The phrase 'to be of primary concern' is correct and can be used in written English. This phrase is used to indicate that something is very important and should be given attention before other matters. For example, "Safety must be of primary concern when installing new machinery."
"That is going to be of primary concern to the farmers".
While great improvements have been made, mortality related to congenital cardiac lesions continues to be of primary concern.
Furthermore, barriers related to a lack of integration into daily practice seem to be of primary concern, suggesting that increasing the system's flexibility and learning capacity in order to be able to adapt the decision support to meet the varying needs of different users should be the main target of CDSS interventions.
Since the kernel is the key element in the SPH methodology, this should be of primary concern to any user of SPH.
In devising a policy and practice strategy to address the projected increase in the reentry population, leadership within communities for social and supportive services to ex-prisoners, specifically treatment services should be of primary concern.
Any potential downgrade would be of primary concern for localities that are planning to finance public-works projects.
Infection is a major issue in surgery, and should be of primary concern when engineering biomaterials.
Thus in vibration analysis of a plane frame, the out-of-plane vibration should be of primary concern in practice.
Pathogen removal has very rarely been considered as an objective but for reuse of effluents in agriculture, this must be of primary concern.
Removing the source of lead should be of primary concern, but nutrition is important, too.
Since the bank had been found to be of "primary money-laundering concern," the Treasury Department could turn it into an international pariah by forbidding American financial institutions to deal with it.
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK