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OA08 - Targeted Therapies in Brain Metastases (ID 381)
- Event: WCLC 2016
- Type: Oral Session
- Track: Advanced NSCLC
- Presentations: 1
OA08.07 - BRAF-V600E Advanced Lung Adenocarcinoma with Leptomeningeal (LM) Disease Treated with Vemurafenib (ID 4800)
16:00 - 17:30 | Author(s): J.C. Machado
BRAF mutations occur in around 3% of non-small cell lung cancers (NSCLC) and V600E accounts for 50%. BRAF V600E is an attractive molecular target for cancer tyrosine kinase treatment, but ideal treatment is still not defined.
A case of a patient with BRAF-mutated non–small cell lung cancer (NSCLC) detected by NGS Ion torrent technology who presented with LM disease and was treated with the selective BRAF inhibitor vemurafenib is described.
58 years old, female, non-smoker, who presented in the emergency department with pericardial effusion. Pericardial fluid cytology confirmed adenocarcinoma TTF1 positive. Multi-organ metastatic disease was diagnosed (bone, lung and thyroid) without EGFR mutation or ALK-EML4 translocation. Four cycles of chemotherapy with pemetrexed and carboplatin were done. She started with refractory headache and vomiting, brain CT and MRI showed no evidence of metastasis, a lumbar puncture confirmed malignant cells in the cerebrospinal fluid. A BRAF V600E was detected by NGS, Ion Torrence PGM technology in the initial tumour sample and in plasma circulating free DNA. An off-label treatment with vemurafenib 960 mg q12hr was offered to the patient, with clinical improvement and radiologic lung stability. At month 2 of treatment, the patient developed respiratory insufficiency with lung infiltrates and Influenza A virus was identified in a nasal swab. Vemurafenib was temporary suspended and re-introduced until 720 mg q12h and maintained until disease progression (large volume pleural effusion with positive cytology), at month 6 of vemurafenib tretament. Third line treatment is being planned.
The authors highlight the importance of using a multiplex screening strategy to detect targetable mutations in advanced lung cancer patients. The application of next generation sequencing to the tumour and plasma cfDNA allowed the detection of a BRAF-V600E mutation. The improvement of neurologic symptoms and disease control achieved with vemurafenib supports vemurafenib´s efficacy. Care should be taken to the possibility of occurring lung toxicity.
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