The HER Project: HRD in EGFR-mutated NSCLC (HER)

December 24, 2025 updated by: Francesca Rita Ogliari, IRCCS San Raffaele

The HER Project: Homologous Recombination Deficiency in EGFR-Mutated NSCLC, a Retrospective and Prospective Translational Single-center Study

This observational retrospective-prospective study aims to evaluate the prevalence of homologous recombination deficiency (HRD) in metastatic EGFR mutated NSCLC and to assess its correlation with clinical and molecular features. Based on the hypothesis that HRD identifies a distinct EGFRm subgroup with prognostic value and a potential sensitivity to PARP inhibitor-based strategies, translational analysis will be performed with multiple pre-clinical models, ranging from human cancer cells to murine models.

Study Overview

Status

Active, not recruiting

Conditions

Intervention / Treatment

Detailed Description

Introduction

Lung cancer is the most common diagnosed cancer, with almost 2.5 million new cases per year, and the leading cause of cancer-related death (18.7%), according to GLOBOCAN (2022). Non-small cell lung cancer (NSCLC) is the most prevalent subtype, accounting for 85% of lung cancers. Epidermal growth factor receptor (EGFR) is a transmembrane tyrosine kinase receptor that regulates survival, proliferation and differentiation in mammalian cells. EGFR mutations occur in around 30% of patients affected by NSCLC, representing the second most frequent targetable oncogenic driver in NSCLC.

The treatment landscape for metastatic EGFR-mutated (EGFRm) NSCLC has significantly evolved since the introduction of 1st generation tyrosine kinase inhibitors (TKIs) in 2010. While osimertinib (a 3rd generation TKI) is currently the standard first-line treatment worldwide in the advanced setting, emerging combination strategies, such as osimertinib plus chemotherapy (FLAURA2 trial) or lazertinib plus amivantamab (MARIPOSA trial), improved progression-free survival (PFS) and overall survival (OS) compared to TKI alone. However, these drug combinations often cause increased treatment-related toxicities, impacting both patients' quality of life and healthcare costs. For this reason, it becomes crucial to identify predictive biomarkers to guide patient selection for combination therapies. For example, post-hoc analyses of FLAURA2 were conducted on poor-risk populations, such as EGFRm patients with high tumour burden or TP53 co-mutations. Despite better outcomes of chemotherapy plus osimertinib across all patient subgroups, only 1 out of 4 patients had baseline tissue samples available for wider genome sequencing. Therefore, understanding the role of co-alterations in EGFRm tumours remains to be explored, particularly those associated with shorter OS and/or more aggressive clinical presentations.

Targeting HRD pathway with PARP-inhibitors in Non-small cell lung cancer

Homologous recombination deficiency (HRD) is a condition linked to an impaired DNA repair mechanism that contributes to genomic instability in several cancers, including NSCLC. PARP-inhibitors (PARPi), drugs targeting a key protein involved in DNA repair, are already available in clinical practice for the treatment of other HRD-positive subgroups of solid tumours (e.g. breast, ovarian, prostate cancer). In NSCLC, however, their clinical benefit remains unclear. Previous studies evaluating PARPi in NSCLC, including combinations with chemotherapy or immunotherapy, have shown modest or non-significant improvements in PFS and OS. However, a significant limitation of these studies is the lack of HRD status assessment, which may have diluted the expected benefits in HRD-positive patients.

Interestingly, emerging evidence suggests that a higher Genomic Scarring Score (GSS), a surrogate for HRD, may predict PARPi sensitivity better than the traditional assessment of the mutational status of homologous recombination repair (HRR) genes. In this study, the administration of PARPi significantly delayed tumour growth in patient-derived xenograft (PDXs) with high GSS, half of which carried pathogenic/likely pathogenic somatic HRR mutations. Importantly, favourable responses to the PARPi-olaparib were observed regardless of HRR gene mutation status, underscoring the potential of GSS as a robust biomarker to more effectively select patients for PARPi-based therapies.

HRD in EGFR mutated NSCLC

In a Chinese cohort of HRD-positive NSCLC, EGFR-mutated tumours are associated with poor TKI response, which might be explained by gene amplifications like MET, a common resistance mechanism that can be promoted by HRD. Studies also showed the co-occurrence of biallelic TP53 mutations and high HRD score in poor-risk EGFRm NSCLC, suggesting a link between this tumour genotype and TKI-resistance. In preclinical models of NSCLC, osimertinib-resistant EGFRm cell lines exhibited sensitivity to olaparib, leading to increased DNA damage and cell death via a pro-oxidant state. Moreover, combining osimertinib with a PARPi in vivo significantly improved tumour regression compared to osimertinib alone. Altogether, these findings lead to hypothesize that the HRD positive score/GSS may define a patient subgroup that could benefit from PARPi-based combination therapy.

