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[8-K] CytomX Therapeutics, Inc. Reports Material Event

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On August 13, 2025, CytomX Therapeutics provided an update on its CX-2051 Phase 1 study. Dose expansions at 7.2 mg/kg, 8.6 mg/kg, and 10 mg/kg, given every three weeks, have each enrolled approximately 20 patients as planned. The company reported a single Grade 5 treatment-related acute kidney injury in a patient with a complex medical history, including a solitary kidney; the event was believed to be secondary to nausea, vomiting and diarrhea and was reported to the FDA on July 18, 2025. The study's Safety Review Committee convened on July 14, 2025 and supported continued study execution and enrollment.

The CTMX-2051-101 study remains ongoing and a Phase 1 data update is expected by Q1 2026. The filing discloses enrollment progress, the serious adverse event and regulatory reporting but does not provide additional efficacy or broader safety data.

Il 13 agosto 2025 CytomX Therapeutics ha fornito un aggiornamento sullo studio di Fase 1 CX-2051. Le espansioni di dose a 7.2 mg/kg, 8.6 mg/kg e 10 mg/kg, somministrate ogni tre settimane, hanno ciascuna arruolato circa 20 pazienti come previsto. L'azienda ha riportato un singolo evento di insufficienza renale acuta correlata al trattamento di grado 5 in un paziente con una storia clinica complessa, incluso un rene solitario; l'evento è stato ritenuto secondario a nausea, vomito e diarrea ed è stato notificato alla FDA il 18 luglio 2025. Il Safety Review Committee dello studio si è riunito il 14 luglio 2025 e ha sostenuto la prosecuzione dello studio e dell'arruolamento.

Lo studio CTMX-2051-101 è ancora in corso e un aggiornamento dei dati di Fase 1 è previsto entro il primo trimestre 2026. Il documento di deposito rende note le informazioni sull'arruolamento, l'evento avverso grave e la segnalazione regolatoria ma non fornisce ulteriori dati sull'efficacia o sulla sicurezza più ampia.

El 13 de agosto de 2025 CytomX Therapeutics ofreció una actualización sobre su estudio de Fase 1 CX-2051. Las expansiones de dosis de 7.2 mg/kg, 8.6 mg/kg y 10 mg/kg, administradas cada tres semanas, han inscrito cada una aproximadamente a 20 pacientes según lo previsto. La compañía informó un único evento de lesión renal aguda relacionada con el tratamiento de grado 5 en un paciente con antecedentes médicos complejos, incluido un riñón solitario; se consideró que el evento fue secundario a náuseas, vómitos y diarrea y se notificó a la FDA el 18 de julio de 2025. El Safety Review Committee del estudio se reunió el 14 de julio de 2025 y apoyó la continuidad de la ejecución del estudio y del reclutamiento.

El estudio CTMX-2051-101 sigue en curso y se espera una actualización de datos de Fase 1 para el primer trimestre de 2026. La presentación divulga el progreso del reclutamiento, el evento adverso grave y la notificación regulatoria, pero no aporta datos adicionales sobre eficacia ni sobre seguridad más amplia.

2025년 8월 13일 CytomX Therapeutics는 CX-2051 1상 연구에 대한 업데이트를 제공했습니다. 3주마다 투여되는 7.2 mg/kg, 8.6 mg/kg, 10 mg/kg 용량 확장군은 각각 계획대로 약 20명의 환자를 등록했습니다. 회사는 복잡한 병력을 가진 환자(단신 신장 포함)에서 단일 Grade 5 치료 관련 급성 신손상을 보고했으며, 해당 사건은 메스꺼움, 구토 및 설사에 2차적으로 발생한 것으로 판단되어 2025년 7월 18일 FDA에 보고되었습니다. 연구 안전성 심사위원회는 2025년 7월 14일 회의를 열어 연구 진행 및 등록 지속을 지지했습니다.

CTMX-2051-101 연구는 계속 진행 중이며 1상 데이터 업데이트는 2026년 1분기까지 예정됩니다. 공시에는 등록 진행 상황, 중대한 이상사례 및 규제 보고에 관한 내용이 포함되어 있으나 추가적인 효능 데이터나 광범위한 안전성 데이터는 제공하지 않습니다.

Le 13 août 2025, CytomX Therapeutics a communiqué une mise à jour sur son étude de Phase 1 CX-2051. Les extensions de dose à 7,2 mg/kg, 8,6 mg/kg et 10 mg/kg, administrées toutes les trois semaines, ont chacune enrôlé environ 20 patients comme prévu. La société a rapporté un unique événement d'insuffisance rénale aiguë de grade 5 lié au traitement chez un patient présentant des antécédents médicaux complexes, dont un rein solitaire ; l'événement a été considéré comme secondaire à des nausées, vomissements et diarrhée et a été signalé à la FDA le 18 juillet 2025. Le comité de revue de sécurité de l'étude s'est réuni le 14 juillet 2025 et a soutenu la poursuite de l'étude et de l'enrôlement.

