The phrase "a combination study" is correct and usable in written English.
It can be used when referring to a research study that combines different methods, approaches, or data sources to achieve a comprehensive understanding of a topic.
Example: "The researchers conducted a combination study that integrated qualitative interviews and quantitative surveys to gather a more complete picture of the participants' experiences."
Alternatives: "a mixed-methods study" or "an integrative study".
(Tian et al. 2009) consider a combination study of two drugs with linear dose-response curves.
We have performed a combination study of the two treatments in the sst2-expressing CA20948 tumor-bearing rat model on which we recently reported the first data [11].
A combination study of experimental measurements and first principles calculation was conducted to advance the understanding of Ti effects on the electrical conductivity behavior in BFCT.
In addition, a combination study (SMART-1) with the alfa blocker tamsulosin has also been conducted (Barkin et al. 2003).
Similar results came from a combination study of oral Panobinostat and Bortezomib (San-Miguel et al. 2009).
The study is still ongoing (Harrison et al. 2008), and a combination study of bortezomib in combination with panobinostat is under evaluation (Siegel et al. 2008).
Assuming a drug combination study reports an actual combinatory effect of E, then the difference (S) between this measured (through experiments or simulation) effect, and the theoretical effect Z indicates the degree of synergy between the two drugs.
They are a combination field trip and social studies lesson in the guise of an afternoon at the arena.
We apply the proposed method to the experimental design for a drug combination study.
A third combination study for the treatment of multiple myeloma focussed on the combination of Panobinostat with Lenalidomide and Dexamethasone (Spencer et al. 2009).
In a drug combination study, resveratrol and quercetin induced apoptosis in HT-29 human colon cancer cells by increasing caspase-3 and poly ADP ribose polymerase (PARP) cleavage.
