CLAG-GO for Patients With Persistent, Relapsed or Refractory AML

  • End date
    Feb 9, 2025
  • participants needed
  • sponsor
    University of Maryland, Baltimore
Updated on 9 April 2023
graft versus host disease
flow cytometry
immunosuppressive agents
cell transplantation
hematologic disorder
induction chemotherapy
refractory acute myeloid leukemia (aml)
acute promyelocytic leukemia
colony stimulating factor
gemtuzumab ozogamicin
chemotherapy drugs


This study involves evaluating a combination of chemotherapy drugs known as "CLAG-GO" [cladribine, cytarabine, granulocyte-colony stimulating factor (G-CSF) and gemtuzumab ozogamicin (GO)] in the treatment of acute myeloid leukemia (AML) that has not responded well to standard therapy or has returned after an initial remission (relapsed). The trial will be conducted at the University of Maryland Greenebaum Comprehensive Cancer Center (UMGCCC). Potential participants will go through a screening period to see if they are eligible to join the study. If eligible, participants will be hospitalized for 4-5 weeks to receive study treatment with CLAG-GO, called induction chemotherapy. If tests show that the cancer is in remission after induction chemotherapy, participants may undergo further chemotherapy (known as consolidation) or may proceed with bone marrow/stem cell transplantation. Patients who receive consolidation chemotherapy and remain in remission may have up to 8 cycles of outpatient maintenance therapy. A cycle lasts about 28 days. All participants will be monitored carefully for both side effects and to see if the study treatment is working. Lab tests and exams will be conducted throughout the entire study. In addition, special studies will be done at various time points to try to understand better how the drugs work and which patients are likely to respond best.


This is a single-arm, two-stage phase II trial of cladribine, cytarabine, granulocyte colony stimulating factor and gemtuzumab ozogamicin (CLAG-GO) in adult patients with acute myeloid leukemia (AML) who are either have persistent disease after initial induction chemotherapy or are in first relapse, with early stopping for unacceptable toxicity. The trial will be conducted at the University of Maryland Greenebaum Comprehensive Cancer Center (UMGCCC), with a target enrollment of 39 patients if the trial proceeds to the second stage. Eligible patients will receive induction chemotherapy with CLAG-GO at the doses detailed below. In the first stage of the trial, a sequential boundary is used to monitor induction mortality and halt accrual if this mortality is significantly above 10%. If more than 6 responses are seen in the initial 19 patients, 20 additional patients will be enrolled in the 2nd stage. Responders may proceed to allogeneic hematopoietic stem cell transplantation (alloHSCT) at any time after induction, and these patients will be monitored for at least 30 days post-transplantation for veno-occlusive disease. Responding patients will also have the option of having a single cycle of consolidation therapy using the same CLAG-GO regimen, followed by maintenance with GO monotherapy for up to 8 additional cycles. Responses will be categorized according to the European LeukemiaNet (ELN) response criteria for AML. Assessment of measureable residual disease (MRD) will be conducted with bone marrow aspirate samples and changes in immunophenotype will be evaluated. In addition, single nucleotide polymorphism (SNP) analysis and sialylation status of CD33, along with sialidase activity of myeloblasts will be evaluated and correlated with responses and survival times. Safety and toxicity will be evaluated continuously, and event-free survival, and overall survival as well as the proportion of patients proceeding to receive alloHSCT will be estimated.

Condition Acute Myeloid Leukemia, Adult, Acute Myeloid Leukemia Recurrent, Acute Myeloid Leukemia, Relapsed, Adult
Treatment Cladribine, Cytarabine, and Granulocyte-Colony Stimulating Factor with Fractionated Gemtuzumab Ozogamicin (CLAG-GO)
Clinical Study IdentifierNCT04050280
SponsorUniversity of Maryland, Baltimore
Last Modified on9 April 2023


