Tarlatamab vs Standard of Care Chemotherapy in Patients With Pre-treated Advanced, Pulmonary or Gastroenteropancreatic Poorly Differentiated Neuroendocrine Carcinomas (NECs) (TARLANEC)

A GCO Trial Exploring the Efficacy and Safety of Tarlatamab Versus Investigator-choice Chemotherapy in Pre-treated Patients With Advanced, Pulmonary or Gastroenteropancreatic Poorly Differentiated Neuroendocrine Carcinomas (NECs)

Based on the efficacy of tarlatamab in patients with small-cell lung cancer, we aim to assess the efficacy of tarlatamab in patients with Advanced, pulmonary (large-cell only) or gastroenteropancreatic neuroendocrine carcinoma.

Study Overview

• Status: Recruiting
• Conditions: Neuroendocrine Carcinoma
• Intervention / Treatment: Drug: Standard of Care Chemotherapy; Drug: Tarlatamab

• Study Type: Interventional
• Enrollment (Estimated): 129
• Phase: Phase 3

Contacts and Locations

• Study Contact: Name: Contact IFCT; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr

Study Locations

• France
  • Angers, France
    • Recruiting
    • Angers - CHU
    • Contact: Guillaume ROQUIN; Phone Number: +33156811045; Email: contact@ifct.fr
    • Principal Investigator: Guillaume ROQUIN
  • Avignon, France
    • Recruiting
    • Avignon - CH
    • Contact: Malek ZOGHLAMI; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Malek ZOGHLAMI
  • Besançon, France
    • Recruiting
    • Besançon - CHU
    • Contact: Hamadi ALMOTLAK; Phone Number: +331.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Hamadi ALMOTLAK
  • Boulogne, France
    • Recruiting
    • Boulogne - Ambroise Paré
    • Principal Investigator: Etienne Giroux Leprieur
    • Contact: Etienne GIROUX LEPRIEUR
  • Caen, France
    • Recruiting
    • Caen - CHU
    • Principal Investigator: Karine BOUHIER-LEPORRIER
    • Contact: Karine BOUHIER-LEPORRIER; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
  • Chambray-lès-Tours, France
    • Recruiting
    • Tours - CHU
    • Contact: Morgane CAULET; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Morgane CAULET
  • Dijon, France
    • Recruiting
    • Dijon - CHU Bocage
    • Principal Investigator: Côme LEPAGE
    • Contact: Côme LEPAGE; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
  • Dijon, France
    • Recruiting
    • Dijon - Centre Georges-Francois Leclerc
    • Contact: François GHIRINGHELI; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: François GHIRINGHELI
  • Grenoble, France
    • Recruiting
    • Grenoble - CHU
    • Principal Investigator: Denis Moro-Sibilot
    • Contact: Denis MORO-SIBILOT; Phone Number: 33 1.56.81.10.45; Email: contact@ifct.fr
  • Le Mans, France
    • Recruiting
    • Le Mans - CHG
    • Contact: Camille GUGUEN; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Camille GUGUEN
  • Lille, France
    • Recruiting
    • Lille - Centre Oscar Lambret
    • Contact: Elisabeth GAYE; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Elisabeth GAYE
  • Limoges, France
    • Recruiting
    • Limoges - CHU
    • Contact: rédéric THUILLIER; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: rédéric THUILLIER
  • Lyon, France
    • Recruiting
    • Lyon - Centre Léon Bérard
    • Contact: Aurélie SWALDUZ; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Aurélie SWALDUZ
  • Lyon, France
    • Recruiting
    • Lyon - Hôpital Edouard Herriot
    • Principal Investigator: Thomas WALTER
    • Contact: Thomas WALTER; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
  • Lyon, France
    • Recruiting
    • Lyon - Hôpital Privé Jean Mermoz
    • Principal Investigator: Jérôme DESRAME
    • Contact: Jérôme DESRAME; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
  • Marseille, France
    • Recruiting
    • Marseille - APHM
    • Principal Investigator: Laurent GREILLIER
    • Contact: Laurent GREILLIER; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
  • Marseille, France
    • Recruiting
    • Marseille - Institut Paoli-Calmettes
    • Contact: Patricia NICCOLI; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Patricia NICCOLI
  • Montpellier, France
    • Recruiting
    • Montpellier - CHU
    • Contact: Patricia BARRE; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Patricia BARRE
  • Nice, France
    • Recruiting
    • Nice - Centre Antoine Lacassagne
    • Contact: Claire JARAUDIAS; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Claire JARAUDIAS
  • Paris, France
    • Recruiting
    • Paris - Curie
    • Principal Investigator: nicolas girard
    • Contact: Nicolas GIRARD
  • Paris, France
    • Recruiting
    • Paris - Hôpital Cochin
    • Contact: Anne PELLAT; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Anne PELLAT
  • Paris, France
    • Recruiting
    • Paris - Tenon
    • Contact: Anthony CANELLAS; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Anthony CANELLAS
  • Paris, France
    • Recruiting
    • Paris - Saint-Antoine
    • Contact: Pauline AFCHAIN; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Pauline AFCHAIN
  • Pessac, France
    • Recruiting
    • Bordeaux - CHU
    • Contact: Maéva ZYSMAN; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: MAEVA ZYSMAN
  • Pierre-Bénite, France
    • Recruiting
    • Lyon - HCL
    • Contact: Sébastien COURAUD; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Sébastien COURAUD
  • Poitiers, France
    • Recruiting
    • Poitiers - CHU
    • Contact: Aurélie FERRU; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Aurélie FERRU
  • Reims, France
    • Recruiting
    • Reims - CHU
    • Contact: Maxime DEWOLF; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Maxime DEWOLF
  • Rennes, France
    • Recruiting
    • Rennes - CHU
    • Principal Investigator: Charles RICORDEL
    • Contact: Charles RICORDEL; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
  • Rouen, France
    • Recruiting
    • Rouen - CHU
    • Principal Investigator: Frédéric DI FIORE
    • Contact: Frédéric DI FIORE; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
  • Saint-Herblain, France
    • Recruiting
    • Nantes - Hôpital Laennec
    • Contact: Alexandre LUGAT; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Alexandre LUGAT
  • Saint-Herblain, France
    • Recruiting
    • Nantes - Institut de Cancérologie de l'Ouest
    • Contact: Hélène SENELLART; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Hélène SENELLART
  • Strasbourg, France
    • Recruiting
    • Strasbourg - Nouvel Hôpital Civil
    • Contact: Guillaume PAMART; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Guillaume PAMART
  • Toulon, France
    • Recruiting
    • Toulon - CHI
    • Principal Investigator: Clarisse Audigier-Valette
    • Contact: Clarisse AUDIGIER-VALETTE; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
  • Toulouse, France
    • Recruiting
    • Toulouse - CHU
    • Principal Investigator: Julien Mazieres
    • Contact: Julien MAZIERES; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
  • Tours, France
    • Recruiting
    • Tours - CHU
    • Principal Investigator: Delphine CARMIER
    • Contact: Delphine CARMIER; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
  • Vandœuvre-lès-Nancy, France
    • Recruiting
    • Vandoeuvre-lès-Nancy - Institut de Cancérologie de Lorraine
    • Contact: Christelle CLEMENT-DUCHENE; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Christelle CLEMENT-DUCHENE
  • Villefranche-sur-Saône, France
    • Recruiting
    • Villefranche sur Saône - CH
    • Contact: Luc ODIER; Phone Number: +33 1.56.81.10.45; Email: contact@ifct.fr
    • Principal Investigator: Luc ODIER

