On May 4, 2023 X4 Pharmaceuticals Inc. (Nasdaq: XFOR), a leader in the discovery and development of novel small-molecule therapeutics to benefit people with rare diseases of the immune system, reported financial results for the first quarter ended March 31, 2023 and highlighted key upcoming expected milestones (Press release, X4 Pharmaceuticals, MAY 4, 2023, View Source [SID1234631061]).

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"This is an exciting time at X4 as we look forward to delivering on several expected major milestones throughout the rest of 2023," said Paula Ragan, Ph.D., President and Chief Executive Officer of X4 Pharmaceuticals. "As we recently announced, we will be presenting additional data on secondary endpoints, including results on infection burden among other outcomes metrics, from the Phase 3 trial of mavorixafor in those diagnosed with WHIM syndrome at the upcoming annual meeting of the Clinical Immunology Society; a May 16 company webinar with clinical experts will be followed by an oral data presentation on May 21 at the conference. Additionally, we continue to anticipate submission of our first U.S. New Drug Application for mavorixafor early in the second half of the year. We are also continuing to advance mavorixafor through a Phase 2 clinical trial in people with certain Chronic Neutropenic disorders and expect to provide clinical and regulatory path updates in the second or third quarter of this year."

Recent and Key Anticipated Upcoming Milestones

Additional Data from the Phase 3 4WHIM Trial to be Presented at Upcoming CIS Meeting:
•In late 2022, the company announced that its Phase 3 clinical trial evaluating once-daily, oral mavorixafor in people with WHIM (Warts, Hypogammaglobulinemia, Infections, and Myelokathexis) syndrome met its primary endpoint and first key secondary endpoint, with mavorixafor achieving statistically significant and clinically relevant longer times above threshold levels for both absolute neutrophil and absolute lymphocyte counts versus placebo and demonstrating good tolerability in the trial.
•Subsequently, X4 announced that its submitted late-breaker abstract entitled "Results of a Phase 3 Trial of an Oral CXCR4 Antagonist, Mavorixafor, for Treatment of Patients With WHIM

Exhibit 99.1
Syndrome" was accepted for oral presentation at the Annual Meeting of the Clinical Immunology Society (CIS), which is taking place May 18-21, 2023, in St. Louis, MO.
◦Dr. Raffaele Badolato, Professor of Pediatrics at the University of Brescia (Italy) and an investigator in the 4WHIM clinical trial, will present at 11:30 am CT on Sunday, May 21. Although the session will only be accessible live to conference attendees, X4 will post the slides on its website concurrent with the presentation.

X4 to Host May 16th Webinar Highlighting Infection Data from Phase 3 4WHIM Clinical Trial:
•The company will be hosting a virtual event to present and discuss new data from the 4WHIM Phase 3 clinical trial at 4:00 pm ET on Tuesday, May 16, 2023, following the expected publication of the accepted CIS abstracts.
•New data to be presented during the event will focus on additional secondary endpoints, including the impact of mavorixafor on the rate, severity, and duration of infections, among other outcomes metrics, as measured during the 52-week trial period. Registration for the event can be completed here.
•The event will include commentary from several WHIM patients and from a diverse panel of global clinical experts who manage those with WHIM syndrome and/or certain chronic neutropenic disorders. These experts include:
i.Charlotte Cunningham-Rundles, MD, PhD, The David S. Gottesman Professor, Departments of Medicine and Pediatrics, The Prism Immunology Institute, The Icahn School of Medicine at Mount Sinai;
ii.Jean Donadieu, MD, PhD, Pediatrician, Hemato oncologic department of Trousseau Hospital, Coordinator of the French Histiocytosis registry, Coordinator of the pediatric branch of the French histiocytosis reference center;
iii.Peter E. Newburger, MD, Editor, Pediatric Blood & Cancer, Professor of Pediatrics and Molecular, Cell, and Cancer Biology, UMass Chan Medical School;
iv.Akiko Shimamura, MD, PhD, Professor of Pediatrics, Harvard Medical School and Director, Bone Marrow Failure and Myelodysplastic Syndrome Program, Boston Children’s Hospital; and
v.Teresa K. Tarrant, MD, FAAAAI, Associate Professor of Medicine, Duke University School of Medicine, Director, Clinical Immunology Laboratory DUHS, Vice Chief of Translational Research for Rheumatology and Immunology.

•During the May 16th event, the company also expects to provide an update on its U.S. regulatory activities in support of its U.S. New Drug Application-submission for mavorixafor for the treatment of WHIM syndrome, which continues to be expected early in the second half of 2023.

Advancing Mavorixafor in Chronic Neutropenic Disorders:
•In September 2022, X4 presented positive data from a Phase 1b clinical trial demonstrating the ability of one dose of oral mavorixafor to increase and normalize absolute neutrophil counts (ANC) in people with idiopathic, cyclic, or congenital chronic neutropenia as monotherapy or administered concurrently with injectable granulocyte colony-stimulating factor (G-CSF).
•The Phase 1b trial has been expanded into a Phase 2 clinical trial to assess the long-term durability, safety, and tolerability of oral mavorixafor in a larger population with idiopathic, cyclic, or congenital chronic neutropenia.
•Participants are currently being enrolled in this Phase 2 trial and X4 anticipates announcing clinical data and clarity on the scope and timing of the expected Phase 3 clinical program for mavorixafor in these Chronic Neutropenic disorders in the second or third quarter of 2023.

Exhibit 99.1
•X4 also announced today that its abstract, entitled "Incidence of Serious Infection Events in People With Chronic Neutropenia—Analysis of Real-World Data From Patients in the United States," was accepted for poster presentation at CIS on Saturday, May 20, 2023 at 1:30 pm CT. This poster will be added to the publications section of the X4 website at the time of the presentation.

First Quarter 2023 Financial Results
•Cash, Cash Equivalents & Restricted Cash: X4 had $94.4 million in cash, cash equivalents, and restricted cash as of March 31, 2023. X4 believes that it has sufficient funds to support company operations into the second quarter of 2024.
•Research and Development (R&D) Expenses were $22.1 million for the first quarter ended March 31, 2023 as compared to $14.1 million for the comparable period in 2022. R&D expenses for the first quarter ended March 31, 2023 included $0.8 million of certain non-cash expenses and a $5.0 million accrual for an in-licensing milestone payment that the company deems probable of occurring.
•Selling, General and Administrative Expenses (SG&A) were $7.2 million for the first quarter ended March 31, 2023 as compared to $7.7 million for the comparable period in 2022. SG&A expenses included $0.8 million of certain non-cash expenses for the first quarter ended March 31, 2023.
•Net Loss: X4 reported a net loss of $24.0 million for the first quarter ended March 31, 2023, as compared to $22.0 million for the comparable period in 2022. Net loss included $1.6 million of stock-based compensation expense and a $5.4 million gain for the change in fair value of the company’s Class C warrant liability for the first quarter ended March 31, 2023.

Conference Call and Webcast
X4 will host a conference call and webcast today at 8:30 am ET to discuss these financial results and business highlights. The conference call can be accessed by dialing 1-855-327-6837 from the United States or 1-631-891-4304 internationally, followed by the conference ID: 10021600. The live webcast can be accessed on the investor relations section of X4 Pharmaceuticals’ website at www.x4pharma.com. Following the completion of the call, a webcast replay of the conference call will be available on the website.