CD274 and melanoma: Abundant PD‐1/PD‐L1 interactions were associated with early distant disease recurrence in patients with non‐metastatic melanoma in the tdLN, but not in the corresponding tumours,43 suggesting that PD‐L1 expression in the tdLN plays a critical role in orchestrating systemic anti‐tumour immune responses and identifying high‐risk patient populations suitable for anti‐PD‐1/PD‐L1 ICB.