Yes No Not Sure

Inclusion Criteria

Adult patients age 18 years or older, with a pathologically confirmed diagnosis of AML [excluding acute promyelocytic leukemia (APL)] according to WHO criteria. AML may be de novo, or following a prior hematologic disease and/or therapy-related
Patients must have relapsed after or be refractory to at least one course of an intensive chemotherapy regimen, for example anthracycline/cytarabine ("7+3" or daunorubicin and cytarabine liposome). Patients with residual disease on day 13-22 of initial induction chemotherapy are eligible, provided the bone marrow cellularity is ≥ 30% AND bone marrow blasts are ≥ 20%. Hypomethylating agents such as azacitidine or decitabine are allowed as a prior therapy, but are not considered an intensive chemotherapy regimen
Eastern Cooperative Oncology Group performance status of 0-2
Any systemic chemotherapy and any radiotherapy must be completed at least 7 days prior to initiation of protocol therapy, with the exception of hydroxyurea or 6-mercaptopurine for cytoreduction
At least 20% expression of CD33 as determined by flow cytometry or immunohistochemical staining
Adequate renal function, defined as a serum creatinine less than 1.8 mg/dL
Adequate hepatic function, defined as a direct bilirubin less than 2 times the institutional upper limit of normal (ULN) and AST, ALT and Alkaline Phosphatase less than 3 times the ULN
Patients who relapse after allogeneic hematopoietic stem cell transplantation are eligible, provided they are at least 60 days from stem cell infusion, do not have > grade 1 graft versus host disease, and have been off all immunosuppressive therapy for at least 2 weeks
Female patients of childbearing potential must have a negative pregnancy test and agree to use an adequate method of contraception as defined by the protocol. This must persist through the treatment period until at least 6 months after the last dose of chemotherapy or GO
Male subjects who are able to father children and are having intercourse with females of childbearing potential must also agree to an acceptable method of contraception through the treatment period until at least 3 months after the last dose of chemotherapy or GO, and must refrain from sperm donation during this period
Ability to give written informed consent

Exclusion Criteria

Patients with acute promyelocytic leukemia (FAB-M3) or chronic myelogenous leukemia in blast phase
Isolated myeloid sarcoma. Patients must have marrow involvement with AML to enter the study
Patients with known active AML involvement of the central nervous system
Prior treatment with gemtuzumab ozogamicin or cladribine for AML. Prior treatment with cytarabine is permitted
As patients will be receiving G-CSF prior to chemotherapy, patients presenting with symptomatic leukostasis (as judged by the investigator) are excluded. Hydroxyurea, 6-mercaptopurine and/or leukapheresis for blast count control (see inclusion criterion #4) for patients with asymptomatic hyperleukocytosis is permitted before starting treatment, but must be stopped for at least 24 hours prior to starting protocol treatment
Active uncontrolled infection. Patients on prophylactic antibacterial, antifungal, and/or antiviral agents and patients whose infections are controlled with these agents are eligible
Known active hepatitis B or C or other known active hepatic disorder
Any history of veno-occlusive disease (VOD)/sinusoidal obstruction syndrome (SOS)
Active concurrent malignancy, unless disease-free for at least 3 years. Subjects with treated non-melanoma skin cancer, in situ carcinoma or cervical intraepithelial neoplasia, regardless of the disease-free duration, are eligible for this study if definitive treatment for the condition has been completed. Patients with organ-confined prostate cancer with no evidence of recurrent or progressive disease are eligible if hormonal therapy has been initiated or the malignancy has been treated surgically or with definitive radiotherapy
Uncontrolled intercurrent illness including, but not limited to, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that per investigator's judgment would limit compliance with study requirements
Clear my responses

How to participate?

Step 1 Connect with a study center
What happens next?
  • You can expect the study team to contact you via email or phone in the next few days.
  • Sign up as volunteer  to help accelerate the development of new treatments and to get notified about similar trials.

You are contacting

Investigator Avatar

Primary Contact


Additional screening procedures may be conducted by the study team before you can be confirmed eligible to participate.

Learn more

If you are confirmed eligible after full screening, you will be required to understand and sign the informed consent if you decide to enroll in the study. Once enrolled you may be asked to make scheduled visits over a period of time.

Learn more

Complete your scheduled study participation activities and then you are done. You may receive summary of study results if provided by the sponsor.

Learn more

Similar trials to consider


Browse trials for

Not finding what you're looking for?

Every year hundreds of thousands of volunteers step forward to participate in research. Sign up as a volunteer and receive email notifications when clinical trials are posted in the medical category of interest to you.

Sign up as volunteer

user name

Added by • 



Reply by • Private

Lorem ipsum dolor sit amet consectetur, adipisicing elit. Ipsa vel nobis alias. Quae eveniet velit voluptate quo doloribus maxime et dicta in sequi, corporis quod. Ea, dolor eius? Dolore, vel!

  The passcode will expire in None.

No annotations made yet

Add a private note
  • abc Select a piece of text from the left.
  • Add notes visible only to you.
  • Send it to people through a passcode protected link.
Add a private note