ONCAlert | Upfront Therapy for mRCC
Lung Cancer Case Studies

Diagnosis of Metastatic ALK-Rearranged NSCLC

Corey J. Langer, MD
Published Online:Aug 02, 2017
In this case-based interview, Corey J. Langer, MD, reviews the case of a patient with metastatic ALK-translocated NSCLC. Dr Langer highlights the options for treating the patient through progression based on recent research.

ALK-Translocated Non-Small Cell Lung Cancer With Bone Metastases

Corey J. Langer, MD: This is a 51-year-old female never-smoker who presents with fatigue, chest pain, and low-back discomfort and is discovered to have a 4.5 cm right-upper-lobe mass with hilar adenopathy on a chest X-ray and confirmed on a CT scan. A diagnostic biopsy shows adenocarcinoma, and molecular testing, which at this point is standard in non–small cell, reveals FISH positivity for ALK translocation.

They’ve done the proper workup. In this day and age, this would include FISH testing for both ALK and ROS1 and mutation testing, ideally next-generation sequencing. So, we look not just for EGFR but BRAF, HER2, c-MET, etc. And PD-L1 testing in this patient, in fact, was negative, which is not uncommon—ALK-positive/PD-L1-negative, EGFR-positive/PD-L1-negative. The patient undergoes a PET scan that confirms lumbar spine metastases, which explain her low-back discomfort and also confirm stage 4 status. Otherwise, this patient would have stage 3 disease and would probably be best treated with a combined modality approach. But with bone involvement, local advanced-type strategy makes no sense. So, the patient is started on crizotinib, which is the “standard” agent in this setting.

In the past 5 to 10 years, the standard approach for patients with lung cancer, specifically adenocarcinoma of the lung, is to interrogate the tumor on a molecular basis. Originally, we were looking for EGFR mutation. That’s now expanded. We look for EGFR mutation, we look for ALK or ROS1 translocations, and we’ve added other mutations or other molecular aberrations to that list, including BRAF, HER2, c-MET, etc. So, the best approach, particularly in a patient who’s not terribly symptomatic and who has the luxury of time of at least waiting for these tests to come back, is to simultaneously do next-generation sequencing for an array of mutation markers, to do FISH specifically for ALK, ROS1, and, to some extent, RET. And now in the face of an approval for immunotherapy up front, specifically pembrolizumab—which has shown superiority to chemotherapy—for individuals with PD-L1 expression 50% or higher, PD-L1 testing is also part of the mix. Now, that’s an IHC test, so we have a mix of tests that we’re doing: next-generation sequencing, FISH, and IHC for PD-L1. So, it’s incumbent on the clinician to make sure we have sufficient tissue to do all these tests, and that’s sometimes the biggest challenge.

Transcript edited for clarity.

August 2016

  • A 51-year-old female presents to her physician with symptoms of fatigue, intermittent chest pain, and lower back pain
  • PMH: hypertension managed on a calcium channel blocker; osteoarthritis
  • No history of smoking
  • CT of the chest showed a 4.5-cm mass in the upper right lobe and enlarged hilar lymph nodes
  • Bronchoscopy and transbronchial lung biopsy were performed:
    • Pathology revealed a grade 2 adenocarcinoma, consistent with a lung primary tumor
    • Molecular testing:
      • FISH: positive for ALK translocation
      • NGS: negative for EGFR, ROS1, RET, BRAF, KRAS
      • IHC: PD-L1 expression in 0% of cells
    • Staging with PET/CT showed 18F-FDG uptake in the lung mass, hilar nodes, and lumbar spine (L4/L5)
    • Brain MRI, negative for intracranial metastases
  • The patient was started on therapy with crizotinib
  • Follow-up imaging at 3 and 6 months showed marked regression of the lung mass, nodal spread, and bone lesions

June 2017

  • After 9 months on crizotinib, the patient reported worsening fatigue and back pain
  • CT showed increased size of the pulmonary mass and bone lesions
  • Brain MRI showed disseminated small lesions
  • Crizotinib was discontinued and the patient was started on brigatinib
Copyright © TargetedOnc 2020 Intellisphere, LLC. All Rights Reserved.