However, the use of modern techniques (serum makers of bone damage, circulating tumour cells, functional imaging) may provide non-invasive means of deriving efficacy data from these studies (Tan et al, 2009; Costelloe et al, 2010; Padhani and Koh, 2011).
Whilst adherence to clinical practice guideline recommendations can improve outcome for patients (Goodwin et al. 2009; Nivoli et al. 2011a, b), many of the algorithms for BD patients are derived from efficacy data from randomised controlled clinical trials (RCTs).
Recent research has shown that personality traits change as a result of clinical therapy, although evidence for this effect is derived from efficacy studies that reflect relatively controlled experimental designs.
While the FDA's approval of palifermin in 2004 was limited to only a small percentage of the at-risk population, the fact that the first registered anti-OM agent derived its efficacy from its pleotropic activities was conceptually demonstrative of the therapeutic potential of drugs that selectively interfere with mucositis' pathogenesis.
However, the development of the interventions primarily built on a theoretical rationale derived from efficacy studies.
Recommendations for use in the hospital are usually derived from efficacy tests under practical conditions [ 5].
Despite all the potential limitations of the study, we believe that none should have significantly influenced the derived relative efficacy estimates.
This might indicate that the drugs' distinct side effect profiles derived from efficacy trials are "levelled out" at least to some degree in the naturalistic setting where samples are more heterogeneous and concomitant psychotropics are less restricted.
Thus, there exists a dynamic process in which evidence from both effectiveness and efficacy studies feeds into the development and evaluation of practice guidelines, as depicted in Figure 2. Most practice guidelines are derived from efficacy studies rather than effectiveness studies.
A sit-in derives its efficacy not from merely blocking the door to some objectionable place, but from the public willingness to stand before your neighbours and risk arrest and bodily harm in service of a moral cause, which is itself a force for moral suasion.
