A Phase I trial of revumenib in combination with 7+3+midostaurin for the frontline treatment of NPM1 and FLT3 mutated AML

This research is being conducted to determine a safe and effective dose of revumenib that
can be given in combination with standard induction (initial therapy to induce a
remission) + FLT3 targeted therapy (midostaurin) and a single cycle of post-remission
therapy + FLT3 targeted therapy (midostaurin) to participants with newly diagnosed
Nucleophosmin (NPM1) and FMS-like tyrosine kinase 3 (FLT3) mutated Acute Myeloid Leukemia
(AML).

The names of the study drugs involved in this study are:

- Revumenib (SNDX-5613) (a type of menin inhibitor)

- Midostaurin (a type of multi-kinase including FLT3 inhibitor)

- Cytarabine (a type of antineoplastic agent)

- Daunorubicin (a type of antineoplastic agent)

Inclusion Criteria:

- Patients with AML who are newly diagnosed according to the WHO 2022 Classification
and previously untreated except for hydroxyurea. ATRA pretreatment for suspected APL
for less than 5 days is allowed. Eligible patients with AML arising from an
antecedent hematologic disease (AHD) including MDS, may have been treated for their
prior hematologic disease (except for allogenic transplant).

- Patients must be ≥ 18 and < 75 years old.

- Eastern Cooperative Oncology Group (ECOG) Performance status of 0 to 2.

- Presence of FLT3-ITD and/or TKD mutation(s) AND NPM1 mutation in bone marrow or
peripheral blood

- Dose escalation phase only: Presence of any of the following adverse risk genetic
characteristics:

- 2022 ELN adverse risk genetic features:

- t(6;9)(p23.3;q34.1)/DEK::NUP214

- t(v;11q23.3)/KMT2A-rearranged

- t(9;22)(q34.1;q11.2)/BCR::ABL1

- t(8;16)(p11.2;p13.3)/KAT6A::CREBBP

- inv(3)(q21.3q26.2) or t(3;3)(q21.3;q26.2)/ GATA2, MECOM(EVI1)

- t(3q26.2;v)/MECOM(EVI1)-rearranged

- -5 or del(5q); -7; -17/abn(17p)

- Complex karyotype, monosomal karyotype

- Mutations in either one of these genes: ASXL1, BCOR, EZH2, RUNX1, SF3B1,
SRSF2, STAG2, U2AF1, and/or ZRSR2

- Mutated TP53

- NPM1 + FLT3-ITD + DNMT3A mutation

- LVEF ≥ 50% by MUGA or ECHO at screening.

- Adequate renal function as demonstrated by a calculated creatinine clearance ≥ 60
mL/min; determined by the Cockcroft Gault formula.

- Adequate liver function as demonstrated by:

- aspartate aminotransferase (AST) ≤ 2.5 × ULN*

- alanine aminotransferase (ALT) ≤ 2.5× ULN*

- total bilirubin ≤ 1.5 × ULN* * Unless considered due to leukemic organ
involvement. Note: Subjects with Gilbert's Syndrome may have a total bilirubin
> 1.5 × ULN per discussion with the Sponsor-Investigator

- Resolution of adverse reactions to prior drug therapy (such as hydroxyurea) to ≤
grade 1

- Eligible for intensive cytarabine/daunorubicin (7+3) chemotherapy based on the
opinion of the treating physician.

- Male subjects must agree to refrain from unprotected sex and sperm donation from
initial study drug administration until 90 days after the last dose of study drug.

- Females of childbearing potential (i.e., not postmenopausal for at least 1 year or
not surgically sterile) must have negative results by a serum or urine pregnancy
test performed within 7 days of day 1.

- Ability to understand and the willingness to sign a written informed consent
document. (Providing consents in as many languages as possible is encouraged)

- Consolidation should occur between 1-4 weeks following count recovery after
induction and remission (must be confirmed by labs to document maximal response) is
established. Subjects will receive medium intensity cytarabine -based consolidation
in combination with midostaurin and revumenib if the following criteria are
fulfilled.

- an induction response < 5% blasts in the bone marrow and ANC >1000 and PLT
>75000 for whom documented path report is submitted.

- sufficiently fit (performance status <3)

- resolution of any adverse reactions to no greater than grade 1 severity

Exclusion Criteria:

- Subject has acute promyelocytic leukemia, inversion (16), t(8;21) AML as described
below. Contact Sponsor-Investigator with questions. Inversion 16 and t(8;21): CBF
chromosomal abnormalities may be assessed by molecular (PCR), metaphase
cytogenetics, or FISH.

- Subject has known active CNS involvement with AML.

- Subject has received a strong CYP3A4 inducer (APPENDIX C) within 7 days prior to the
initiation of study treatment

- Strong CYP3A4 inhibitors (APPENDIX C) are contraindicated except strong CYP3A4
inhibitor antifungal azole medications (systemic itraconazole, ketoconazole,
posaconazole, voriconazole). For strong CYP3A4 inhibitor antifungal azole
medications, the starting dose of revumenib has to be adjusted (Table 1).

- QTc using Fridericia's correction [QTcF]) > 450 msec. Drugs that prolong QTc should
be avoided if possible. A list of common QTc prolonging drugs and alternatives that
are not QTc prolonging can be found in APPENDIX D.

- Subject has tested positive for HIV (due to potential drug-drug interaction between
antiretroviral medications and Midostaurin/revumenib). Note: HIV testing is not
required.

- Subject is known to be positive for hepatitis B or C infection with the exception of
those with an undetectable viral load within 3 months. (Hepatitis B or C testing is
not required). Subjects with serologic evidence of prior vaccination to HBV [i.e.,
HBs Ag-, and antiHBs+] are allowed.

- Subject has consumed grapefruit, grapefruit products, Seville oranges (including
marmalade containing Seville oranges) or Star fruit within 3 days prior to the
initiation of study treatment.

- Subject has a cardiovascular disability status of New York Heart Association Class ≥
2. Class 2 is defined as cardiac disease in which patients are comfortable at rest
but ordinary physical activity results in fatigue, palpitations, dyspnea, or anginal
pain.

- Subject has a significant history of renal, neurologic, psychiatric, endocrinologic,
metabolic, immunologic, hepatic, cardiovascular disease, or any other medical
condition that in the opinion of the investigator would adversely affect his/her
participating in this study.

- Subject has chronic respiratory disease that requires continuous oxygen use.

- Subject has a malabsorption syndrome or other condition that precludes enteral route
of administration.

- Subject exhibits evidence of other clinically significant uncontrolled condition(s)
including, but not limited to uncontrolled systemic infection.

- Subject has a history of other malignancies prior to study entry, with the exception
of:

- Adequately treated in situ carcinoma of the cervix uteri or carcinoma in situ
of breast;

- Basal cell carcinoma of the skin or localized squamous cell carcinoma of the
skin;

- Previous malignancy confined and surgically resected (or treated with other
modalities) with curative intent.

- Prior malignancies treated with (surgery+/- chemotherapy+/- radiation) that
have remained disease free for at least two years after completion of therapy

- Subject treated with any form of chemotherapy, immunotherapy, or investigative agent
within 1 month of enrollment.

- Patients who have had prior exposure to a menin inhibitor.