ROS1 is a therapeutic target in NSCLC, with gene fusions occurring in 1–2% of patients1,2
Patients with ROS1+ NSCLC require an effective treatment with both systemic and central nervous system (CNS) activity3–6
of patients with ROS1+ NSCLC have CNS metastases at diagnosis3,4
patients CNS is the first and only site of progression3
The most common sites of metastasis for patients with all types of stage IV lung cancer7
(36% for ROS1 + NSCLC)3
Despite advances in therapy for ROS1+ NSCLC, additional treatment options are needed to improve clinical outcomes3
High quality molecular testing, such as FISH and NGS, is needed to confirm patients with actionable ROS1 gene fusions8
- NGS is emerging as a technology with the sensitivity and accuracy necessary to identify all ROS1 fusions with a single test8,12–18
Genetic rearrangements leading to constitutive expression of ROS1 have been identified in a number of tumour types, including NSCLC19–21
In ROS1+ NSCLC, the ROS1 gene undergoes a chromosomal rearrangement, resulting in the fusion of the tyrosine kinase domain of ROS1 with one of several partner proteins21
The resulting ROS1-fusion kinases are constitutively activated to trigger growth and survival signalling pathways that drive cellular proliferation21
CNS, central nervous system; FISH, fluorescence in situ hybridisation; IHC, immunohistochemistry; NGS, next-generation sequencing; NSCLC, non-small cell lung cancer; RT-PCR, reverse transcription polymerase chain reaction.
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