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Despite both being keratinocyte-derived skin cancers, basal cell carcinoma (BCC) responds much less robustly to immunotherapy than cutaneous squamous cell carcinoma (CSCC). The pathologic complete response rate to perioperative PD-1 inhibition in BCC is only 23%, less than half the 51% seen in CSCC, highlighting their distinct immunobiology.
The success of immunotherapy in neoadjuvant and adjuvant settings has rendered the traditional, sequential referral model (dermatologist to surgeon to oncologist) obsolete. Optimal care now demands an integrated, team-based discussion among all specialists *before* the first treatment decision is made to determine the best sequence and timing.
While neoadjuvant hedgehog inhibitors can successfully downstage locally advanced basal cell carcinoma (BCC) before surgery, the three-year recurrence rate is a surprisingly high 36%. This indicates that this strategy reduces surgical complexity but does not eliminate the high underlying risk, often necessitating further treatment.
T-cells have natural inhibitory signals, or "brakes" (like PD-1), to prevent over-activation. Some cancers exploit this. Checkpoint inhibitor drugs block these brakes, unleashing a patient's existing T-cells to attack cancer cells more aggressively. This approach has been miraculous for cancers like melanoma.
With 72% response rates to neoadjuvant immunotherapy, surgeons are shifting from immediate, aggressive surgery to a "wait-and-see" approach. Shrinking the tumor first can turn a morbid, disfiguring operation into a much simpler procedure, fundamentally changing the initial surgical evaluation for cutaneous squamous cell carcinoma (CSCC).
Standard cancer surgery often removes lymph nodes—the factories producing immune cells. Administering immunotherapy *before* this destructive process is critical. It arms the immune system while it is still intact and capable of mounting a powerful, targeted response against the tumor.
Contrary to the common assumption that metastatic disease is the primary cause of cancer-related death, a large international study on CSCC found that two-thirds of patients died from local-regional uncontrolled progression. This highlights the critical importance of effective local control strategies.
Experts argue that radiation therapy is often wrongly perceived as a salvage or adjuvant option. For many patients with early-stage basal or squamous cell carcinomas, it offers local control rates over 95%, comparable to surgery, and should be presented as a primary alternative, especially when cosmetic outcomes are a priority.
Patients receiving systemic immunotherapy for advanced skin cancer are still at high risk for developing new, low-risk primary skin cancers. Medical oncologists should not act as default dermatologists; ongoing co-management is crucial to identify and treat these new lesions while the patient is on systemic therapy.
Instead of a rigid, pre-defined treatment plan, clinicians are adopting a "response-determined" approach for cutaneous squamous cell carcinoma. A tumor initially deemed unresectable can become operable after just one or two doses of immunotherapy, requiring dynamic, ongoing collaboration between surgical and medical oncology teams to adjust the plan.
Dr. Radvanyi advocates for a paradigm shift: treating almost all cancers with neoadjuvant immunotherapy immediately after diagnosis. This "kickstarts" an immune response before standard treatments like surgery and chemotherapy, which are known to be immunosuppressive, can weaken the patient's natural defenses against the tumor.