Mutational Landscape and Actionable Target Rates on Advanced Stage Refractory Cancer Patients: A Multicenter Chilean Experience.

Major advances in sequencing technologies and targeted therapies have accelerated the incorporation of oncology into the era of precision medicine and "biomarker-driven" treatments. However, the impact of this approach on the everyday clinic has yet to be determined. Most precision oncology reports are based on developed countries and usually involve metastatic, hard-to-treat or incurable cancer patients. Moreover, in many cases race and ethnicity in these studies is commonly unreported and real-world evidence in this topic is scarce. Herein, we report data from a total of 202 Chilean advanced stage refractory cancer patients. Retrospectively, we collected patient data from NGS tests and IHC in order to determine the proportion of patients that would benefit from targeted treatments. Overall >20 tumor types were included in our cohort and 37% of patients (n = 74) displayed potentially actionable alterations, including on-label, off-label and immune checkpoint inhibitor recommendations. Our findings were in-line with previous reports such as the cancer genome atlas (TCGA). To our knowledge, this is the first report of its kind in Latin America delivering real-world evidence to estimate the percentage of refractory tumor patients that might benefit from precision oncology. Although this approach is still in its infancy in Chile, we strongly encourage the implementation of mutational tumor boards in our country in order to provide more therapeutic options for advanced stage refractory patients.

Hipopituitarismo como debut de absceso hipofisiario / Hypopituitarism as debut of pituitary abscess

We present a case of a 20 years old woman who consults for amenorrhea and mild hyperprolactinemia. Within the functional study hypopituitarism was discover and MRI showed a cystic lesion with “ring” enhancement. Transsphenoidal resection was performed, showing purulent material. Cultures were positive for MSSA and Neisseria cinerea. Antibiotic treatment was started completing 21 days. She evolved without relapse but did not recovered pituitary function.

Tratamiento quirúrgico de aneurisma de la arteria espinal posterior roto: reporte de un caso y revisión de la literatura / Surgical treatment of ruptured posterior spinal arteryaneurysm. case report and literature review

Los aneurismas de la arteria espinal posterior (AEP) se presentan en su gran mayoría asociados a patologías que generan aumento del flujo arterial como malformaciones o fístula arteriovenosas y también asociadas a enfermedades del colágeno. Su presentación aislada es rara, con 11 casos publicados en la literatura a nuestro conocimiento. Presentamos una paciente de 56 años de edad, usuaria de anticoagulantes orales por accidente cerebro vascular antiguo no secuelado secundario a fibrilación auricular, que se presenta con dolor lumbar súbito no irradiado, al que luego se agrega paraplejia fláccida. En resonancia nuclear magnética se observa hemorragia subaracnoidea espinal con importante compresión medular secundaria. Estudio con angiografía demostró aneursima de aspecto disecante en arteria espinal posterior. Debido a pequeño calibre de arteria nutricia se optó por tratamiento quirúrgico. Angiografia de control mostró exclusión completa de aneurisma. En los controles posteriores la paciente ha mostrado recuperación progresiva del déficit neurológico. Tanto el tratamiento endovascular como el quirúrgico se han reportado para la exclusión de aneurismas de la AEP. El presente caso muestra que el tratamiento quirúrgico precoz es una alternativa sobre todo si además se requiere realizar descompresión medular.

Aneurysms of the Posterior spinal artery (PSA) usually present secondary to high-flow pathologies such as arteriovenous malformations or dural arteriovenous fistulas, also can be associated whit collagen diseases. Isolate PSA aneurysms are rare, whit 11 cases reported, to our knowledge. We present a 56 years old patient, user of oral anticoagulant for an old isquemic stroke, secondary to atrial fibrillation, who presented whit subit lumbar pain and flaccid paraplejia. The magnetic resonance image shows an extensive spinal subarachnoid hemorrhage and secondary medular compression. Spinal angiography study demonstrated a dissecting aneurysm of PSA. Due to the small size of the artery, on which the aneurysm was located, surgical treatment was performed. Follow up angiography shows complete exclusion of the lesion. The patient has had a progressive recovery on her deficit. Both surgical and endovascular treatment have been reported. The present case shows that early surgical treatment is an option, especially if medular decompression is needed.