This clinical trial aims to evaluate the effectiveness of a new treatment approach for patients with stage III or IV melanoma that has spread to other parts of the body but can still be surgically removed. The study combines two treatments: LTX-315 and pembrolizumab. Melanoma that has spread to other parts of the body can often be treated with surgery. Despite surgery, there is a high risk of the cancer coming back. Pembrolizumab, an immune checkpoint inhibitor, can reduce this risk when given after surgery. Recent studies have shown that giving pembrolizumab before surgery, along with post-surgery treatment, might be more effective than giving it only after surgery. However, many patients still experience cancer recurrence. Combining pembrolizumab with LTX-315, which triggers a different immune response, might improve the treatment\'s effectiveness and reduce the risk of cancer progression before surgery. This is an open-label Phase II study, meaning both the researchers and participants will know which treatments are being given. The study will be conducted at a single center and will involve about 27 participants. They will receive LTX-315 and pembrolizumab before their planned surgery to see if this combination could be more effective than pembrolizumab alone. The primary goal is to assess the tumors response to the neoadjuvant (pre-surgery) treatment, specifically looking at the rate of pathological complete response (pCR), where no cancer is detected in the removed tumor tissue.
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Complete Pathologic Response Rate
Timeframe: 12 weeks after start of treatment