Tumours, GynecologicalPhase 1/2NCT06796907
A Study of Mocertatug Rezetecan in Combination With Anti-cancer Therapies for Advanced Solid Tumors (BEHOLD-2)
A Phase 1/2 study testing Mo-Rez, Dostarlimab and Bevacizumab in people with Tumours, Gynecological, run by GlaxoSmithKline at 82 sites in 23 countries.
Trial summary
Advanced solid tumors are cancers that have spread to other parts of the body. While many treatments exist, most people become resistant to them, and the cancer returns. Researchers are developing new treatments that combine different medicines for those who do not respond to single medicine. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Tumours, Gynecological
- What is being tested?
- Mo-Rez, Dostarlimab and Bevacizumab
- Type of treatment
- Injection or infusion
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 305 participants
- Where
- 82 sitesin 23 countries
- Study dates
- 4 Mar 2025to 10 Oct 2028
- Phase
- Phase 1/2
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Participants must be 18 years of age inclusive or older, at the time of signing the informed consent, or the legal age of consent in the jurisdiction in which the study is taking place.
- Participant capable of giving signed informed consent including compliance with the requirements and restrictions listed in the Informed consent form (ICF) and in this protocol.
- Participants with pathologically confirmed advanced solid tumor specific for study Module (key local diagnostic molecular and/or immunophenotyping testing results/tumor cell phenotype results for confirmed diagnosis should be provided) with no more than 4 lines of prior systemic therapies. Please note:
- Adjuvant +/- neoadjuvant considered one line of therapy
- Maintenance therapy will be considered as part of the preceding line of therapy (i.e., not counted independently)
- Unplanned addition or switching to a new drug in a different class is considered a separate line of therapy. If an agent in a regimen is switched to another agent in the same class due to toxicity or intolerance (e.g. hypersensitivity reaction) this is considered part of the same line (i.e. not counted independently).
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- Requirements for tumor tissue samples: Archival or fresh tumor tissue is required for retrospective central assessment of B7H4 expression by immunohistochemistry (IHC) and other biomarker analysis. The archival tumor tissue should be from the most recent procedure (ideally obtained after the last anti-cancer treatment). If an archival tissue is not available a new biopsy should be performed, and the newly obtained tissue provided.
- Participants have at least one target lesion as assessed per RECIST 1.1. A target lesion is defined as a measurable lesion that has not undergone locoregional treatment such as irradiation or that has unequivocal progression following locoregional treatment, with the longest diameter of ≥ 10 millimeter (mm) at Baseline (for lymph node lesions, the short axis should be ≥ 15 mm).
- Participants have a life expectancy of at least 12 weeks per investigator assessment based on disease burden and extent of supportive care needed.
- Inclusion criteria of participants under arm Module 1 (Mo-Rez +Dostarlimab) Endometrial Cancer Part 1A:
- Participants with histologically documented, advanced (metastatic and/or unresectable) or recurrent endometrial cancer who have failed in adequate standard treatments, do not have effective standard treatment or are intolerant to standard of care, and who are not candidates for further curative external radiotherapy or brachytherapy.
- Inclusion criteria of participants under arm Module 1 (Mo-Rez +Dostarlimab) Endometrial Cancer Part 1B:
- Diagnosis of endometrial cancer with confirmed mismatch repair proficient (MMRp) or microsatellites stable (MSS) tumor status by local test.
- Participants who have progressed on or are intolerant to at least 1 line of standard prior systemic therapy (including neoadjuvant or adjuvant as prior line), and who are not candidates for curative external radiotherapy or brachytherapy. Maintenance therapy will be considered part of the preceding line of therapy (i.e, not counted independently).
- Inclusion criteria of participants under arm Module 2 (Mo-Rez +/- Bevacizumab) Ovarian Cancer Part 2A:
- Participants with histologically or cytologically confirmed advanced epithelial ovarian cancer/fallopian tube/peritoneal cancer (any epithelial histology - mucinous, clear cell, carcinosarcoma, high/low grade serous, endometrioid) who have failed in adequate standard treatments, do not have effective standard treatment or are intolerant to standard of care.
- Inclusion criteria of participants under arm Module 2 (GSK5733584 +/- Bevacizumab) Ovarian Cancer Part 2B:
- Participants whose advanced ovarian cancer/fallopian tube/peritoneal cancer has relapsed more than 6 months from the last dose of platinum before enrollment, i.e., platinum sensitive.
- Participants who have progressed on or are intolerant to at least 1 line of standard prior lines of chemotherapy and are not candidates for second cytoreductive surgery.
- Participants willing to use adequate contraception.
