The phrase "a significant stage in" is correct and usable in written English.
It can be used to describe an important phase or milestone in a process, development, or journey.
Example: "The discovery of penicillin was a significant stage in the advancement of modern medicine."
Alternatives: "an important phase in" or "a crucial step in".
A significant stage in the investigation is the interviewing of the officers by the IPCC.
In autumn 1999, the magazine heralded "archaeoraptor" as a significant stage in the evolution of birds from dinosaurs.
This proved a significant stage in the development of library provision.
The creation of FORTRAN, which debuted in 1957, marked a significant stage in the development of computer-programming languages.
It marked a significant stage in the transformation of natural philosophy into physics and its intended audience was enthusiastic: "Read it!
At the same time, a significant stage in Barnes's arduous recovery will be the delivery of his prosthetic legs: not simply objects to him, but vitally important tools for living.
There was a significant stage difference in the percentage presenting with primary operable cancer with good, excellent or moderate prognosis tumours favouring the younger age group and poor prognosis tumours more frequent in the older age group.
The age group represented in this study occupy a significant stage of development in relation to changes in awareness of appearance and as such it is possible the age of the participant could impact upon the outcome of the study.
On a Tuesday night of high drama in the civic chambers, Millwall Football Club won a significant stage victory last week in their attempts to resist Lewisham council's compulsory purchase of land around The Den, a move the club believe will jeopardise their future existence.
Recent research indicates that apoptotic signaling without full progression to apoptosis is a significant stage of regeneration in salamanders.
Today, odanacatib is the only remaining cathepsin K inhibitor that is still at a significant stage of development in osteoporosis.
