The Effects of Light Therapy to Treat Cancer-related Side Effects
NCT04418856, Not applicable, Completed, Reykjavik University
Trial 10
As registered on ClinicalTrials.gov, in the graph's capture of the registry.
| Field | Value | Source |
|---|---|---|
| Title | The Effects of Light Therapy to Treat Cancer-related Side Effects | ClinicalTrials.gov |
| NCT number | NCT04418856 | ClinicalTrials.gov |
| Status | Completed | ClinicalTrials.gov |
| Phases | Not applicable | ClinicalTrials.gov |
| Enrollment | 260 participants, actual | ClinicalTrials.gov |
| Lead sponsor | Reykjavik University | ClinicalTrials.gov |
| Conditions | Breast Cancer, Circadian Rhythms, Fatigue, Sleep Disturbance, Cognitive Impairment, Inflammatory Response, Depression | ClinicalTrials.gov |
| Interventions | Light Glasses (Experimental), Light Glasses (Comparison) | ClinicalTrials.gov |
| First posted | 2020-06-05 | ClinicalTrials.gov |
| Last updated | 2026-06-02 | ClinicalTrials.gov |
Registered outcomes 35
Each outcome the trial registered, primary first, in ClinicalTrials.gov's words.
| List | Outcome | Time frame | Description | Source |
|---|---|---|---|---|
| Primary | FACIT-Fatigue Scale | Up to 14 months | The FACIT-Fatigue Scale is an outcome measure of fatigue consisting of 13 items on a four point Likert scale about fatigue levels during usual daily activities over the past 7 days. The scale has excellent test-retest reliability (r = 0.90) and internal consistency reliability (α= 0.93-0.95). | ClinicalTrials.gov |
| Primary | Pittsburgh Sleep Quality Index | Up to 14 months | The Pittsburgh Sleep Quality Index assesses sleep quality. The scale consists of 19 self-rated items, divided into seven components. The scores ranges from 0-21, with lower scores indicating better sleep quality. The scale has the test-retest reliability of r=.85 and estimated internal consistency of α=.80. | ClinicalTrials.gov |
| Primary | The Center for Epidemiological Studies Depression Scale | Up to 14 months | The Center for Epidemiological Studies Depression Scale (CES-D) measures depression symptoms. The 20 items scores range from 0 - 60, with higher scores indicating greater depressive symptoms. Internal consistency for women undergoing breast cancer treatment is estimated to be α=.89 and α=.90 for healthy comparison group. | ClinicalTrials.gov |
| Primary | PROMIS cognitive function and cognitive abilities | Up to 14 months | PROMIS® (Patient-Reported Outcomes Measurement Information System) cognitive function and cognitive abilities 8a consist of 8 self-report item rated on a five point Likert scale ranging from "never" to "very often" on the Cognitive Function scale and "not at all" to "very much" on the Cognitive Abilities scale. Both PROMIS item banks show good psychometric properties, such as a high internal consistency (α =.94 for each). | ClinicalTrials.gov |
| Primary | The Rey 15-Item Memory Test | Up to 14 months | The Rey 15-Item Memory Test evaluates short-term memory along with long-term memory. The test consists of series of 15 common words and the subject freely expressing the words retained. Afterward, another list of 15 unrelated words are given and the task of the subject is to repeat the original list of 15 words and then to repeat it after 30 minutes. RAVLT has good internal consistency (α=.80) and adequate convergent and divergent validity. | ClinicalTrials.gov |
| Primary | The Digit Span test | Up to 14 months | The Digit Span test assesses working memory and immediate auditory recall. It is a part of the Wechsler Adult Intelligence Scale - Fourth Edition (WAIS-IV). The test has two subsections: Digits forwards and Digits backwards, each containing eight items. The task of the participants is to repeat the sequence of numbers the examiner reads for them, either repeat exactly what the examiner said or reverse it. Its reliability and validity is considered to be good, with internal consistency of 0.79, test-retest reliability of 0.77 and split-half reliability of 0.88. | ClinicalTrials.gov |
| Primary | The Stroop task | Up to 14 months | The Stroop task assesses selective attention, or the ability of the participant to block out irrelevant stimuli. The first subtask consists of reading color names (yellow, red, green and blue) written in black ink as fast as possible, in order to measure the reading and psychomotor speed of the participants. The second subtask consists of naming colored pads and in the third subtask the participants say the font color in which the color names are written in, which do not necessarily match. Stroop has been found to be stable across the one- and two week period with a test-retest coefficient of 0.83 for the Word task, 0.74 for the Color task and 0.67 for the Color Word task. | ClinicalTrials.gov |