- Female participants:
- A female participant is eligible to participate if she is not pregnant or breastfeeding, and one of the following conditions applies:
- Is a Woman of non-childbearing potential (WONCBP) OR
- Is a Woman of childbearing potential (WOCBP) and using a contraceptive method that is highly effective.
- A WOCBP must have a negative highly sensitive pregnancy test (urine or serum as required by local regulations) within 24 hours before the first dose of study intervention
- Has an ECOG performance status of 0 to 1.
- Participants with normal organ and bone marrow function.
Who cannot join
- Has a second malignancy (except disease under study) that has progressed or required active treatment within the past 24 months except for basal cell or squamous cell carcinomas of the skin or in-situ carcinomas [e.g., breast, cervix, bladder] that have been resected with no evidence of metastatic disease.
- Has had any major surgery within 28 days prior to enrolment.
- Has any history of prior allogenic or autologous bone marrow transplant or other solid organ transplant.
- Has known sensitivity to study intervention components, Mo-Rez (antibody-drug conjugate, antibody, free cytotoxin GSK5757810A) and combination partner, or its excipients or other allergy that, in the opinion of the investigator, contraindicates participation in the study.
- Has any following cardiological examination abnormality:
- history in prior year of clinically significant or uncontrolled cardiac disease, acute myocardial infarction, NYHA Class III or IV congestive heart failure or clinically significant arrhythmia not controlled by standard of care therapy.
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- Corrected QT Interval (QTcF) >450 millisecond (msec) or QTcF >480 msec for participants with bundle branch block
- Has untreated brain or CNS metastases or brain/CNS metastases rapidly progressing requiring urgent medical intervention.
- Any evidence of current interstitial lung disease (ILD) or pneumonitis or a prior history of ILD or non-infectious pneumonitis.
- Has a history of autoimmune disease that has required systemic treatments in the 2 years prior to screening (i.e., with use of disease modifying agents, corticosteroids, or immunosuppressive drugs). Replacement therapy is not considered a form of systemic therapy (e.g., thyroid hormone for autoimmune thyroiditis or insulin is not exclusionary).
- Clinically significant bleeding symptoms, significant bleeding tendency, or bleeding tumors within 1 month prior to the first dose of study treatment.
- Serious or poorly controlled hypertension, including history of hypertensive crisis, hypertensive encephalopathy; adjustment of antihypertensive medications due to poor blood pressure control within 2 weeks prior to the first dose of study treatment;
- Has any active renal condition (e.g., infection, requirement for dialysis, or any other active significant renal condition or dehydrated condition that could affect the participant's safety). Note: renal obstruction successfully managed by stenting is permitted.
- Has any serious and/or unstable medical condition (such as clinical symptoms of intestinal obstruction) or psychiatric disorder or other condition(s) (including laboratory assessment abnormalities) that could interfere with the participant's safety, obtainment of informed consent, or compliance to the study procedures.
- Participants with known history of Human immunodeficiency virus (HIV).
- Exclusion criteria of participants under arm Module 1 (Mo-Rez +Dostarlimab) Endometrial Cancer:
- Has mesenchymal tumor of the uterus (uterine sarcoma).
- Has experienced symptomatic pericarditis of any etiology within 6 months of study treatment or any of the following with prior immunotherapy: any imAE ≥ Grade 3, immune-mediated severe neurologic events of any-grade (e.g., myasthenic syndrome/myasthenia gravis, encephalitis Guillain-Barré Syndrome, or transverse myelitis), exfoliative dermatitis of any grade (SJS, TEN, or DRESS syndrome), or myocarditis of any grade.
- Exclusion criteria of participants under arm Module 2 (Mo-Rez +/-Bevacizumab) Ovarian Cancer:
- Participants with wound healing complications or incompletely healed wounds.
- Participants with history or evidence of gastrointestinal perforation, tracheoesophageal fistula, or any grade 4 fistula; participants with gastrointestinal fistula, visceral fistula, or abdominal abscess within 6 months prior to the first dose, participants with history of osteonecrosis of the jaw.
- Participants who have evidence of recto-sigmoid involvement by pelvic examination or bowel involvement on CT scan or clinical symptoms of bowel obstruction.
- Participants with congenital bleeding diathesis, acquired coagulopathy, recent pulmonary haemorrhage/ haemoptysis (> 2.5 mL of red blood or ½ teaspoon) within the last 3 months. Participants receiving treatment for thromboembolism are permitted as long as they have been on a stable dose of anticoagulation for at least 1 month.
- Participant has history of congestive heart failure (CHF) or baseline LVEF <50% or institutional lower limits of normal.
