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66
endometriosis is more
effective than placebo at
reducing pain and
improving quality of life
QOL was noted after
surgery without
differences between short
and long term
dysmenorrhoea and
quality of life as well as
patient satisfaction were
comparable in the medium
term
signicant improvement
on condition-specic
quality of life outcomes at
6 weeks and 6 months
signicant difference for
mid-term functional
A. A. Samara
digestive and urinary
outcomes in patients with
large involvement of the
rectum
Number of
patients QoL instrument Follow up Conclusion regarding QoL
39 EQ-5D and SF-12 12 months Laparoscopic excision of
Laparoscopic excision of
endometriosis vs.
endometriosis
placebo
52 SF-36 51 months Persistent improvement in
laparoscopically assisted
to open colorectal
resection
colorectal
endometriosis
2014 Surgical excision of
62 SF-36 12 months Improvement in
Laparoscopic
hysterectomy vs.
laparoscopic
dysmenorrhea
73 SF-12 6 months Both groups reported
supracervical
hysterectomy
Robotic vs. laparoscopic
60 GIQLI, SF-36 24 months There is no statistically
surgery for endometriosis
endometriosis
Conservative surgery vs.
radical rectal surgery for
deeply invasive
deep rectal
endometriosis
endometriosis involving
the rectum
Table 5.4 RCTs in gynecological surgery
Author Year Operation Comparison
Abbott etal. [67] 2004 Surgical excision of
Touboul etal.
[68]
Berner etal. [69] 2015 Surgical treatment of
Soto etal. [70] 2017 Surgical excision of
Roman etal. [71] 2018 Surgical excision of

5 Quality ofLife asEndpoint inSurgical Randomised Controlled Trials
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higher and disease-free
survival is lower for
minimally invasive radical
hysterectomy than for
open surgery, and
postoperative quality of
life is similar between the
treatment groups
baseline during early and
later phases of recovery,
and the adverse event
prole, favour TLH
compared with TAH for
treatment of stage I
endometrial cancer
6 months Recurrence rates are
EuroQoL-5D,
MDASI
67
631 SF-12, FACT-Cx,
Μinimally invasive vs.
open radical
hysterectomy for cervical
cancer
cancer
2020 Surgery for cervical
361 FACT-G 6 months QoL improvements from
Total laparoscopic
hysterectomy (TLH) vs.
total abdominal
hysterectomy (TAH)
endometrial cancer
Frumovitz etal.
[72]
Janda etal. [73] 2010 Surgery for stage I
EQ-5D European Quality of Life–5 Dimensions instrument, SF-12 Short-Form 12, SF-36 Short-Form 36, GIQLI Gastrointestinal Quality of Life Index, FACT-Cx Functional
Assessment of Cancer Therapy-Cervical, MDASI MD Anderson Symptom Inventory, FACT-G Functional Assessment of Cancer Therapy-General

68
A. A. Samara
Discussion
Traditionally, morbidity and mortality following
an operation have been the parameters applied to
assess clinical outcomes of different surgical
interventions. Moreover, economic outcomes
including hospital charges and length of stay
have also been used [74]. A primary reason for
patients to seek surgical advice and care is an
impaired quality of life [75]. Following the development of patients’ rights movements, quality of
life became a principal endpoint in health care
research [76]. From the negative health measures
like the “ve D’s” (death, disease, disability, discomfort, and dissatisfaction), research interest
has shifted towards the assessment of more positive dimensions with the purpose of evaluating
health and not disease [76]. Data regarding
Health-related Quality of Life (HR-QoL) can be
used to adapt treatments and improve clinical
outcomes by detecting physical or psychological
disabilities in patients that may otherwise be
overlooked [74].
Several tools have been used to calculate QoL
in both a generic or specic manner. In general,
QoL measures are based on questionnaires that
must be short and easy to answer [76]. HR-QoL
instruments must satisfy 3 critical measurement
properties: reliability, validity and responsiveness [75]. The Short Form-36 (SF-36) and
EORTC (European Organization for Research
and Treatment of Cancer) QLQ-C30 are examples of widely used and validated generic QoL
instruments. QLQ-C30 is the most widely used
disease-specic instrument for the assessment of
QOL in cancer patients worldwide [74].
While in the last decade indicate that the
Royal College of Surgeons supports and encourages RCT use for evaluating surgical interventions, until recently only a few surgical trials
were identied in the worldwide literature [77].
ProtecT [78] (Prostate testing for cancer and
Treatment) and ROSSINI [79] (Reduction of
Surgical Site Infection using a Novel Intervention)
are excellent examples demonstrating how RCTs
in surgery can be successfully conducted and
overcome the specic difculties associated with
surgical RCTs such as randomisation between
surgical and non-surgical interventions, recruiting patients on an emergency basis, and collecting data from multiple centres [77].
During the past two decades as reported in our
results, several studies were published with
HR-QoL as an endpoint comparing operative
versus non-operative management, or comparing
different surgical approaches and techniques.
Randomised controlled trials have been conducted in almost every surgical specialty—
including trials for coronary revascularization
surgery, colorectal and gastrointestinal surgery
and gynecology surgery—to compare and examine surgical techniques while questioning the
value of surgical intervention. However, the total
number of RCTs in surgery remains minimal,
with recruitment tending to be lower compared
with medical RCTs [77].
Randomization minimizes differences
between treatment groups during recruitment for
the trial, however it cannot prevent differential
treatment between groups later in the trial or differential assessment of outcomes which result in
systematic bias [80]. Blinding as many individuals as possible in a trial is the optimal strategy to
minimize the likelihood of differential treatment
or assessments of outcomes [80]. Applying
blinding techniques to randomised controlled
trials of surgical interventions is more challenging than medical RCTs where placebos are typically used. Although surgeons can rarely be
blinded, it may be possible for researchers to
blind other treatment team members and thus
limit the potential for differential treatment. A
novel blinding technique must include three
qualities: it must successfully conceal the group
allocation; it must not impair the ability to accurately assess outcomes; and it must be acceptable to individuals that will be assessing
outcomes [80, 81]. In a systematic review of all
trials in orthopedic trauma over 10 years,
researchers determined that over 85% of trials
could have blinded at least some of the individuals assessing outcomes [82].
A well-designed RCT has high internal validity and acceptable external validity (generalizability). Findings from small, underpowered and
poorly designed surgical RCTs may be overval-