Clinical trials evaluating EGFR-TKIs with PARPi failed to achieve their primary endpoint of PFS, possibly due to a lack of patient selection based on HRD score or other molecular criteria. However, subsequent analyses of the GOAL trial found a stronger synergy between gefitinib (a 1st generation TKI) and olaparib in tumours with higher BRCA1 expression, supporting a predictive role for targeting DNA damage repair pathways. In operable NSCLCs, the percentage of HRD positive tumours is ~20-30%, suggesting that the acquisition of HRD status could be an early event. Importantly, a similar incidence was observed in a Chinese cohort of any-stage EGFRm or ALK-rearranged NSCLC patients in which the cases with high HRD score are ~33% of the total. The sensitivity of EGFRm tumours to platinum-based doublets, which is a known characteristic of HRD-positive tumours, and a larger compendium evidence of chromosomal instability further support exploring the role of HRD in EGFR-mutated lung cancer, paving the way for new targeted therapeutic approaches.

The HER Project

With the HER project, we will investigate the role of HRD and genomic instability (GSS) in EGFRm NSCLC by i) defining the fraction of metastatic EGFRm tumours with HRD positive score, ii) correlating HRD score with patient outcomes, and iii) assessing the synergic efficacy of EGFR-TKIs plus PARPi based on the HRD score in different preclinical settings, ranging from cell lines to a murine model of spontaneous EGFRm lung cancer. We expect that this drug combination will be effective in a specific subset of EGFR tumors. However, even if we won't observe any relevant findings by targeting this pathway, our work will increase our knowledge about DNA damage repair and drug resistance in EGFRm tumours.

Study Type

Observational

Enrollment (Estimated)

100

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Italy
    • MI
      • Milan, MI, Italy, 20132
        • Dept. Medical Oncology

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Sampling Method

Non-Probability Sample

Study Population

Adult patients (≥18 years) with metastatic EGFR-mutated NSCLC eligible for treatment with EGFR-TKI according to standard clinical practice, with available tumor tissue suitable for HRD testing

Description

Inclusion Criteria:

  1. Participant is willing and able to give informed consent for participation in the study. However, since a part of the study is retrospective and, considering the large sample sizes required and considering that the disease involved in this study affects elderly subjects with co-morbidities and presents a significant mortality rate based on the stage of the disease, deceased and untraceable patients will also be included.
  2. Age ≥18 years old
  3. Have a metastatic histologically confirmed NSCLC
  4. Presence of EGFR common mutations (i.e. ex19del and L858R)
  5. Have sufficient biological material to assess genomic profiling with AmoyDx Focus panel or similar
  6. Clinical data available

Exclusion Criteria:

  1. Insufficient baseline tumour tissue (unsuitable for HRD scoring)
  2. Presence of EGFR uncommon mutations (i.e. ex20ins)
  3. Known presence of co-occurring uncommon EGFRm, ALK, ROS1, or other main oncogenic drivers.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
Retrospective Cohort
Patients with metastatic EGFR-mutated NSCLC diagnosed and treated between January 2020 and September 2025, with tumour tissue available for HRD analysis.
Other: No Intervention: Observational Cohort
Observational study only; participants receive standard-of-care treatments not assigned by the study
Prospective Cohort
Patients with newly diagnosed metastatic EGFR-mutated NSCLC, with baseline tumour tissue available for HRD testing and prospectively collected clinical follow-up.
Other: No Intervention: Observational Cohort
Observational study only; participants receive standard-of-care treatments not assigned by the study

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Prevalence of HRD in metastatic EGFRm NSCLC
Time Frame: Baseline (T0), on diagnostic tumour sample
Proportion of EGFRm NSCLC with an HRD positive score evaluated by AmoyDx HRD Panel or similar (GSS ≥ 50).
Baseline (T0), on diagnostic tumour sample

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Correlation between HRD status and clinical outcomes and molecular features
Time Frame: Up to 3 years of follow-up for PFS/OS; baseline for clinical and molecular characteristics.

Assessment of the association between HRD status (positive vs negative) and:

  • Clinical outcomes including progression-free survival (PFS), defined as time from initiation of first line treatment to evidence of progressive disease, and overall survival (OS), defined as time from initiation of first line treatment to death.
  • Baseline clinical characteristics
  • Baseline molecular features including EGFR mutation type, variant allele frequency (VAF) and other co-occurring molecular alterations
Up to 3 years of follow-up for PFS/OS; baseline for clinical and molecular characteristics.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

IRCCS San Raffaele

Investigators

  • Principal Investigator: Francesca Rita Ogliari, Medical Doctor, IRCCS Ospedale San Raffaele

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

December 1, 2025

Primary Completion (Estimated)

December 31, 2029

Study Completion (Estimated)

December 31, 2032

Study Registration Dates

First Submitted

December 11, 2025

First Submitted That Met QC Criteria

December 11, 2025

First Posted (Estimated)

December 24, 2025

Study Record Updates

Last Update Posted (Actual)

December 31, 2025

Last Update Submitted That Met QC Criteria

December 24, 2025

Last Verified

December 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • The HER Project

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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