L'étude CTMX-2051-101 est toujours en cours et une mise à jour des données de Phase 1 est attendue d'ici le premier trimestre 2026. Le dossier divulgue l'avancement de l'enrôlement, l'événement indésirable grave et la notification réglementaire mais ne fournit pas de données supplémentaires sur l'efficacité ni sur la sécurité à plus large échelle.

Am 13. August 2025 gab CytomX Therapeutics ein Update zur Phase‑1‑Studie CX-2051 bekannt. Die Dosis‑Erweiterungen bei 7,2 mg/kg, 8,6 mg/kg und 10 mg/kg, verabreicht alle drei Wochen, haben jeweils wie geplant etwa 20 Patienten eingeschlossen. Das Unternehmen meldete einen einzelnen Grad‑5 behandlungsbedingten akuten Nierenschaden bei einem Patienten mit komplexer Vorgeschichte, einschließlich einer Einzelniere; das Ereignis wurde als sekundär zu Übelkeit, Erbrechen und Durchfall eingestuft und am 18. Juli 2025 der FDA gemeldet. Das Safety Review Committee der Studie tagte am 14. Juli 2025 und unterstützte die Fortführung der Studie und die weitere Rekrutierung.

Die CTMX-2051-101‑Studie läuft weiterhin und ein Phase‑1‑Datenupdate wird bis zum 1. Quartal 2026 erwartet. Die Einreichung enthält Angaben zum Rekrutierungsstand, zum schwerwiegenden unerwünschten Ereignis und zur regulatorischen Meldung, liefert jedoch keine weiteren Wirksamkeits‑ oder umfassenderen Sicherheitsdaten.

Positive
  • Each dose expansion cohort (7.2 mg/kg, 8.6 mg/kg, 10 mg/kg) enrolled approximately 20 patients as planned, indicating trial enrollment targets were met
  • The Safety Review Committee convened and supported continued study execution and enrollment
  • The company has scheduled a Phase 1 data update by Q1 2026, providing a clear near-term data milestone
Negative
  • A single Grade 5 treatment-related acute kidney injury occurred, reported as treatment-related and involving a patient with a solitary kidney
  • The serious adverse event was reported to the FDA, which is a material safety disclosure for a clinical-stage program

Insights

TL;DR: A treatment-related Grade 5 event in Phase 1 is materially adverse to clinical risk profile despite cohorts meeting enrollment targets.

The filing confirms that the 7.2 mg/kg, 8.6 mg/kg and 10 mg/kg dose expansions each enrolled ~20 patients as planned, which supports trial execution. However, a Grade 5 treatment-related acute kidney injury—reported to the FDA—represents a serious safety outcome that will be central to future data interpretation. The company states the event involved a patient with a solitary kidney and was believed secondary to gastrointestinal complications, and the Safety Review Committee supported continuing enrollment. Investors should note the company has not released broader safety or efficacy metrics.

TL;DR: Regulatory process followed: event reported to FDA and independent committee authorized continuation, keeping the program on an active regulatory path.

The company reported the serious adverse event to the FDA on July 18, 2025 after becoming aware on July 11, 2025, and the CTMX-2051-101 Safety Review Committee convened on July 14, 2025 and supported continued study conduct. Those actions align with regulatory expectations for timely reporting and safety oversight. The study remains ongoing with a planned Phase 1 data update by Q1 2026, indicating regulators and the company have not imposed an enrollment hold per the disclosure.

Il 13 agosto 2025 CytomX Therapeutics ha fornito un aggiornamento sullo studio di Fase 1 CX-2051. Le espansioni di dose a 7.2 mg/kg, 8.6 mg/kg e 10 mg/kg, somministrate ogni tre settimane, hanno ciascuna arruolato circa 20 pazienti come previsto. L'azienda ha riportato un singolo evento di insufficienza renale acuta correlata al trattamento di grado 5 in un paziente con una storia clinica complessa, incluso un rene solitario; l'evento è stato ritenuto secondario a nausea, vomito e diarrea ed è stato notificato alla FDA il 18 luglio 2025. Il Safety Review Committee dello studio si è riunito il 14 luglio 2025 e ha sostenuto la prosecuzione dello studio e dell'arruolamento.

Lo studio CTMX-2051-101 è ancora in corso e un aggiornamento dei dati di Fase 1 è previsto entro il primo trimestre 2026. Il documento di deposito rende note le informazioni sull'arruolamento, l'evento avverso grave e la segnalazione regolatoria ma non fornisce ulteriori dati sull'efficacia o sulla sicurezza più ampia.

