoint of relapse-free survival at 12 months in the second quarter of 2021. Phase 1/2 AML Trial – The company is currently enrolling a Phase 1/2 clinical trial evaluating the safety, tolerability, and preliminary efficacy of eprenetapopt therapy in TP53 mutant AML patients. The lead-in portion of the trial evaluated the tolerability of eprenetapopt with venetoclax, with or without azacitidine, and no dose-limiting toxicities were observed in 12 patients receiving either regimen. Based on these results, the Company has expanded the trial to treat 33 additional frontline TP53 mutant AML patients with the combination of eprenetapopt, venetoclax and azacitidine. In the 19 frontline AML patients who are evaluable for efficacy with the triplet regimen, the company has observed a 63% CR + CRi composite response rate and a 31% CR rate. The company anticipates completion of enrollment in the triplet regimen expansion cohort during the second quarter of 2021 with availability of preliminary response rate data from the cohort also in the second quarter of 2021. Phase 1 NHL Trial – The company is currently enrolling a Phase 1 clinical trial in relapsed/refractory TP53 mutant chronic lymphoid leukemia (CLL) assessing eprenetapopt with venetoclax and rituximab and eprenetapopt with ibrutinib in order to further assess eprenetapopt in hematological malignancies. The first patient was enrolled in the first quarter of 2021. The company is also planning to evaluate the combination of eprenetapopt with venetoclax in relapsed/refractory mantle cell lymphoma. Phase 1/2 Solid Tumor Trial – The company is currently enrolling a Phase 1/2 clinical trial in relapsed/refractory gastric, bladder and non-small cell lung cancers assessing eprenetapopt with anti-PD-1 therapy. The dose-escalation phase of the trial enrolled 6 patients with advanced solid tumors and no dose-limiting toxicities were observed. Based on these results, the company is enrolling expansion cohorts for patients with advanced gastric, bladder and non-small cell lung cancers and has currently enrolled 8 patients across these expansion arms. APR-548 -- The company’s second product candidate, APR-548, is a next-generation p53 reactivator that is being developed in an oral dosage form. The company has planned a Phase 1 dose-escalation clinical trial evaluating the safety, tolerability, and preliminary efficacy of APR-548 with azacitidine in frontline and relapsed/refractory MDS patients. The company anticipates the first patient to be enrolled early in the second quarter of 2021.