Trastuzumab for Lung Cancer: 9 Real Stories

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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Metastatic lung adenocarcinoma with HER2 V659E/amplification responding to trastuzumab deruxtecan

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

Biomarkers: Initial lung testing showed no EGFR/ALK/ROS1 and PD-L1 TPS 3%. Later biopsy found HER2 V659E plus HER2 amplification.

Metastatic Site: liver, bone, brain

As of September 2024, metastatic lung adenocarcinoma had a sustained partial response to trastuzumab deruxtecan after HER2 V659E mutation and HER2 amplification were identified.

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HER2-positive metastatic lung cancer treated with trastuzumab deruxtecan (Enhertu)

Patient Info: Anonymized, Female | Stage IV

Biomarkers: ERBB2/HER2 copy-number gain of at least 20 copies; TP53 C242fs; CDK12 copy-number gain; tumour mutational burden 3.2 mutations/Mb

Metastatic Site: lungs / multiple pulmonary nodules

Trastuzumab deruxtecan reduced the pulmonary nodules by more than 50% at 3 months and produced a documented response lasting 13.8 months.

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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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ERBB2-Mutated Metastatic Lung Adenocarcinoma With Leptomeningeal Progression

Patient Info: Anonymized, male

Biomarkers: ERBB2 A775_G776 insYVMA mutation with amplification

The final treatment produced a mixed systemic response, but leptomeningeal disease developed.

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ERBB2-Mutated Metastatic Lung Adenocarcinoma With Limited Disease Control Across Multiple Therapies

Patient Info: Anonymized, female

Biomarkers: ERBB2 V776delinsVC mutation

After temporary stable disease when bevacizumab was added to chemotherapy, the cancer progressed on trastuzumab plus paclitaxel and then erlotinib.

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