| Primary | The Trail Making test | Up to 14 months | The Trail Making Test (TMT) consists of two parts: TMT A and B. TMT A measures visual search and psychomotor speed, whereas TMT B measures divided attention, cognitive flexibility and working memory. In TMT A, the task of the participants is to draw a line as quickly as they can between 25 circles in the correct order without lifting their pencil, with each circle containing a number from 1-25 presented in an random array. In TMT B, the task of the participants is to draw a line between randomly arranged encircled numbers from 1 to 13 and letters from A to L, in the correct sequence while alternating between letters and numbers, as quickly and accurately as they can. Test-retest reliability of 0.79 has been found for part A and 0.89 for part B. | ClinicalTrials.gov |
| Primary | Psychomotor Vigilance task | Up to 14 months | Psychomotor vigilance task (PVT) measures alertness and vigilant attention and is considered to be the gold standard measure of neurobehavioral effects of circadian misalignment and sleep loss. In PVT participants are instructed to attend to a red rectangular box on a computer screen and to respond to a yellow stimulus counter inside the box. PVT gives information about accuracy and reaction time. The test has shown good psychometric properties, such as high reliability, with intra-class correlations assessing test-retest reliability above 0.8. | ClinicalTrials.gov |
| Primary | The automated Operation Span task | Up to 14 months | The automated operation span task (aOSPAN) measures working memory span and consists of solving math operations while remembering a set of letters in the correct order, in set sizes ranging from 2 to 5. The task starts with three practice trials. The aOSPAN gives information about accuracy and reaction time. AOSPAN has shown to be reliable across sessions (.83) and to load highly on the working memory capacity factor (.68). | ClinicalTrials.gov |
| Primary | The Word Fluency Test | Up to 14 months | The Word Fluency test measures executive functioning and semantic abilities of the participants. This test is the Icelandic equivalent of the standard F-A-S test, employing the letters H and S since they are the most frequent letters in Icelandic. The initial part of the test consists of phonemic fluency tasks where the participants say as many words beginning with the letter H as fast as they possibly can in one minute, followed by the letter S. The latter part of the test measures semantic fluency where the participants are instructed to do the same but with animal names. The test has shown good internal consistency (α=.83) and test-retest reliability of .74. | ClinicalTrials.gov |
| Secondary | Salivary Cortisol | Up to 14 months | Salivary Cortisol: A commercial chemiluminescence immunoassay (CLIA) will be used to analyze the saliva samples, with a lower detection limit of 0.41 nmol/L. Inter- and intra-assay coefficients of variance are \<10% across the expected range of cortisol levels. The following parameters will be calculated and used in analyses: 1) the cortisol awakening response (the rise in cortisol from waking to 30 minutes post-waking), 2) nocturnal cortisol, and 3) the diurnal cortisol slope. | ClinicalTrials.gov |
| Secondary | Urinary Melatonin | Up to 14 months | Production of pineal melatonin can be inferred from urinary 6 sulfatoxymelatonin (major metabolite of melatonin in urine). Urinary aMT6s (ng/mg Creatinine) will be measured by a competitive ELISA kit. Total excretion of aMT6s is calculated by multiplying the assayed concentration by the volume of urine voided. The aMT6s profiles will be analyzed using cosinor analysis, which is based on the least square approximation of the time series using a cosine function with a period of 24 h. The following parameters will be calculated: 1) acrophase time: time of the peak aMT6s concentration; 2) mesor: mean aMT6s value for all the samples included in the cosinor analysis and 3) amplitude: difference between the mesor and the peak aMT6s level. | ClinicalTrials.gov |
| Secondary | Circadian Activity Rhythms | Up to 14 months | Circadian Activity Rhythms (CAR) will be recorded with a wrist actigraphy or ActTrust. ActTrust generates the the following three CAR parameters: 1) Amplitude (peak or maximum of the curve, with a lower amplitude indicating a less rhythmic rhythm); 2) Acrophase (time of day of the peak activity, with a later time indicating more phase-delay); and 3) Mesor (half-way between minimum and maximum of the curve, a circadian rhythm-adjusted mean of the daily activity). | ClinicalTrials.gov |
