Biological marker, generally refers to a measurable indicator of some biological state or condition. The term occasionally also refers to a substance whose presence indicates the existence of living organisms.

Biomarkers are often measured and evaluated to examine normal biological processes, pathogenic processes, or pharmacologic responses to a therapeutic intervention. Biomarkers are used in many scientific fields.

see Molecular biomarker.

see Biochemical marker.

see Glioblastoma biomarkers.

see Red cell distribution width.

see Tumor marker.

Circulating microRNAs (miRNAs) are a new class of highly promising cancer biomarkers.

It is of great importance to seek further subclassifications in glioblastoma multiforme, biomarkers, and new treatment modalities to make a significant change in survival for individuals ¹⁾.