The phrase "a primary marker of" is correct and usable in written English.
It can be used to indicate a significant indicator or characteristic of something, often in academic or analytical contexts.
Example: "The presence of certain genetic traits serves as a primary marker of the species' adaptability to environmental changes."
Alternatives: "a key indicator of" or "a main sign of".
As a primary marker of biological activity STAT3 phosphorylation was measured in 29 patients from the Australian trial.
In the Yali tribe, number of pigs is a primary marker of wealth (and hence good nutrition).
What are the mechanisms by which treatment with Se could cause a fall in sFlt-1 concentration, a primary marker of pre-eclampsia risk?
In this respect, although Ki67 is a primary marker of proliferation, it can also be a secondary reflection of cell death (Archer et al, 2003).
Similarly, while C8 is a primary marker of MCAD, it's also a primary marker for GA-II, M/SCHAD and MCKAT.
This is recognized as a primary marker of inflammation and has been found in several studies to be an independent predictor of cancer prognosis [ 7, 8].
The court typically takes up only those questions that have produced contradictory rulings in the lower courts; a "conflict in the circuits" is the primary marker of a case the justices deem worthy of their attention.
A decreased peak VO2 along with a reduced AT has been the primary marker of reduced exercise capacity in patients with cardiovascular limitations to exercise [21].
Because endothelial glycocalyx dysfunction has been associated with acute lung injury in animal models of sepsis [24] and syndecan-1 is a well-documented marker of endothelial injury [37], we selected syndecan-1 as our primary marker of damage to the endothelial glycocalyx.
To complicate the issue further, some individuals and disability organizations reject the notion of disability as the primary marker of personhood.
