On June 2, 2024 ALX Oncology Holdings Inc., ("ALX Oncology" or "the Company") (Nasdaq: ALXO), an immuno-oncology company developing therapies that block the CD47 immune checkpoint pathway, reported data from its Phase 1 ASPEN-07 clinical trial in a poster presentation (abstract #4575) at the 2024 American Society of Cancer Oncology ("ASCO") Annual Meeting being held in Chicago from May 31-June 4, 2024 (Press release, ALX Oncology, JUN 2, 2024, https://ir.alxoncology.com/news-releases/news-release-details/alx-oncology-presents-first-evorpacept-combination-data-antibody [SID1234643920]). These findings represent the first evorpacept combination data with an ADC from ASPEN-07’s ongoing, open-label, single-arm, clinical trial of evorpacept in combination with PADCEV (enfortumab vedotin or "EV") in patients with locally advanced or metastatic urothelial cancer ("la/m UC"). Evorpacept is a CD47 blocker with an inactivated Fc effector domain that is designed to minimize associated toxicity.
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Key results as of the data cut-off date of April 3, 2024:
Initial patient demographics
Twenty-eight EV-naïve patients were enrolled with 29% having received three or more prior lines of therapy.
All patients had disease that progressed after platinum chemotherapy and checkpoint inhibition.
Approximately 93% of patients had metastatic disease.
The combination was generally well-tolerated in a heavily pre-treated patient population
No maximum tolerated dose was reached, and the maximum administered evorpacept dose was 30 mg/kg Q2W.
There were no treatment-related deaths in the study.
The most frequent adverse events due to any cause were low-grade fatigue, dysgeusia, nausea, diarrhea, hyperglycemia, and pruritis.
Initial activity showed tumor reduction in the majority of evaluable patients
ASCO poster presentation data-cut reported an unconfirmed overall response rate ("ORR") of 59% (n=22) with evorpacept plus EV (EV single agent ORR benchmark is 41%1).
Following the April data cut-off, four additional response evaluable patients yielded an unconfirmed ORR of 61% (n=26) including two confirmed complete responses and six confirmed partial responses.
To date, 58% of evaluable patients remain in the study.
Continued follow-up for patients who are EV-naïve on ASPEN-07 is ongoing and, enrollment of a new cohort of patients who have received prior EV has begun.
"We are encouraged by the preliminary safety data and clinical activity of evorpacept combined with PADCEV in patients with advanced bladder cancer," said Sophia Randolph, M.D., Ph.D., Chief Medical Officer of ALX Oncology. "To our knowledge, these data are the first demonstration of anti-tumor activity with a CD47 blocker and an ADC in a heavily pre-treated patient population in the clinical setting. With these promising early results, we are evaluating clinical development options in both PADCEV-naïve and experienced patient populations."
"This emerging dataset reported favorable potential for evorpacept to be combined with an ADC in a patient population that has exhausted many treatments," said Jason Lettmann, Chief Executive Officer of ALX Oncology. "We are especially hopeful because of the two patients with confirmed complete responses, which further exhibited this combination is active and that responses could improve over time in more patients. Heading further into the year, we will continue the momentum for ASPEN-07 as we gear up to share multiple, randomized, Phase 2 clinical data readouts where evorpacept is combined with anti-cancer antibodies and checkpoint inhibitors."
The poster can be found on the Publications section of the ALX Oncology website here.
Company Event with ASPEN-07 Principal Investigator and ALX Oncology Management
The Company is hosting a virtual event with key opinion leaders on Friday, June 7, 2024, at 1:00 PM ET. The event will feature leading ASPEN-07 principal investigator and bladder cancer expect, Samuel A. Funt, M.D., from Memorial Sloan Kettering Cancer Center, along with the management team of ALX Oncology. The discussion will cover details of the first promising initial dose escalation data from the Phase 1 ASPEN-07 clinical trial of evorpacept in combination with EV in patients with la/m UC, and how ASPEN-07 could fit into the treatment paradigm of this indication.
Samuel A. Funt, M.D., is a genitourinary oncologist at Memorial Sloan Kettering Cancer Center in New York, NY, where he is also Director of the Inpatient Genitourinary Oncology Service, Director of Bladder Cancer Clinical Trials Operations, and member of the Data Safety Monitoring Committee. Dr. Funt has practiced medicine and been involved in clinical trials for over 10 years. His top areas of clinical expertise are Bladder and Testicular Cancers. Dr. Funt has co-authored over 60 peer-reviewed articles and been awarded research grants from the National Institutes Health, American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper), and the American Cancer Society. His research focuses on the development of more personalized and effective treatments and novel biomarkers of therapeutic response and resistance.
The event will be webcast live and can be accessed by visiting the Investors section of ALX Oncology’s website at www.alxoncology.com and selecting Events under News and Events. To participate in the live event, please register using this link: View Source An archived webcast will be available following the event.
About the Phase 1 Clinical Trial Investigating Evorpacept plus EV in Advanced Bladder Cancer
The Phase 1 clinical trial is an ongoing, open-label, single arm is designed to evaluate the safety, tolerability, and efficacy of evorpacept in combination with EV in patients with la/m UC (NCT05524545). This dose escalation clinical trial has enrolled cohorts receiving 20 mg/kg Q2W or 30 mg/kg Q2W evorpacept plus standard EV treatment. The study is sponsored and conducted by ALX Oncology.
About Bladder Cancer and UC
As estimated by the National Cancer Institute, bladder cancer is the sixth most common cancer type in the United States. UC is the most common type of bladder cancer and accounts for approximately 90% of all bladder cancer cases. Roughly 83,000 new cases of bladder cancer will be diagnosed in the United States in 2024 with about 16,800 deaths. The five-year survival for patients with metastatic bladder cancer is less than 8%. Worldwide, over 614,000 new cases of bladder cancer and over 220,000 deaths occurred in 2022 according to The Global Cancer Observatory.