# Nivolumab induces seven-year sustained remission in a patient with advanced PD-L1-positive lung adenocarcinoma: a case report

## TL;DR

A patient with advanced lung cancer achieved long-term remission using nivolumab, an immune therapy drug, showing its potential for durable treatment.

## Contribution

Demonstrates nivolumab's long-term efficacy in PD-L1-positive lung cancer with over seven years of sustained remission.

## Key findings

- The patient had a partial response to nivolumab with progression-free survival exceeding 82 months.
- Treatment-related adverse events were mild and well-tolerated in an elderly patient with multiple comorbidities.
- Nivolumab induced durable immune responses, enabling long-term survival in PD-L1-high advanced NSCLC.

## Abstract

To summarize the clinical experience of a patient with advanced non-small cell lung cancer (NSCLC) who achieved long-term survival after treatment with the programmed cell death protein 1 (PD-1) inhibitor nivolumab.

We retrospectively analyzed the case of a 78-year-old male patient diagnosed in April 2018 with right lung adenocarcinoma (cT4N3M1a, stage IV). The patient was driver-gene negative but had a high PD-L1 tumor proportion score (TPS of 90%). He received five cycles of first-line chemotherapy with pemetrexed and cisplatin (PP regimen), which was followed by sequential maintenance therapy with nivolumab (200 mg, Q3W).

After initial response, the disease progressed following first-line chemotherapy. After switching to nivolumab, radiographic evaluation indicated a partial response (PR), which was subsequently assessed as an ongoing response. As of March 2025, the patient remains in continuous remission, with a progression-free survival (PFS) exceeding 82 months and an overall survival (OS) exceeding 84 months. Treatment-related adverse events were mild, and tolerance was excellent.

For patients with PD-L1-high advanced NSCLC, nivolumab monotherapy can induce deep and durable immune responses, enabling long-term survival with a manageable safety profile, even in elderly patients with multiple comorbidities. This case provides compelling real-world evidence for the remarkable efficacy of immune checkpoint inhibitors.