El 13 de agosto de 2025 CytomX Therapeutics ofreció una actualización sobre su estudio de Fase 1 CX-2051. Las expansiones de dosis de 7.2 mg/kg, 8.6 mg/kg y 10 mg/kg, administradas cada tres semanas, han inscrito cada una aproximadamente a 20 pacientes según lo previsto. La compañía informó un único evento de lesión renal aguda relacionada con el tratamiento de grado 5 en un paciente con antecedentes médicos complejos, incluido un riñón solitario; se consideró que el evento fue secundario a náuseas, vómitos y diarrea y se notificó a la FDA el 18 de julio de 2025. El Safety Review Committee del estudio se reunió el 14 de julio de 2025 y apoyó la continuidad de la ejecución del estudio y del reclutamiento.

El estudio CTMX-2051-101 sigue en curso y se espera una actualización de datos de Fase 1 para el primer trimestre de 2026. La presentación divulga el progreso del reclutamiento, el evento adverso grave y la notificación regulatoria, pero no aporta datos adicionales sobre eficacia ni sobre seguridad más amplia.

2025년 8월 13일 CytomX Therapeutics는 CX-2051 1상 연구에 대한 업데이트를 제공했습니다. 3주마다 투여되는 7.2 mg/kg, 8.6 mg/kg, 10 mg/kg 용량 확장군은 각각 계획대로 약 20명의 환자를 등록했습니다. 회사는 복잡한 병력을 가진 환자(단신 신장 포함)에서 단일 Grade 5 치료 관련 급성 신손상을 보고했으며, 해당 사건은 메스꺼움, 구토 및 설사에 2차적으로 발생한 것으로 판단되어 2025년 7월 18일 FDA에 보고되었습니다. 연구 안전성 심사위원회는 2025년 7월 14일 회의를 열어 연구 진행 및 등록 지속을 지지했습니다.

CTMX-2051-101 연구는 계속 진행 중이며 1상 데이터 업데이트는 2026년 1분기까지 예정됩니다. 공시에는 등록 진행 상황, 중대한 이상사례 및 규제 보고에 관한 내용이 포함되어 있으나 추가적인 효능 데이터나 광범위한 안전성 데이터는 제공하지 않습니다.

Le 13 août 2025, CytomX Therapeutics a communiqué une mise à jour sur son étude de Phase 1 CX-2051. Les extensions de dose à 7,2 mg/kg, 8,6 mg/kg et 10 mg/kg, administrées toutes les trois semaines, ont chacune enrôlé environ 20 patients comme prévu. La société a rapporté un unique événement d'insuffisance rénale aiguë de grade 5 lié au traitement chez un patient présentant des antécédents médicaux complexes, dont un rein solitaire ; l'événement a été considéré comme secondaire à des nausées, vomissements et diarrhée et a été signalé à la FDA le 18 juillet 2025. Le comité de revue de sécurité de l'étude s'est réuni le 14 juillet 2025 et a soutenu la poursuite de l'étude et de l'enrôlement.

L'étude CTMX-2051-101 est toujours en cours et une mise à jour des données de Phase 1 est attendue d'ici le premier trimestre 2026. Le dossier divulgue l'avancement de l'enrôlement, l'événement indésirable grave et la notification réglementaire mais ne fournit pas de données supplémentaires sur l'efficacité ni sur la sécurité à plus large échelle.

Am 13. August 2025 gab CytomX Therapeutics ein Update zur Phase‑1‑Studie CX-2051 bekannt. Die Dosis‑Erweiterungen bei 7,2 mg/kg, 8,6 mg/kg und 10 mg/kg, verabreicht alle drei Wochen, haben jeweils wie geplant etwa 20 Patienten eingeschlossen. Das Unternehmen meldete einen einzelnen Grad‑5 behandlungsbedingten akuten Nierenschaden bei einem Patienten mit komplexer Vorgeschichte, einschließlich einer Einzelniere; das Ereignis wurde als sekundär zu Übelkeit, Erbrechen und Durchfall eingestuft und am 18. Juli 2025 der FDA gemeldet. Das Safety Review Committee der Studie tagte am 14. Juli 2025 und unterstützte die Fortführung der Studie und die weitere Rekrutierung.

Die CTMX-2051-101‑Studie läuft weiterhin und ein Phase‑1‑Datenupdate wird bis zum 1. Quartal 2026 erwartet. Die Einreichung enthält Angaben zum Rekrutierungsstand, zum schwerwiegenden unerwünschten Ereignis und zur regulatorischen Meldung, liefert jedoch keine weiteren Wirksamkeits‑ oder umfassenderen Sicherheitsdaten.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

 

 

FORM 8-K

 

 

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 13, 2025

 

 

CytomX Therapeutics, Inc.

