Is genetic testing required before using larotinib/larlotinib?

Genetic testing is necessary before treatment with larotrectinib because this drug specifically targets tumors that are positive for NTRK gene fusions. NTRK (neurotrophic factor receptor tyrosine kinase) gene fusions are rare genetic abnormalities that can drive tumor growth, but not all patients with solid tumors carry this mutation. Therefore, before using larotrectinib, it is necessary to confirm whether the patient belongs to the eligible population to avoid ineffective treatment.

Currently, NTRK gene fusion detection methods mainly include NGS (next generation sequencing technology), FISH (fluorescence in situ hybridization) and PCR (polymerase chain reaction). Among them, NGS testing can comprehensively screen for multiple gene mutations and is the most commonly used method, while FISH and PCR are more suitable for single-gene targeted testing. If the patient's genetic test results show a positive NTRK fusion mutation, larotrectinib treatment can be considered.

Genetic testing can not only help select patients suitable for larotrectinib, but can also avoid the blind use of expensive targeted drugs and reduce unnecessary financial burdens. In addition, some tumor patients may carry other gene mutations, such as EGFR, ALK, ROS1, etc. For different mutation types, corresponding targeted drugs need to be selected instead of larotrectinib. Therefore, the results of genetic testing are crucial for formulating precise treatment plans.

In addition, genetic testing can also help doctors predict patients' tolerance to larotrectinib and possible resistance mechanisms. During long-term treatment, some patients may develop drug resistance due to further evolution of genetic mutations. At this time, it is necessary to re-evaluate the genetic status and consider changing treatment options. Therefore, genetic testing is not only crucial before treatment, but should also be monitored regularly during treatment to optimize treatment effects.

Reference materials:https://www.vitrakvi.com/