Introduction Pembrolizumab, an immune-checkpoint inhibitor, is approved for first-line treatment of metastatic NSCLC in patients with tumours expressing programmed death-ligand 1 (PD-L1) with tumour proportion score (TPS) of ≥50%. We aimed to clarify some uncertainties regarding use of immunotherapy in patients with previous autoimmune (AI) disorders and assess real-world outcomes following treatment completion. Methods We performed a retrospective case record review of 82 patients with tumours expressing PD-L1 at TPS ≥ 50% and receiving first-line Pembrolizumab. Survival was estimated using the Kaplan Meier method. Results After 36.93 months (IQR: 34.37–40.20) median follow-up, median OS was 13.6 months (95% CI 8.9–19.3). There were 10 patients (12%) with AI co-morbidities and there was a trend toward improved median OS for this group versus those without AI comorbidity, 42 months (14.87-NR) versus 10.7 months (7.3–17.8), p = 0.073. Sixteen patients (20%) with nonprogressive disease at 2 years had significantly better median OS compared to those who did not complete 2 years of treatment, NR (42- NR) and 8.7 (5.8–14.1), p < 0.001. Immune related adverse events (irAE) of any grade occurred in 90% of the AI cohort compared with 70.8% of patients without AI comorbidity. Low grade adrenal insufficiency was the only irAE which occurred at a significantly higher rate in the AI group, p = 0.02. Conclusion Patients with previous AI diseases tolerate treatment well, and there is a non-significant trend for improved outcomes in this group. Patients who complete the course of pembrolizumab have significantly better survival outcomes than those who do not.

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716 Background: CRP, a biomarker of systemic inflammation, has been shown to have prognostic value in numerous tumour types, including mRCC. The combination of the immune check inhibitor (ICI), pembro, and vascular endothelial growth factor receptor tyrosine kinase inhibitor (VEGFR-TKI) axi is one of several internationally approved combination ICI/VEGFR-TKI treatment options. We evaluated the predictive value of biomarkers of systemic inflammation in a real-world cohort of patients with mRCC treated with pembro and axi. Methods: Retrospective data of patients treated with pembro and axi were collected from a regional electronic database from two large cancer centres. Inflammatory biomarkers from routine blood tests (including haemoglobin, neutrophil count, platelets, albumin and CRP) prior to starting treatment were recorded. The IMDC score and modified Glasgow Prognostic Score (combining albumin and CRP) were calculated. The primary end point, progression free survival (PFS), was defined as the time between initiation of treatment and clinical or radiographical progression or death, or censorship. Overall survival, defined as the time between initiation of treatment and death, or censorship was also calculated. Univariate and multivariate analyses were undertaken using Cox Regression model and the relationship between different markers and PFS was assessed using Kaplan-Meier curves. Results: Data were available for 93 patients. 74 pts (80%) had clear cell histology, 19 pts (20%) had non-clear cell and 11 pts (12%) had sarcomatoid component. 46 patients had previous nephrectomy. 15 (16%), 46 (50%) and 32 (34%) pts respectively were classified as favourable, intermediate, and poor risk group as per IMDC score. Median PFS was 10.7 (IQR 4.6-not reached) months after a minimum 12.5 months follow-up. Baseline CRP was recorded in 77 (83%) patients, reflecting current routine clinical guidelines. On univariate analysis, neutrophils (≤7.5x109/L/>7.5x109/L) (p=0.044), platelets (≤400 x109/L/>400x109/L) (p=0.043), CRP (≤10mg/L/>10mg/L) (p=0.001), mGPS (0/1/2) (p=0.004) and IMDC risk group (low/intermediate/poor) (p=0.038) were predictive of PFS. On multivariate analyses only CRP was associated with PFS (HR2.78 (95% CI, 1.42-5.44) (p=0.003). At a 1-year landmark PFS was 62% (CRP ≤10mg/L) v 29% (CRP >10mg/L) (p=0.002). CRP also predicted OS ((HR4.50 (95% CI, 1.58-12.8) (p=0.005)) with 1-year OS 85% (CRP ≤10mg/L) v 59% (CRP >10mg/L) (p=0.002). Conclusions: CRP, a biomarker of systemic inflammation, predicts survival in mRCC patients undergoing combined ICI/VEGF-TKI therapy. Our findings support comparable studies in the mRCC population and routine recording of CRP in patients with mRCC. We advocate further work to validate utilisation of CRP as a prognostic biomarker for mRCC in clinical practice.