(Exact name of Registrant as Specified in Its Charter)

 

 

 

Delaware   001-37587   27-3521219
(State or Other Jurisdiction
of Incorporation)
 

(Commission

File Number)

 

(IRS Employer

Identification No.)

 

151 Oyster Point Blvd  
Suite 400  
South San Francisco, California   94080
(Address of Principal Executive Offices)   (Zip Code)

Registrant’s Telephone Number, Including Area Code: 650 515-3185

(Former Name or Former Address, if Changed Since Last Report)

 

 

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

 

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

 

Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

 

Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

 

Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

 

Title of each class

 

Trading

Symbol(s)

 

Name of each exchange

on which registered

Common Stock, $0.00001 par value per share   CTMX   Nasdaq Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

 

 
 


Item 8.01.

Other Events.

On August 13, 2025, CytomX Therapeutics, Inc. (the “Company”) announced an update on the CX-2051 Phase 1 study. The CX-2051 dose expansions at 7.2 mg/kg, 8.6 mg/kg, and 10 mg/kg doses, administered every three weeks, have each enrolled approximately 20 patients as planned. A single Grade 5 treatment-related acute kidney injury occurred in a patient with a complex medical history, including having a solitary kidney. The Grade 5 event was believed to be secondary to nausea, vomiting and diarrhea. The Company was made aware of the event on July 11, 2025 and promptly reported the event to the FDA on July 18, 2025 in accordance with regulatory requirements. The CTMX-2051-101 Safety Review Committee convened on July 14, 2025 and supported continued study execution and enrollment. The CTMX-2051-101 study is ongoing, with a Phase 1 data update expected by Q1 2026.

Forward-Looking Statements

This report includes forward-looking statements. Such forward-looking statements involve known and unknown risks, uncertainties and other important factors that are difficult to predict, may be beyond the Company’s control, and may cause the actual results, performance, or achievements to be materially different from any future results, performance or achievements expressed or implied in such statements. Accordingly, you should not rely on any of these forward-looking statements, including those relating to the ongoing clinical trial of CX-2051 and the timing of data availability for the Company’s clinical trial of CX-2051. Risks and uncertainties that contribute to the uncertain nature of the forward-looking statements include: the unproven nature of the Company’s novel PROBODY® therapeutic technology; uncertainties around the Company’s ability to raise sufficient funds to carry out its planned research and development; Company’s clinical trial product candidates are in the initial stages of clinical development and its other product candidates are currently in preclinical development, and the process by which preclinical and clinical development could potentially lead to an approved product is long and subject to significant risks and uncertainties, including the possibility that the results of preclinical research and early clinical trials, including initial CX-2051 results, may not be predictive of future results; the possibility that the Company’s clinical trials will not be successful; the possibility that current preclinical research may not result in additional product candidates; the Company’s dependence on the success of CX-2051; the Company’s reliance on third parties for the manufacture of the Company’s product candidates; possible regulatory developments in the United States and foreign countries, including China and the European Union; and the risk that the Company may incur higher costs than expected for research and development or unexpected costs and expenses. Additional applicable risks and uncertainties include those relating to the Company’s preclinical research and development, clinical development, and other risks identified under the heading “Risk Factors” included in the Company’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 7, 2025. The forward-looking statements contained in this report are based on information currently available to the Company and speak only as of the date on which they are made. The Company does not undertake and specifically disclaims any obligation to update any forward-looking statements, whether as a result of any new information, future events, changed circumstances or otherwise.


SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

 

      CYTOMX THERAPEUTICS, INC.
Date: August 13, 2025     By:  

/s/ Christopher W. Ogden

      Christopher W. Ogden
      SVP, Chief Financial Officer

FAQ

What did CytomX (CTMX) announce in the 8-K?

The company provided an update on the CX-2051 Phase 1 study: dose expansions at 7.2, 8.6 and 10 mg/kg each enrolled ~20 patients, a Grade 5 treatment-related acute kidney injury occurred and was reported to the FDA, the Safety Review Committee supported continuation, and a Phase 1 data update is expected by Q1 2026.

How many patients were enrolled in each CX-2051 dose expansion cohort?

Each of the 7.2 mg/kg, 8.6 mg/kg, and 10 mg/kg dose expansion cohorts enrolled approximately 20 patients.

What was the serious adverse event reported for CX-2051?

A single Grade 5 treatment-related acute kidney injury occurred in a patient with a complex medical history including a solitary kidney; the event was believed to be secondary to nausea, vomiting and diarrhea.

Was the event reported to regulators and did the trial continue?

Yes. The company reported the event to the FDA on July 18, 2025, the Safety Review Committee convened on July 14, 2025 and supported continued study execution and enrollment.

When will CytomX provide additional CX-2051 data?

The company expects a Phase 1 data update by Q1 2026.
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