A new standard of care for patients with surgically unresectable stage III non-small cell lung cancer

Real-world survival outcomes, treatment patterns, and impact of PD-L1 expression among patients with unresectable, stage III NSCLC treated with CRT → durvalumab in Canada: The RELEVANCE study

BACKGROUND

Chemoradiotherapy (CRT) followed by durvalumab (CRT → durvalumab) is standard of care to treat patients with unresectable, stage III non-small cell lung cancer (NSCLC). The RELEVANCE study was designed to provide real-world effectiveness and safety data for CRT → durvalumab in Canadian settings.

PATIENTS AND METHODS

RELEVANCE was a retrospective, observational, multicenter chart review that included adult patients with unresectable, stage III NSCLC treated with CRT alone or CRT → durvalumab at 5 Canadian cancer centers. Key outcomes included treatment patterns, adverse events of special interest (AESI), and overall survival (OS).

RESULTS

487 patients were included (144 CRT alone; 343 CRT → durvalumab). Median follow-up was 43.1 and 35.8 months for the CRT alone and CRT → durvalumab groups, respectively. The most frequently observed regimen included radiotherapy dose 54-66 Gy and radiosensitizing carboplatin. Median treatment duration was 1.5 months (CRT alone) and 13.4 months (CRT → durvalumab), and 47 % of patients completed a full course of durvalumab. Median OS and 3-year OS rate were 21.3 months and 32 % for CRT alone and 44.6 months and 56 % for CRT → durvalumab. Exploratory analysis by programmed cell death-ligand 1 (PD-L1) expression status of the CRT → durvalumab group noted 3-year OS rates of 69 %, 44 %, and 39 % in the PD-L1 ≥ 50 % (high), 1 %-49 % (intermediate), and < 1 % (negative) populations, respectively (32 %, 38 %, and 24 % for CRT alone, respectively). PD-L1 high expression was associated with lower risk of death vs. PD-L1 negative expression (P < 0.05). The most common AESI with CRT → durvalumab was pneumonitis. Median OS for patients who completed durvalumab was not reached and was 41.3 months among patients who discontinued durvalumab due to AEs.

CONCLUSION

Results validate the treatment benefit and safety of the PACIFIC regimen in real-world Canadian settings. Among patients who received CRT → durvalumab, there was a correlation between increasing PD-L1 status and improved OS; however, shorter OS was observed in patients discontinuing durvalumab early due to AEs.

TWITTER ABSTRACT

Real-world Canadian RELEVANCE study validates effectiveness and safety of durvalumab in patients with unresectable, stage III NSCLC.

Current Surgical Indications for Non-Small-Cell Lung Cancer

With recent strides made within the field of thoracic oncology, the management of NSCLC is evolving rapidly. Careful patient selection and timing of multi-modality therapy to permit the optimization of therapeutic benefit must be pursued. While chemotherapy and radiotherapy continue to have a role in the management of lung cancer, surgical therapy remains an essential component of lung cancer treatment in early, locally and regionally advanced, as well as in selected, cases of metastatic disease. Recent and most impactful advances in the treatment of lung cancer relate to the advent of immunotherapy and targeted therapy, molecular profiling, and predictive biomarker discovery. Many of these systemic therapies are a part of the standard of care in metastatic NSCLC, and their indications are expanding towards surgically operable lung cancer to improve survival outcomes. Numerous completed and ongoing clinical trials in the surgically operable NSCLC speak to the interest and importance of the multi-modality therapy even in earlier stages of NSCLC. In this review, we focus on the current standard of care indications for surgical therapy in stage I-IV NSCLC as well as on the anticipated future direction of multi-disciplinary lung cancer therapy.