HER2 Mutation Lung Cancer: 11 Real Stories

Stage IV HER2-Positive Non-Small Cell Lung Cancer: Glenna's Survivor Story

Patient Info: Glenna, Female | Stage IV

Biomarkers: HER2 mutation confirmed by blood and tissue biopsy biomarker testing

Stage IV HER2-mutated NSCLC with first-line chemotherapy failure, then ongoing Enhertu from September 2023 and official NED/no evidence of disease status.

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HER2-mutated lung cancer: restarting targeted therapy after lung inflammation

Patient Info: Anonymized, Female, 70+ | Stage IV

Biomarkers: HER2 exon 20 insertion; PD-L1 negative

Metastatic Site: brain

Trastuzumab deruxtecan was restarted successfully after lung inflammation improved, but it was discontinued after 9 cycles when the cancer progressed.

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Stage IV HER2-Positive Non-Small Cell Lung Cancer: Lauren's Patient Story

Patient Info: Lauren, Female, Under 40 | Stage IV

Biomarkers: HER2 mutation

Metastatic Site: Bones/ribs/shoulder; liver

As of September 2025, after about 4 months of targeted therapy, Lauren reported better quality of life, resolved bone pain, improved liver pain, improved liver enzymes, and manageable infusion-week side effects.

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HER2 exon 20 metastatic lung adenocarcinoma with pathologic complete response after chemoimmunotherapy and surgery

Patient Info: Anonymized, Female, 40s | Stage IV

Biomarkers: HER2 exon 20 insertion lung adenocarcinoma with TP53 mutation, PD-L1 TPS 50%, and low TMB.

Metastatic Site: contralateral lung

Right lower lobectomy with radical lymphadenectomy in November 2023 showed pathologic complete response, and no additional therapy was offered after surgery.

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Advanced Non-Small Cell Lung Cancer With ERBB2 and TP53 Mutations

Patient Info: Anonymized, male, 50s | Stage IV

Biomarkers: ERBB2 exon 20 Y772-A775dup mutation; TP53 mutation; PD-L1 TPS 0%

Metastatic Site: liver, bone, both lungs

Imaging after treatment showed stable disease, and he remained in good condition while continuing maintenance pemetrexed and bevacizumab.

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Stage IV HER2-Positive Non-Small Cell Lung Cancer: Samantha's Patient Story

Patient Info: Samantha, Female | Stage IV

Biomarkers: HER2 mutation

Metastatic Site: Lungs/pleural fluid; liver

As of November 2024, Samantha reported a 55% reduction across the board on chemotherapy plus immunotherapy, few side effects, improved energy, and enough function to hike, work, and feel more like herself.

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Metastatic lung adenocarcinoma presenting as a pituitary mass

Patient Info: Anonymized, Female, 60s | Stage IV

Biomarkers: Lung adenocarcinoma with ERBB2 plus other mutations, PD-L1 TPS 1%

Metastatic Site: pituitary gland

As of May 2024, metastatic lung adenocarcinoma to the pituitary/sellar region had been diagnosed pathologically; systemic treatment, recurrence status, and longer follow-up were not described.

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ERBB2-Mutated Stage III Lung Cancer With Liver Recurrence and Multiple Lines of Therapy

Patient Info: Anonymized, female, 60s | Stage IV

Biomarkers: ERBB2 exon 20 insertion

Metastatic Site: liver

After 6 months of disease control on vinorelbine plus trastuzumab, the cancer progressed in all sites and she chose hospice care.

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Stage IV ERBB2-Mutated Lung Adenocarcinoma Responding to HER2-Targeted Therapy

Patient Info: Anonymized, female, 60s | Stage IV

Biomarkers: ERBB2 exon 20 insertion

Metastatic Site: bilateral lungs

Afatinib showed a response after 1 month, but insurance denial required a return to trastuzumab-based treatment.

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Stage IV ERBB2-Mutated Lung Cancer With Extensive Bone Metastases

Patient Info: Anonymized, female, 60s | Stage IV

Biomarkers: ERBB2 exon 20 insertion. A PIK3CA mutation was later detected at progression and considered a possible resistance mechanism.

Metastatic Site: bone

After progression on pemetrexed following several earlier treatment lines, she transitioned to hospice care.

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Stage IV ERBB2-Mutated Lung Adenocarcinoma With Brain Metastases and Multiple Targeted Therapies

Patient Info: Anonymized, female, Under 40 | Stage IV

Biomarkers: ERBB2 exon 20 insertion, exact sequence not specified. ERBB2 copy-number gain was identified during progression on afatinib.

Metastatic Site: brain, adrenal gland, liver

The final documented afatinib plus bevacizumab rechallenge produced a mixed response followed by liver progression after 3 months.

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