- Participant with history of nephrotic syndrome or grade 3 proteinuria. Participants has proteinuria as demonstrated by urine dipstick for proteinuria ≥2 (participants discovered to have ≥2 proteinuria on dipstick at baseline should undergo 24-hour urine collection and must demonstrate ≤1 g of protein in 24 hours to be eligible).
- Has an Alanine transaminase (ALT) value >2.5x Upper Limit of Normal (ULN) and for participants with documented liver metastases/tumor infiltration has an ALT value >5x ULN.
- Has a total bilirubin value >1.5x ULN.
- Has documented presence of HBsAg and/or HBcAb, or HBsAb (except for presence of HBsAb attributable to previous vaccination) at screening or within 3 months prior to the first dose of study intervention.
- Has a positive HCV antibody test result at screening or within 3 months prior to the first dose of study intervention.
- Has received prior therapy with topoisomerase-1 inhibitors or ADC with topoisomerase-1 inhibitor warhead, or B7H4 targeted therapy.
- Has received treatment with any cytotoxic chemotherapy drugs or other anti-tumor drugs (including endocrine therapy, molecular targeted therapy, immunotherapy, biotherapy, and investigational drug) within 30 days or 5 half-lives, whichever is shorter of a medicinal product prior to the first dose of study drug; or need to continue these drugs during the study.
- Use of inhibitors of P-gp, breast cancer resistance protein (BCRP) or OATP1B1/1B3 within 7 days prior to the first dose of study drug. P-gp inducers should be discontinued for at least 14 days before the start of the study.
- Have received locoregional radiation therapy within 2 weeks prior to the first dose of study drug; more than 30% of bone marrow irradiation or wide-field radiation therapy within 4 weeks prior to the first dose of study treatment.
- Has serious infections within 4 weeks prior to the first dose, including but not limited to infectious complications, bacteremia, severe pneumonia treated with intravenous antibiotics for ≥2 weeks.
Trial locations and contacts
82 sites in 23 countries. Contact the study team or a site near you to ask about taking part.
82 sites in 23 countries
Spain10 sites, 10 recruiting
- Recruiting
GSK Investigational Site
A Coruña, 15009
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Barcelona, 08023
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Barcelona, 08035
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Barcelona, 08036
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Madrid, 28033
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Madrid, 28041
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Madrid, 28050
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Málaga, 29010
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Valencia, 46009
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Zaragoza, 50009
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
Brazil6 sites, 6 recruiting
- Recruiting
GSK Investigational Site
Barretos, 14784-400
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Goiânia, 74605-070
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Natal, 59075-740
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Porto Alegre, 90020-090
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
São Paulo, 01246-000
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Vitória, 29043-260
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
United States5 sites, 5 recruiting
- Recruiting
GSK Investigational Site
Aurora, Colorado, 80045-2517
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Columbus, Ohio, 43210-1240
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Durham, North Carolina, 27710
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
La Jolla, California, 92093
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Rochester, New York, 55905-0001
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
France5 sites, 5 recruiting
- Recruiting
GSK Investigational Site
Lyon, 69373
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Marseille, 13273
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Montpellier, 34298
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Pierre-Bénite, 69495
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Villejuif, 94805
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
Argentina4 sites, 4 recruiting
- Recruiting
GSK Investigational Site
Buenos Aires, C1181ACH
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Buenos Aires, C1280AEB
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
CABA, C1187
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Viedma, R8500ACE
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
Belgium4 sites, 4 recruiting
- Recruiting
GSK Investigational Site
Brussels, 1200
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Ghent, 9000
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Leuven, 3000
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Liège, 4000
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
Canada4 sites, 4 recruiting
- Recruiting
GSK Investigational Site
Montreal, Quebec, H2X 0A9
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Montreal, Quebec, H4A 3J1
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Toronto, Ontario, M5G 2M9
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Vancouver, British Columbia, V5Z 4E6
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
Germany4 sites, 4 recruiting
- Recruiting
GSK Investigational Site
Cologne, 50931
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Leipzig, 04103
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Mainz, Rhineland-Palatinate, 55131
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
München, Bavaria, 81377