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Signed Informed consent:

   • Subjects must have signed and dated an IRB/IEC approved written informed consent form in accordance with regulatory and institutional guidelines. This must be obtained before the performance of any protocol related procedures that are not part of normal subject care.
   • Subjects must be willing and able to comply with scheduled visits, treatment schedule, and laboratory testing
2. Age ≥ 18 years.
3. WHO Performance status 0 - 1.
4. Life expectancy > 12 weeks.
5. Histologically proven and centrally confirmed poorly differentiated neuroendocrine carcinoma (NEC): large cells for lung NEC (WHO 2015 classification), and large and small cells for extra-gastroenteropancreatic (assessed on archived tissue, with possible pre-screening during first-line).
6. Expression of DLL3 in at least 1% of tumor cells (assessed on archived tissue, with possible pre-screening during first-line)
7. Tumor progression following one platinum based line of therapy.
8. Unresectable locally advanced or metastatic stage.
9. At least one measurable target lesion according to RECIST v1.1 per investigator assessment. The radiological assessment has to be done within the timelines indicated.
10. Adequate organ function: creatinine clearance > 50 mL/min, Neutrophils count ≥ 1500/mm3; Platelets > 100 000/mm3 ; Hemoglobin > 9 g/dL; AST and ALT < 3 x ULN (upper limit of normal) with total bilirubin ≤ 2 × ULN except subjects with documented Gilbert's syndrome or liver metastasis, who must have AST and ALT ≤ 5 x ULN and a baseline total bilirubin ≤ 3.0 mg/dL.
11. Full recovery from all toxicities associated with prior treatment, to acceptable baseline status, or a National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE v5.0) grade of 0 or 1, except for toxicities not considered a safety risk, such as alopecia or vitiligo.
12. Availability of tumor material for central review processes and translational research projects.
13. Absence of any unstable systemic disease and any psychological, familial, sociological or geographical factors potentially hampering compliance with the study protocol and follow-up schedule.
14. Females of childbearing potential who are sexually active with a non-sterilized male partner must use a highly effective method of contraception for 28 days prior to the first dose of investigational product, and must agree to continue using such precautions for 7 months after the final dose of investigational product; cessation of contraception after this point should be discussed with a responsible physician. Periodic abstinence, the rhythm method, and the withdrawal method are not acceptable methods of contraception. They must also refrain from egg cell donation for 7 months after the final dose of investigational product.
15. Men who are sexually active with women of childbearing potential will be instructed to adhere to contraception for a period of 6 months after the last dose of treatment.
16. Patient covered by a national health insurance.