5 Quality ofLife asEndpoint inSurgical Randomised Controlled Trials
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69
ued because their design provides them with
unwarranted credibility [17]. In reality, RCTs
and observational studies contribute complementary evidence. Although non-RCTs or observational designs lack the validity of randomisation
to control for selection bias, other principles of
high-quality methodology such as blinding,
intention-to-treat analysis, and complete follow up applied for the design of an RCT should be
adopted to improve the quality of observational
studies [83]. Solomon etal. performed a systematic review of treatment evaluation questions and
concluded that only 40% of treatment questions
involving surgical procedures could have been
evaluated by an RCT [84].
RCTs in surgery typically have lower internal
validity compared to medical RCTs, as they are
dependent on the abilities of participating surgeons [83]. Both training and experience are
required to develop expertise in a surgical procedure, and learning curves exist even for fully
trained surgeons [85]. Failure to control for the
learning curve in a trial may underestimate the
novel intervention’s treatment effect [86].
Approaches to minimize the effect of the learning
curve include: a prespecied number of cases
during the surgeon’s life-time; the number of
cases in the year preceding the trial; general
training in the area; and outcomes consistent with
good clinical practice [85].
In a systematic review for comparative clinical trials investigating the effectiveness of a surgical or minimally invasive procedure, Wenner
etal., reported that a very low proportion of studies (7.6%) met the minimal design attributes of
inclusion criteria [86]. This may indicate the
many barriers to conducting well-designed comparative trials of surgical procedures, such as the
relatively high cost associated and correspondingly limited funding for non-device surgical trials, or difculties recruiting patients to
randomised trials of operations [86]. On the contrary, a systematic review by Walter et al. concluded that there was no difference regarding the
reported quality of surgical trials compared to
non-surgical trials; however, approximately half
or fewer of all the trials had adequate methodology [87].
There is a pressing need to standardize endpoints in perioperative clinical trials and to agree
on a core data set that is common to all trials.
Standardizing endpoints are necessary components of evidence-based practice that will
improve the validity of pooled analysis of clinical
trials [88]. Comparison between studies is made
easier, and other investigators will have a stronger foundation on which to design future, denitive trials [88, 89]. Primary endpoints in clinical
trials must be clinically relevant, sensitive to
treatment effect, measurable and interpretable,
while secondary endpoints could provide a more
global view of the benet of the treatment [90].
Regarding quality-of-life research, RCT’s
focused on HRQL as their primary outcome were
more likely to be of better quality than other studies, which provide their HRQL ndings alongside the main clinical outcomes [91, 92].
In recently published studies, preoperative
HR-QoL has been associated with the presence
of postoperative complications and even with
cancer stage in the time of diagnosis [93–96].
Based on these ndings, assessment of preoperative HR-QoL can guide decision making regarding the optimal therapeutic option and
minimalizing the possibility of complications for
every patient.
Conclusion (Fig.5.2)
During the two last decades, randomized controlled trials have been conducted in almost every
surgical specialty—including trials for coronary
revascularization surgery, colorectal and gastrointestinal surgery and gynecology surgery—to
compare and examine surgical techniques while
questioning the value of surgical intervention.
RCT’s focused on HRQL as their primary outcome were more likely to be of better quality
than studies providing HRQL ndings alongside
the main clinical outcomes. Conducting a welldesigned, high-quality RCT can be a challenge
which may be the primary reason for the low
number of RCTs in surgery. Future research and
clinical trials in surgery should routinely include
analysis of QoL as an outcome measure.

70
Following the development of patients’ rights movements, quality of life became a principal endpoint in health care research
RCTs have been conducted in almost every surgical specialty - including trials for coronary revascularization surgery, colorectal
and gastrointestinal surgery and gynecology surgery — to compare and examine surgical techniques while questioning the value
of surgical intervention.
RCTs in surgery have lower internal validity compared to medical RCTs, as they are dependent on the abilities of participating
surgeons.
Conducting a well-designed, high-quality RCT can be a challenge which may be the primary reason for the low number of RCTs
in surgery
RCT’s focused on HRQL as their primary outcome were more likely to be of better quality than studies providing HRQL findings
alongside the main clinical outcomes
Future research and clinical trials in surgery should routinely include analysis of QoL as an outcome measure.
A. A. Samara
Fig. 5.2 Highlighted conclusions. Abbreviations: RCTs Randomized-Controlled Trials
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