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
Greece4 sites, 4 recruiting
- Recruiting
GSK Investigational Site
Athens, 11528
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Athens, 12462
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Panórama, Central Macedonia, 552 36
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Pylaia Thessaloniki, 570 01
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
Italy4 sites, 4 recruiting
- Recruiting
GSK Investigational Site
Milan, MI, 20159
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Milan, 20141
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Naples, 80131
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Roma, RM, 00168
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
Japan4 sites, 4 recruiting
- Recruiting
GSK Investigational Site
Chiba, 277-8577
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Fukuoka, 811-1395
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Tokyo, 104-0045
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Tokyo, 135-8550
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
Poland4 sites, 3 recruiting
- Recruiting
GSK Investigational Site
Bialystok, 15-027
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Gliwice, 44-102
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Józefów, 05-410
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Completed
GSK Investigational Site
Warsaw, 01-748
Netherlands3 sites, 3 recruiting
- Recruiting
GSK Investigational Site
Amsterdam, 1066 CX
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Amsterdam, 1081 HV
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Rotterdam, 3015 GD
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
Panama3 sites, 3 recruiting
- Recruiting
GSK Investigational Site
Panama City
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Panama City
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Punta Pacifica Panama City Panama
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
South Korea3 sites, 3 recruiting
- Recruiting
GSK Investigational Site
Seoul, 05505
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Seoul, 120-752
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Seoul, 135-710
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
Turkey (Türkiye)3 sites, 3 recruiting
- Recruiting
GSK Investigational Site
Ankara, 06590
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Ankara, 6170
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Istanbul, 34010
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
Australia2 sites, 2 recruiting
- Recruiting
GSK Investigational Site
Liverpool, New South Wales, 2170
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Wollongong, New South Wales, 2500
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
Denmark2 sites, 2 recruiting
- Recruiting
GSK Investigational Site
Herlev
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
København Ø, Capital Region, 2100
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
Finland2 sites, 2 recruiting
- Recruiting
GSK Investigational Site
Helsinki, 00029
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
Tampere, 33520
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
Mexico2 sites, 2 recruiting
- Recruiting
GSK Investigational Site
Mexico City, 14080
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
- Recruiting
GSK Investigational Site
San Pedro Garza García, Nuevo León, 66260
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
United Kingdom2 sites
- Withdrawn
GSK Investigational Site
Glasgow, G12 0YN
- Completed
GSK Investigational Site
London, NW1 2BU
Norway1 site, 1 recruiting
- Recruiting
GSK Investigational Site
Oslo, 0379
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
Sweden1 site, 1 recruiting
- Recruiting
GSK Investigational Site
Stockholm, 17164
US GSK Clinical Trials Call Center, 877-379-3718, GSKClinicalSupportHD@gsk.com
EU GSK Clinical Trials Call Centre, +44 (0) 20 8990 4466, GSKClinicalSupportHD@gsk.com
About this study
Official title: A Phase 1/2 Randomized Multi-Cohort Study to Evaluate the Safety, Tolerability, Pharmacokinetics and Clinical Activity of Mocertatug Rezetecan in Combination With Anti-Cancer Agents in Participants With Advanced Solid Tumors
Advanced solid tumors are cancers that have spread to other parts of the body. While many treatments exist, most people become resistant to them, and the cancer returns. Researchers are developing new treatments that combine different medicines for those who do not respond to single medicine. This study is looking at how safe and tolerable Mocertatug Rezetecan (Mo-Rez) is, how the body handles it, and how well it works when used with other cancer medicines. The study will include participants with advanced solid tumors who have either not responded to standard treatments or cannot tolerate them or have no available effective treatment.
- Conditions
- Tumours, Gynecological
- Being tested
- Mo-Rez, Dostarlimab, Bevacizumab
- Keywords
- Solid Tumors, Mocertatug Rezetecan, Mo-Rez, GSK5733584, BEHOLD-2
- Medical subject headings
- Neoplasms
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Mo-RezDrug
Mo-Rez will be administered intravenously (IV).
DostarlimabDrug
Dostarlimab will be administered IV.
BevacizumabDrug
Bevacizumab will be administered IV.
| Study group | Role | What they receive |
|---|---|---|
| Module 1 (Mo-Rez +Dostarlimab) Endometrial Cancer | Experimental | Not described Receives: Drug: Mo-Rez; Drug: Dostarlimab |
| Module 2 (Mo-Rez +/-Bevacizumab) Ovarian Cancer | Experimental | Not described Receives: Drug: Mo-Rez; Drug: Bevacizumab |
What is being measured
The primary outcome is the main question the study is designed to answer.