Exclusion Criteria:

1. Well-differentiated neuroendocrine tumor (NET G1, G2 and G3 according to digestive WHO 2017 classification or typical/atypical carcinoid tumor according to lung WHO 2015 classification)
2. Previous treatment targeting DLL3
3. More than one line of systemic therapy in the metastatic setting. Chemotherapy for non-metastatic stage is not considered as first-line if there is a time interval of at least 6 months between the last dose of chemotherapy for non-metastatic stage and the initiation of first-line chemotherapy for metastatic/recurrent disease.
4. Small cell lung NEC (except as a minor <30% component in mixed tumors)
5. Known EGFR activating mutation or ALK or ROS1 rearrangement for lung NEC

6. Untreated or symptomatic central nervous system (CNS) metastases:

   • Subjects with asymptomatic CNS metastases are eligible if clinically stable for at least 4 weeks and do not require intervention (including use of corticosteroids).

   • Subjects with treated brain metastases are eligible provided the following criteria are met:

     • Subject is asymptomatic from brain metastases
     • Whole brain radiation or surgery was completed at least 2 weeks prior to first dose of study treatment (stereotactic radiosurgery completed at least 7 days prior to first dose of study treatment)
     • Any CNS disease is clinically stable, subject is off steroids for CNS disease for at least 5 days (unless steroids are indicated for a reason unrelated to CNS disease), and subject is off or on stable doses of anti-epileptic drugs at least 14 days prior to first dose of study treatment
7. Leptomeningeal metastasis
8. Patients with a recent history of other malignancies except adequately treated non-melanoma skin cancer, and curatively treated in-situ cancer. Patients with history of solid tumors, including adenocarcinoma, treated in a curative way with or without chemotherapy and without any evidence of disease >2 years before randomisation can be included as well.
9. Major surgery within 28 days prior to initiation of study treatment.
10. Myocardial infarction and/or symptomatic congestive heart failure (New York Head Association class > class II) within 12 months prior to initiation of study treatment.
11. History of arterial thrombosis (e.g. stroke or transient ischemic attack) within 12 months prior to initiation of study treatment.
12. Symptoms and/or clinical and/or radiological signs suggestive of uncontrolled and/or acute active systemic infection within 7 days prior to first administration ofstudy treatment. Patient with active infection requiring parenteral antibiotic therapy. Upon completion of parental antibiotic therapy and resolution of symptoms, the patient may be considered eligible under the infection criterion.
13. Known sensitivity and/or immediate hypersensitivity to any component of study treatment.
14. History of primary immunodeficiency, history of organ transplant that requires therapeutic immunosuppression and the use of immunosuppressive agents within 28 days of randomization or a prior history of severe (grade 3 or 4) immune mediated toxicity from other immune therapy.
15. Patients with immune pneumonitis, pituitary or thyroid disorders, or pancreatitis under treatment with immuno-oncology agents.
16. Patients reporting infusion-related reactions or severe, life-threatening or recurrent immune-mediated adverse events (grade 2 or higher), including events leading to permanent discontinuation of immuno-oncology agents.
17. Presence of an indwelling line or drain (including the following: percutaneous nephrostomy tube, indwelling Foley catheter, biliary drain, peritoneal drain or catheter, pericardial drain or catheter, drain catheter or thoracic drain for pleural fluid collection).
18. Patient with a diagnosis of immunodeficiency or undergoing systemic corticotherapy or any other form of immunosuppressive therapy within 7 days prior to administration of the first dose of study treatment.
19. Known acute or chronic B or C hepatitis by serological evaluation. Patients with serological sequellae of hepatitis (antibodies test serologically positive for virus) without hepatitis could be included.
20. Known Human immunodeficiency virus infection
21. Patients who are pregnant or breast-feeding, or planning to become pregnant or breast-feed during the trial and within 7 months after the last dose of study treatment.
22. Male not wishing to abstain from sperm donation during the trial and within 6 months of the last study treatment.
23. Vaccination with live or attenuated virus vaccines is not permitted during the 28 days prior to administration of the first dose of treatment, and for the duration of the study. Vaccination against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) should be avoided during selection, at least 14 days before the first day of treatment. Live, non-replicating smallpox vaccines (such as Jynneos) against monkeypox infection are permitted during the study (except during cycle 1) in accordance with the center's standard of care and internal recommendations.
24. Active autoimmune disease requiring systemic therapy (except replacement therapy) within the last 2 years or any other disease requiring immunosuppressive therapy during the study.
25. Patients with other concurrent severe and/or uncontrolled medical disease which could compromise participation in the study.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: Arm A : Standard of care chemotherapy; Study treatment in the arm A is left to the investigator appreciations. This may include immune checkpoint inhibitors, docetaxel, topotecan for primary lung tumors, and FOLFOX, FOLFIRI or alkylating-based chemotherapy in primary digestive tumors.	Drug: Standard of Care Chemotherapy; Study treatment in the arm A is left to the investigator appreciations. This may include immune checkpoint inhibitors, docetaxel, topotecan for primary lung tumors, and FOLFOX, FOLFIRI or alkylating-based chemotherapy in primary digestive tumors.
Experimental: Arm B : Tarlatamab; Tarlatamab 10 mg every 2 weeks	Drug: Tarlatamab; Tarlatamab 10 mg every 2 weeks

