Vitrakvi (larotrectinib)

This case provides critical clinical evidence of the "driver versus passenger" phenomenon in precision oncology. It demonstrates that the epigenetic dominance of the SS18::SSX fusion can override the therapeutic relevance of a concurrent NTRK fusion. Our findings serve as a cautionary note: actionable targets detected via next-generation sequencing must be interpreted within the tumor's canonical biological context, as lineage-defining translocations may render secondary kinase alterations therapeutically inert.

Larotrectinib shows meaningful efficacy and favorable tolerance across NTRK fusion-positive malignancies beyond IFS. These real-world data support early molecular testing, highlight histology-dependent outcomes, and inform clinical management strategies.

The patient was treated with temozolomide concurrently with radiotherapy, followed by tumor treating fields with adjuvant temozolomide...Various tyrosine kinase inhibitors, including entrectinib, larotrectinib, repotrectinib, and selitrectinib, along with bevacizumab, were considered to potentially prolong progression-free survival and overall survival and improve quality of life. We expect to highlight the rarity of this case while discussing the effectiveness of second-generation tyrosine kinase inhibitors in high-grade glioblastomas with rare gene fusions. We also hope to identify the appropriate timeline and treatment sequence for post-standard care, given the lack of official guidelines regarding cases this infrequent.

Vignettes explored access to evidence-informed but not universally funded therapies: blinatumomab for low-risk relapse of B-cell acute lymphoblastic leukemia (B-ALL), larotrectinib for TRK-fused soft tissue sarcoma, PBT for unresectable head-and-neck sarcoma, and tisagenlecleucel for first relapse of B-ALL in a patient with Down syndrome. Access to evidence-informed cancer therapies for Canadian children remains variable. Universal funding, simplified approval processes, and the establishment of Canadian PBT centres to reduce travel burden, would ensure timely, equitable access to high-cost therapies.

In this cohort, the DNA+RNA-based panel showed a higher detection rate for TK fusions, although the panels were applied to different patient groups and the sensitivity and specificity could not be determined. Future studies evaluating different test types on the same tumor specimens are warranted to clarify whether the dual-sequencing approaches can improve the identification of actionable genetic events.

P1/2, N=1200, Not yet recruiting, Region Hovedstaden

TRK inhibitors (larotrectinib, entrectinib, repotrectinib) are FDA/EMA-approved for pediatric and adult solid tumors with NTRK fusions and have demonstrated high and durable response rates. The identification of ETV6-NTRK3 provides diagnostic specificity and offers a precision oncology option in the event of relapse. Long-term surveillance and multidisciplinary follow-up remain essential for optimal care.

We present the case of a 4-year-old girl with an LMNA-NTRK1 fusion-positive spindle cell neoplasm initially presenting as a subcutaneous nodule adjacent to purpuric patches on the abdomen. This case highlights an atypical cutaneous presentation of NTRK-RSCNs and demonstrates the successful use of larotrectinib, a TRK inhibitor, in achieving both clinical and histological remission.

This analysis illustrates the diversity of NTRK gene fusion partners across various tumor types and highlights the importance of selecting a pan-tumor fusion-partner agnostic test that can identify both known and novel fusion partners to identify patients who may benefit from treatment with TRK inhibitors.

Comprehensive molecular testing in SGC may allow access to MMT, with a subset of patients experiencing clinical benefit from this strategy.

Targeted therapies with TRK inhibitors (TRKi), including larotrectinib and entrectinib, have shown promising efficacy with rapid and durable responses for patients with LGGs and HGGs. Overall, TRKi represent a significant advance for treating NTRK fusion-positive CNS tumors, especially in pediatric populations, offering new hope for patients with limited treatment options. Further studies are required to optimize their use and address unresolved challenges.

NTRK gene fusions are a critical marker for pediatric soft tissue tumors and are used for precision medicine in these tumors. NTRK gene fusions are used as diagnostic markers for infantile fibrosarcoma, congenital mesoblastic nephroma, and secretory carcinomas, and they play a critical role in the management of these tumors.