The phrase "a long progression" is correct and usable in written English.
It can be used to describe a gradual development or series of changes over an extended period of time.
Example: "The project involved a long progression of stages, each building on the last to achieve the final outcome."
Alternatives: "an extended development" or "a lengthy evolution."
Rather, their achievement was a vital step in a long progression toward controlled flight.
It's been a long progression, from being an unfit, slightly podgy slacker to where I am now.
The emergence of indie dance music is the most recent step in a long progression of reconciliation between generally divergent worlds.
As David Ludwig, an obesity researcher at Boston Children's Hospital and the author of the book "Always Hungry?," told me in an e-mail, "Type 2 diabetes represents the end of a long progression, beginning with overweight and leading to severe metabolic disease.
There was a long progression that lead to where my work is now.
Type 2 diabetes is characterized by a long progression period before overt disease onset (1, 2).
For the majority of patients, especially the elderly, the aim of therapy should therefore be a long progression-free survival.
Patients with stabilised disease (PR or NC) on initial cisplatin who relapsed after a long progression-free interval have a higher likelihood to respond to second-line paclitaxel and to have longer survival.
A recently performed large randomized study for elderly patients, however, has shown that R-CHOP (rituximab with cyclophosphamide, doxorubicin, vincristine, and prednisone) chemotherapy followed by maintenance rituximab can result in a long progression-free survival.
The median OS in patients with EGFR-mutant advanced NSCLC (represented in strata 3) is about 2 3 years [ 7– 9]; therefore, these patients will have received relatively long-term treatment with EGFR TKIs and achieve a relatively long progression-free period (estimated at 10 months).
Media analyst Claire Enders explains: "The overall long progression over the last 25 years, through a number of phases, into a flourishing production sector has created extraordinarily viable businesses that can actually get an extraordinary change of deal for a programme; an extra £10m a year is an awful lot more.
