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Fianlimab plus cemiplimab showed objective response rates of 20% to 33% in advanced solid tumors during a Phase 1 study.Early trial shows new cancer drug combo helps some patients with advanced disease

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Key Takeaway
Note early objective response rates of 20% to 33% in advanced solid tumors with this combination during a Phase 1 trial.

This Phase 1, first-in-human study included the dose-expansion portion for patients with advanced non-small cell lung cancer, clear cell renal cell carcinoma, head and neck squamous cell carcinoma, and cutaneous squamous cell carcinoma. The population consisted of anti-PD-1/PD-L1 naive or experienced patients. The intervention was fianlimab 1600 mg plus cemiplimab 350 mg administered intravenously every 3 weeks. No comparator was reported.

The primary outcome was objective response rate per RECIST 1.1. In non-small cell lung cancer naive patients, the rate was 27% based on four partial responses. In non-small cell lung cancer experienced patients, the rate was 7% based on one partial response. In clear cell renal cell carcinoma naive patients, the rate was 20% based on three partial responses. In clear cell renal cell carcinoma experienced patients, the rate was 7% based on one partial response.

In head and neck squamous cell carcinoma naive patients, the rate was 33% based on five partial responses. In head and neck squamous cell carcinoma experienced patients, the rate was 7% based on one partial response. In cutaneous squamous cell carcinoma experienced patients, the rate was 20% based on two complete responses and one partial response. The follow-up duration was 0.7 months.

Adverse events included fatigue at 15%, rash at 12%, pruritus at 10%, infusion-related reaction at 10%, and adrenal insufficiency at 10%. Serious adverse events were not reported. Discontinuations were not reported. The tolerability was described as an acceptable safety profile. The study sample size was not reported. The setting was not reported. Funding or conflicts were not reported. Practice relevance was not reported.

People with advanced cancer often face tough choices when standard treatments stop working. This early study looked at a new combination of two medicines called fianlimab and cemiplimab. Doctors gave these drugs to patients who had not used these specific immune checkpoint inhibitors before, or those who had used them in the past. The goal was to see if the drugs could help shrink tumors in four different types of cancer: non-small cell lung cancer, clear cell renal cell carcinoma, head and neck squamous cell carcinoma, and cutaneous squamous cell carcinoma.

The results showed promise for some groups. Patients who had not used these drugs before saw tumor shrinkage rates of 27 percent for lung cancer, 20 percent for kidney cancer, and 33 percent for head and neck cancer. Those who had used these drugs before saw lower rates of 7 percent across most groups. The study tracked patients for just over seven weeks.

Safety was a major focus. Most side effects were manageable and included fatigue, rash, itching, and reactions during the infusion. Serious problems were not reported, and no patients had to stop the treatment because of safety issues. Because this was a very early stage study with a small number of people, the results are not ready to change how doctors treat patients yet. More research is needed to confirm these findings and see if the benefits last longer.

What this means for you:
Early testing shows a new drug combo helps some patients with advanced cancer shrink their tumors.

Study Details

Study typePhase1
EvidenceLevel 4
Follow-up0.7 mo
PublishedMay 2026
View Original Abstract ↓
BACKGROUND: The dose escalation phase of a first-in-human (FIH) study demonstrated acceptable safety and preliminary antitumor activity of fianlimab (anti-lymphocyte activation gene-3 [LAG-3]) as monotherapy and in combination with cemiplimab (anti-programmed cell death-1 [PD-1]). Here, the authors present safety and clinical activity data from the dose-expansion portion of the FIH study in patients with advanced non-small cell lung cancer (NSCLC), clear cell renal cell carcinoma (ccRCC), head and neck squamous cell carcinoma (HNSCC), and cutaneous squamous cell carcinoma (CSCC). METHODS: Anti-PD-1/PD-L1 naive (N) or experienced (E) patients with advanced NSCLC, ccRCC, HNSCC, and CSCC were enrolled in this phase 1 study (NCT03005782). Patients received fianlimab 1600 mg plus cemiplimab 350 mg intravenously every 3 weeks for up to 24 months. The primary end point was the objective response rate (ORR) per RECIST 1.1. RESULTS: Investigator-assessed ORR was 27% in NSCLC-N (four partial responses [PRs]), 7% in NSCLC-E (one PR), 20% in ccRCC-N (three PRs), 7% in ccRCC-E (one PR), 33% in HNSCC-N (five PRs), 7% in HNSCC-E (one PR), and 20% CSCC-E (two complete responses; one PR). The most common treatment-related treatment-emergent adverse events among patients across all cohorts were fatigue (15%), rash (12%), pruritus (10%), infusion-related reaction (10%), and adrenal insufficiency (10%). CONCLUSIONS: Fianlimab plus cemiplimab demonstrated modest clinical efficacy with an acceptable safety profile in patients with advanced malignancies across several tumor types mostly in treatment-naive patients. Further investigation is warranted.
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