Clinical trial Recruiting at 26 sites Phase 3 Interventional Ages 18 and up

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

PhasePhase 3
Study typeInterventional
Ages18 Years and up
SexAll
Enrollment1792 (estimated)
SponsorUppsala University
Academic / other
Drugs / interventionspembrolizumab, nivolumab, immunotherapy, radiation, prednisone, relatlimab, fianlimab, cemiplimab, vibostolimab
Locations26 sites (Helsinki and 25 other locations)
StatusRecruiting
StartedDecember 19, 2024
Main results expectedSeptember 2030
Study endsSeptember 2033
Registry record updatedMarch 9, 2026
Trial IDNCT06488482 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

  • 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
  • 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

Similar studies

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How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
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Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.