X4P-001-110

1) Diagnosis of congenital or acquired primary autoimmune and idiopathic chronic neutropenic disorder ≥6 months prior to the screening visit that is not attributable to medications, active or recent infections or malignancy.

2) Have a confirmed trough ANC <1500 cells/µL during the screening visit (single ANC measurement) and at baseline visit (mean ANC over 6 hours) held at least 2 weeks prior to Day 1 dosing, with no clinical evidence of infection.

3) Prior history of recurrent and/or serious infections during the 12 months preceding the screening visit (that is, suffering sequelae of chronic neutropenia), as defined by having at least 2 infections in the last 12 months that meet at least 1 of the following criteria:
|— a) Infection requiring the use of antibiotics (intravenous [IV]/oral/topical).
|— b) Infection requiring a visit to healthcare facility (including but not limited to emergency room visit, urgent care facility, primary care physician’s office, or in-patient hospitalization).

4) Participants who are on G-CSF or other active background therapy must have been receiving these therapies for ≥12 months, be on a stable dose and dosing schedule for ≥4 weeks prior to screening visit and remain on this dose and dosing schedule throughout the study (unless ANC >10,000 cells/µL for ≥4 weeks).

5) Participants must be willing to keep their G-CSF or other background therapy doses/regimens stable (other than for safety reasons) for the duration of the study.

1) A diagnosis of secondary neutropenia including those due to:
|— a) Hypersplenism.
|— b) Infection.
|— c) Malignancy.
|— d) Autoimmune disease, for example, systemic lupus erythematosus, rheumatoid arthritis, irritable bowel disease, graft-versus-host disease, thyroid disease.
|— e) Nutritional deficiency, for example, vitamin B12, folic acid, copper, caloric malnutrition.
|— f) Drug-induced cause, for example, chemotherapy, clozapine, antiretrovirals, antibiotics, monoclonal antibodies.

2) A diagnosis of any of the following:
|— a) Aplastic anemia.
|— b) Warts, hypogammaglobulinemia, infections, and myelokathexis (WHIM) syndrome
|— c) Certain Congenital Neutropenias, including but not limited to these classifications are excluded:
|— — ~) Isolated with a cyclic presentation, for example, elastase, neutrophil expressed (ELANE).
|— — ~) Associated with immune dysregulation, for example, autoimmune lymphoproliferative syndrome, Familial hemophagocytic lymphohistiocytosis, Chédiak-Higashi syndrome.
|— — ~) Associated with bone marrow failure, for example, Fanconi Anemia, Diamond-Blackfan anemia, Telomere diseases.
|— d) Neutropenia associated with a Duffy-null phenotype (formerly known as benign ethnic neutropenia).

3) A medical or personal condition that may potentially compromise the safety of the participant, may preclude the participant’s successful completion of the clinical study, or could, in the opinion of the Investigator or the Sponsor, interfere with the objectives of the study.

4) Received more than 1 dose of mavorixafor in the past.

5) Received C-X-C chemokine receptor 4 (CXCR4) antagonist (other than mavorixafor) in the past 6 months.

6) Participants taking pegylated-G-CSF unless they have a diagnosis of congenital neutropenia confirmed at screening.

7) Participant is currently taking or have taken other investigational drug at least 30 days prior to the screening visit.

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