6040 Background: The median progression-free survival (mPFS) of anti-PD-1 monoclonal antibody (mAb) plus gemcitabine (G) and cisplatin (C) in the first-line treatment of metastatic nasopharyngeal carcinoma (M NPC) is still limited in about 10 ~12 months. The tolerance is also unfavorable, especially for patients (pts) who had undergone platinum-based chemoradiotherapy (CRT) previously. We performed a phase 2 study to explore the potency of replacing cisplatin with anloinib (A), a multi-kinase inhibitor in combined with penpulimab (P), a novel anti-PD-1 mAb as the first-line treatment of M NPC for pts with prior explosure of platinum-based CRT. Here we report the updated long term outcomes of this study. Methods: This is a prospective, three cohorts, single-arm study. Eligible pts were aged 18 ~ 75 years old, diagnosed with NPC and developed metastasis after platinum-based CRT. Pts who were diagnosed as having M NPC at the first visit or experienced treatment failure within 6 months after definitive CRT or adjuvant therapy were excluded. Pts were randomized to receive G + A + P (cohort GAP), G + C + A + P (cohort GCAP) or G+C+P (cohort GCP). Gemcitabine (1000mg/m2, d1, d8) and cisplatin (80mg/m2, d1) were given intravenously for 4 to 6 cycles, 3 weeks per cycle. Penpulimab (200mg, d1) and anlotinib (10mg, qd, d1-14) were given intravenously and orally respectively until disease progression, or unacceptable toxicities. The primary endpoint was objective response rate (ORR). Results: 21 pts were randomized to three cohorts in lead-in phase while only cohort GAP was selected into expansion phase to enrolled another 7 pts. Finally, totally 28 pts were enrolled and received study treatment. The data cutoff date was December 1, 2023. The median follow-up was 20.2 month (95% CI: 17.0, 23.4). The results were summered in the table below. In cohort GAP, the confirmed ORR was 92.3% (95% CI: 64.0%, 99.8%) and the mPFS was still not reached (95% CI: NE, NE). The most common Grade 3 treatment-related adverse event (TRAE) was neutrophil count decreased (3 pts). Only one patient occurred Grade 4 TRAE (neutrophil count decreased) and no treatment-related death was observed. Conclusions: The long term outcomes of this phase 2 study preliminarily disclosed the advantage of the treatment regimen including gemcitabine, anlotinib and penpulimab as the first-line treatment of M NPC, especially for pts who had exposed to platinum-based chemotherapy. The further study with more sample size is warranted. Clinical trial information: NCT04736810 . [Table: see text]