Short versus long immunotherapy after radical surgery for high-risk malignant melanoma
Official title: A Prospective Randomized International Multicenter Study to Compare Short Versus Long Adjuvant Immunotherapy After Radical Surgery of Stage IIb-c, III and IV Cutaneous Malignant Melanoma (Grand SLAM)
Run by Uppsala University · NCT06488482 · Data updated 2026-11-12
This will test whether six months of immunotherapy works as well as the standard 12 months for adults who have had surgery for high-risk melanoma.
Quick facts
| Phase | Phase 3 |
|---|---|
| Study type | Interventional |
| Ages | 18 Years and up |
| Sex | All |
| Enrollment | 1792 (estimated) |
| Sponsor | Uppsala University Academic / other |
| Drugs / interventions | pembrolizumab, nivolumab, immunotherapy, radiation, prednisone, relatlimab, fianlimab, cemiplimab, vibostolimab |
| Locations | 26 sites (Helsinki and 25 other locations) |
| Status | Recruiting |
| Started | December 19, 2024 |
| Main results expected | September 2030 |
| Study ends | September 2033 |
| Registry record updated | March 9, 2026 |
| Trial ID | NCT06488482 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Adults (≥18 years) with stage IIb-c, III, or IV cutaneous malignant melanoma who have had radical surgery, have ECOG 0-1, and meet standard organ-function requirements for immunotherapy are the intended participants.
✕Probably not a fit
Patients with ongoing progressive disease after neoadjuvant therapy, inadequate organ function, or those with lower-stage melanoma not meeting eligibility are unlikely to benefit from enrollment.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This is a prospective, randomized, international phase 3 study comparing a shorter (six-month) versus standard (twelve-month) course of adjuvant PD-1 immunotherapy (nivolumab or pembrolizumab) after radical surgery for stage IIb-c, III, and IV cutaneous malignant melanoma. Eligible adults with ECOG 0-1 and adequate organ function are randomized at participating centers and followed for recurrence and safety outcomes. Neoadjuvant immunotherapy is allowed in some cases if a complete pathological response was not achieved. The trial aims to determine whether the shorter regimen preserves efficacy while reducing severe toxicity, visit burden, and drug costs.
Why it matters
Potential benefit: If successful, a six-month regimen could provide the same protection against recurrence with fewer severe side effects, fewer hospital visits, and lower treatment costs.
How similar studies have gone: Previous adjuvant trials have shown that 12 months of PD-1 therapy reduces recurrence risk, but no randomized trial has yet proven that a six-month regimen is equally effective.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: 1. Provision of written informed consent for participation. 2. ≥ 18 years of age. 3. Performance status ECOG/WHO 0-1. 4. Adequate organ functions as per standards for immunotherapy. 5. Radical surgery for CMM (including acral) stage IIb-c, III (including in transit) and IV. Stage III CMM patients with unknown primary and stage IIb-c CMM patients who have not undergone sentinel node procedure are eligible. 6. A complete physical examination within 28 days prior to randomization 7. Previous adjuvant treatment with BRAF + MEK inhibitors is allowed. 8. Neoadjuvant treatment with immunotherapy for two months (currently pembrolizumab every third weeks three times or nivolumab every fourth week two times) is allowed providing that a complete or near complete pathological response was not achieved and patients with clear progressive disease according to the pathology report are not eligible. 9. All participants who have not received neo-adjuvant treatment must have disease-free status documented by radiological assessment within 28 days prior to randomization while 6 weeks is sufficient for neo-adjuvant treated patients. 10. Participants must be off immunosuppressive doses of systemic steroids (\>10 mg/day prednisone or equivalent) for a minimum of 14 days prior to study drug administration. 11. Sufficient renal function for radiological assessments with i.v. contrast. 12. Peri-operative radiation therapy is allowed. 13. Patients who experience a locoregional lymph node relapse, i.e. stage III disease or operable stage IV at a time-point later than primary diagnosis are welcome to participate. Exclusion Criteria: 1. The patient is, in the opinion of the investigator, assessed as unfit to receive systemic adjuvant treatment. 2. Serious and/or uncontrolled medical disorder that in the opinion of the investigator is contraindicated. 3. An active, known, or suspected autoimmune disease. Participants with type I diabetes mellitus, hypothyroidism requiring hormone replacement only and skin disorders (such as vitiligo, psoriasis, or alopecia) not requiring systemic treatment are eligible. 4. Life-expectancy less than 2 years due to concurrent disease (e.g., cardiac disease and liver cirrhosis). 5. Inability to provide informed consent or refusal to do so. 6. Inability to comply with the study protocol. 7. Participation in other clinical trials interfering with the current study protocol. 8. Existing or previous malignancies within the past 5 years (except for in situ breast and in situ cervical cancer, melanoma in situ, malignant melanoma, non-melanoma skin cancer and low risk prostate cancer). 9. Pregnancy or planned pregnancy. 10. Ocular and mucosal melanoma.
Where it's running
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Helsinki University Hospital
Helsinki, Finland Recruiting -
Kuopio University Hospital
Kuopio, Finland Recruiting -
Tampere University Hospital
Tampere, Finland Recruiting -
Turku University Hospital
Turku, Finland Recruiting -
Ålesund Hospital
Ålesund, Norway Recruiting -
Haukeland University Hospital
Bergen, Norway Recruiting
Show 20 more locations
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Sorlandet Hospital
Kristiansand, Norway Recruiting -
Akershus University Hospital
Oslo, Norway Recruiting -
Oslo University Hospital
Oslo, Norway Recruiting -
Stavanger University Hospital
Stavanger, Norway Recruiting -
North Norway University Hospital
Tromsø, Norway Recruiting -
Trondheim University Hospital
Trondheim, Norway Recruiting -
Eskilstuna Hospital
Eskilstuna, Sweden Recruiting -
Falu Hospital
Falun, Sweden Recruiting -
Gävle Hospital
Gävle, Sweden Recruiting -
Sahlgrenska University Hospital
Gothenburg, Sweden Recruiting -
Ryhov Hospital
Jönköping, Sweden Recruiting -
Kalmar Hospital
Kalmar, Sweden Recruiting -
Karlstad Hospital
Karlstad, Sweden Recruiting -
Linköping University Hospital
Linköping, Sweden Recruiting -
Skåne University Hospital
Lund, Sweden Recruiting -
Örebro University Hospital
Örebro, Sweden Recruiting -
Karolinska University Hospital
Stockholm, Sweden Recruiting -
Sundsvall Hospital
Sundsvall, Sweden Recruiting -
Växjö Hospital
Vaxjo, Sweden Recruiting -
Västmanland Hospital
Västerås, Sweden Recruiting
Study contacts
- Principal investigator: Gustav J Ullenhag, professor — Uppsala University Hospital
- Study coordinator: Gustav J Ullenhag, professor
- Email: Gustav.Ullenhag@IGP.uu.se
- Phone: +46-18-6110000
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.