NRAS and fibrosarcoma: The responses and reactions of other biomarkers, like BRAF (member of Raf-family (rapidly activated fibrosarcoma)), NRAS (Neuroblastoma viral Ras Oncogene homolog), PIK3CA (Phosphotidyl inositol-4,5-Bisphosphate 3-Kinase Catalytic Subunit Alpha), and exon 20 are currently being studied [39].