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Overall survival (OS) in patients who received at least one dose of treatment.	Time from date of inclusion to the date of death due to any cause. Time from date of inclusion to the date of death due to any cause. Time from date of inclusion to the date of death due to any cause.	About 4 years

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Safety and tolerability of cemiplimab	Incidence, nature, and severity of treatment-related adverse events/treatment-emergent adverse events, graded according to the National Cancer Institute Common Terminology Criteria for Adverse Events, Version 5.0 (NCI CTCAE v5.0)except CRS and ICANS events graded using ASTCT 2019	About 4 years
Objective Response Rate (ORR)	Proportion of patients who have achieved a best overall response of complete response (CR) or partial response (PR) or stable disease (SD)	About 4 years
Duration of Response (DoR)	Time from the date of the first response (CR or PR) to the earliest date of disease progression	About 4 years
Disease Control Rate (DCR)	Proportion of patients who have achieved a best overall response of complete response (CR) or partial response (PR) or stable disease (SD)	About 4 years
Progression-Free Survival (PFS)	Time from randomization to progression or death.	About 4 years
Overall survival (OS)	Time from date of inclusion to the date of death due to any cause.	About 4 years
To evaluate the quality of life of patients with questionnaire EORTC Quality of Life Questionnaire - Core C30 (QLQ-C30)	Time to symptom deterioration will be defined as the time from ranodmization until the date of first symptom deterioration. The European Organisation for Research and Treatment of Cancer (EORTC) Quality of Life Questionnaire - Core Questionnaire C30 (EORTC QLQ-C30) is a 30 item instrument meant to assess some of the different aspects that define the quality of life of cancer patients. Scale : Not at all / A little / Quite a bit / Very much	About 4 years

Collaborators and Investigators

• Sponsor: Intergroupe Francophone de Cancerologie Thoracique

Study record dates

Study Major Dates

• Study Start (Actual): February 6, 2026
• Primary Completion (Estimated): February 1, 2029
• Study Completion (Estimated): August 1, 2030

Study Registration Dates

• First Submitted: April 14, 2025
• First Submitted That Met QC Criteria: April 14, 2025
• First Posted (Actual): April 22, 2025

Study Record Updates

• Last Update Posted (Actual): February 11, 2026
• Last Update Submitted That Met QC Criteria: February 9, 2026
• Last Verified: February 1, 2026

More Information

Terms related to this study

• Keywords: IFCT; GERCOR; FFCD; Neuroendocrine Carcinoma of Lung (Large cells); Gastroenteropancreatic Neuroendocrine Carcinoma; GCO
• Additional Relevant MeSH Terms: Neoplasms; Neoplasms by Histologic Type; Neoplasms, Glandular and Epithelial; Adenocarcinoma; Carcinoma; Neuroectodermal Tumors; Neoplasms, Germ Cell and Embryonal; Neoplasms, Nerve Tissue; Neuroendocrine Tumors; Carcinoma, Neuroendocrine
• Other Study ID Numbers: GCO-003

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: UNDECIDED

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No