Part A: Percentage of participants with dose limiting toxicities (DLTs)
Measured: Approximately 7 months
Part A: Number of participants with adverse events (AEs), immune-mediated adverse events (imAEs), adverse events of special interest (AESI), serious adverse events (SAEs) by Severity
Measured: Up to approximately 22 months
Part A: Number of participants with adverse events (AEs), immune-mediated adverse events (imAEs), adverse events of special interest (AESI), serious adverse events (SAEs) by Frequency
Measured: Up to approximately 22 months
Part B: Confirmed Objective Response Rate (ORR)
ORR is defined as the percentage of participants with a best overall confirmed (BOR) of Partial Response (PR) or better per Response Evaluation Criteria in Solid Tumors (RECIST 1.1)
Measured: Up to approximately 37 months
Secondary outcomes (16)
Part A: Confirmed Objective Response Rate (ORR)
ORR is defined as the percentage of participants with a best overall confirmed (BOR) of Partial Response (PR) or better per Response Evaluation Criteria in Solid Tumors (RECIST 1.1)
Measured: Up to approximately 22 months
Parts A and B: Duration of response (DoR)
DoR is defined as the time from date of first documented evidence of PR or better to the date of disease progression or death due to any cause.
Measured: Up to approximately 37 months
Parts A and B: Progression-free survival (PFS)
PFS is defined as time from the date of randomization (Part B) / first dose of study intervention (Part A or B if single arm) to the date of disease progression according to investigator assessment or death due to any cause, whichever occurs first.
Measured: Up to approximately 37 months
Part B: Overall Survival (OS)
OS is defined as the time from randomization (or date of first dose if single arm) to the date of death due to any cause.
Measured: Up to approximately 37 months
Part B: Proportion of participants with CA-125 response
Measured: Up to approximately 37 months
Parts A and B: Maximum observed concentration (Cmax) of Mo-Rez
Measured: Up to approximately 37 months
Parts A and B: Time to reach Cmax (tmax) of Mo-Rez
Measured: Up to approximately 37 months
Parts A and B: Trough concentration (Ctrough) of Mo-Rez
Measured: Up to approximately 37 months
Parts A and B: Area under the concentration-time curve (AUC) of Mo-Rez
Measured: Up to approximately 37 months
Parts A and B: Number of participants with Anti-drug antibodies (ADA)
Measured: Up to approximately 37 months
Parts A and B: Number of participants with neutralizing antibody (nAb)
Measured: Up to approximately 37 months
Parts A and B: Titers of ADA to Mo-Rez
Measured: Up to approximately 37 months
Parts A and B: Number of Participants with Clinically Significant Changes in Vital Signs, Laboratory parameters, and Electrocardiogram (ECG)
Measured: Up to approximately 37 months
Part B: Number of participants with adverse events (AEs), immune-mediated adverse events (imAEs), adverse events of special interest (AESI), serious adverse events (SAEs) by Frequency
Measured: Up to approximately 37 months
Part B: Number of participants with adverse events (AEs), immune-mediated adverse events (imAEs), adverse events of special interest (AESI), serious adverse events (SAEs) by Severity
Measured: Up to approximately 37 months
Parts A and B: Change from Baseline in Eastern Cooperative Oncology Group Performance Scale (ECOG PS) score
ECOG PS is used for measuring how the disease impacts a participant's daily living abilities. The grades for the scale range from 0 (fully active) to 5 (dead), with increasing severity.
Measured: Baseline and up to approximately 37 months
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted28 Jan 2025
- Study start4 Mar 2025
- Primary completion21 Jun 2027 (estimated)
- Study completion10 Oct 2028 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Tumours, GynecologicalStudies of the same condition, open and under way.
- More trials run by GlaxoSmithKlineThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 1/2
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 305 participants (estimated)
Sponsor and investigators
- Lead sponsor
- GlaxoSmithKline
- Sponsor type
- Industry (pharma, biotech, devices)
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06796907
- Sponsor's protocol ID
- 223559
- Other IDs
- 2024-517147-31-00
- Status last verified
- Sep 2026
- First submitted
- 22 Jan 2025
- Last updated
- 2 Oct 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
- Individual data sharing
- Yes: Study Sponsor will assess requests from qualified researchers for anonymized individual patient-level data and related study documents. Data sharing is subject to certain criteria, conditions, and exceptions. For further information, refer to https://www.gsk-studyregister.com/gsk-patient-level-data-sharing-july2025.pdf
Publications
Lheureux S, Provencher D, Baka S, Kowalyszyn R, Schutte T, Urun Y, Zeng X, Oaknin A, Lorusso D, Ray-Coquard I, Moreno V, Jalkanen K, Liu Burstrom L, van Dongen MGJ, Boni V, Lee JY, Bedard PL, Malinowska IA, Kaisermann M, McKean W. BEHOLD-1 and -2: phase 1/2 randomized studies evaluating the B7 homolog 4 protein-targeted antibody-drug conjugate mocertatug rezetecan in patients with solid tumors, including endometrial and ovarian cancers. Int J Gynecol Cancer. 2026 Sep 7:105607. doi: 10.1016/j.ijgc.2026.105607. Online ahead of print.
PubMed 42850140