The goal of this observational study is to learn about if new biomarkers such as gut microbiota and molecular genetics melanoma features could predict clinical radiological and pathological response to neoadjuvant monotherapy with anti-PD1 agents in patients with resectable stage IIIB-D melanoma. The main questions it aims to answer are: * radiological and pathological response rate to three doses of antiPD1 agents; * do radiological and pathological responses correlate with gut microbiota and melanoma molecular genetics features Participants will receive three doses of aPD1 monotherapy as per center routine practice and will undergo regional lymphadenectomy. Before treatment initiation patients will be asked to bring faeces probes and fill out dietary questionnaire as well as just before the surgery. After sugery adjuvant therapy will be prescribed for 12 month and patients will be followed up according to institutional routine practice for 5 years.
The clinical efficacy of PD1 inhibitors on the 2-year recurrence-free survival of patients with resectable stage III B-D melanoma will be assessed. This indicator will be compared with a historical control group using adjuvant PD1 immunotherapy and targeted therapy. Various factors will be analyzed for their potential impact on immunotherapy effectiveness, including demographics, disease stage and sub-stage, molecular-genetic status of the tumor, composition of the tumor\'s lymphoid infiltrate, LDH levels, gut microbiome composition, radiological and pathological response to treatment, and the development of immune-mediated adverse events. These findings may help optimize treatment by implementing neoadjuvant therapy for stage III B-D cutaneous melanoma.
Study Type
OBSERVATIONAL
Enrollment
72
Patients with resectable stage IIIB-D melanoma will have a lymph node core biopsy to confirm metastatic lesions, following standard procedures. Additionally, a portion of the tumor tissue will be preserved for biomarker analysis. Participants will then be instructed to submit fecal samples and complete a dietary questionnaire before receiving three doses of PD1 monotherapy, in accordance with the center\'s routine practice, typically spanning 6-10 weeks. Between weeks 10 and 12, a radiological assessment of the response will be conducted. Following this, participants will undergo regional lymphadenectomy, and the pathological response will be evaluated. After surgery, patients will be placed on adjuvant therapy for 12 months as per routine practice of the center . Subsequently, they will be monitored for five years, adhering to the institution\'s standard follow-up protocol.
N.N. Blokhin Russian Cancer Research Center, skin tumor department
Moscow, Russia
RECRUITING2-year disease-free survival
2-year disease-free survival: time from surgery to disease recurrence (either locoregional or distant) or death from any cause
Time frame: time from surgery and up to 2 years follow up
pathological response rate
Rate of pathological complete response, near-to-pCR, non-pCR/disease progression
Time frame: from enrollment to surgery (in average up to 20 weeks)
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