| Secondary | Connor-Davidson Resilience Scale | Up to 14 months | Connor-Davidson Resilience Scale (CD-RISC-10) is a 10 item ordinal scale rated on a 5-point (0-4) scale with higher scores reflecting greater resilience. It is meant to measure one's ability to "bounce-back" and propensity for adaptability. The scale has excellent Internal Consistency, α=.85. | ClinicalTrials.gov |
| Secondary | Positive and Negative Affect Schedule | Up to 14 months | Positive and Negative Affect Schedule (I-PANAS-SF) shorter version is a self-report affect scale that measures positive and negative feelings on a 5-point Likert scale, consisting of five positive stated and five negative stated questions, in total 10 questions. The scale has good internal reliability, or α=.82. | ClinicalTrials.gov |
| Secondary | The Credibility/Expectation Questionnaire | Up to 14 months | The Credibility/Expectation Questionnaire (CEQ) consists of 5 items listed on a 10-point self-report scale that measures treatment credibility and expectancy in clinical outcome studies. The scale has high internal consistency within the two factors, credibility α=.81 and expectation α=.90, and good test-retest reliability. | ClinicalTrials.gov |
| Secondary | Godin-Shephard Leisure-Time Physical Activity Questionnaire | Up to 14 months | Godin-Shephard Leisure-Time Physical Activity Questionnaire (GSLTPAQ)/Godin-Shephard Leisure-Time Exercise Questionnaire (GLTEQ) consists of three self-report questions were respondents rates their weekly leisure activity, such as how often and how strenuous they typically exercise. The leisure score index is obtained by the multiplying the frequency of each score with a corresponding Metabolic Equivalent of Task (MET) value, dividing the total score in three categories: active (24 units or more), moderately active (14 to 23 units) and less substantial or low benefits (14 units or less). | ClinicalTrials.gov |
| Secondary | The reduced Horne & Östberg Morningness-Eveningness Questionnaire | Up to 14 months | The reduced Horne \& Östberg Morningness-Eveningness Questionnaire (rMEQ) is a self-report questionnaire consisting of 5 questions that assess chronotypes, where a higher score suggests a morningness chronotype. Its internal consistency has been estimated to be α=.69 - .78. | ClinicalTrials.gov |
| Secondary | Severity of cancer symptoms | Up to 14 months | MD Anderson Symptom Inventory (MDASI) is a symptom-specific patient-reported outcome instrument that consists of 19 questions developed to direct access symptoms experienced by cancer patients and how much they interfere with daily living. The inventory has a good internal consistency and test-retest reliability of α= ≥ .84 and intraclass correlation for all subscales ≥ .76. | ClinicalTrials.gov |
Outcomes 0
Each outcome the trial posted results for, in ClinicalTrials.gov's words.
| Type | Outcome | Time frame | Population | Units | Measured as | Source |
|---|
Results by group 0
Each measurement the trial posted, group by group, in the words and numbers it posted.
| Outcome | Group | Category | Value | Spread | Units | Source |
|---|
Participant flow 0
How many started, completed or left each group, period by period.
| Period | Milestone | Group | Participants | Units counted | Source |
|---|
Adverse events 0
Each adverse event the trial posted, group by group: the participants affected out of those at risk.
| Type | Event | Organ system | Group | Affected | At risk | Events | Source |
|---|
Adverse event totals 0
The totals the trial posted for each group.
| Total | Group | Affected | At risk | Source |
|---|
Papers 6
The papers the trial lists on ClinicalTrials.gov.
Trial comparisons 0
Comparisons of the trial's two groups, calculated by ConductScience from the counts it posted.
| Comparison | Source |
|---|
Tests 8
The ConductCognition tests this trial's registered outcomes name, as ScienceGraph matched them in trial-tests-2026-11-12-0.2.1.
| Test | Named as | Source |
|---|---|---|
| Category Fluency | Primary outcome | ConductCognition |
| Digit Span Test | Primary outcome | ConductCognition |
| Operation Span | Primary outcome | ConductCognition |
| Psychomotor Vigilance Task | Primary outcome | ConductCognition |
| Stroop Color-Word Test | Primary outcome | ConductCognition |
| Trail Making Test A | Primary outcome | ConductCognition |
| Trail Making Test B | Primary outcome | ConductCognition |
| Verbal Fluency | Primary outcome | ConductCognition |
Source 4
| Field | Value | Source |
|---|---|---|
| Release | trials-2026-11-12-0.3.0 | ClinicalTrials.gov |
| Release manifest SHA-256 | 4a570df2e7274cee2d4fa2959402fab41880e2cd412e4b590390035fbea69391 | ClinicalTrials.gov |
| Registry capture | 2026-11-12 | ClinicalTrials.gov |
| Results copy, AACT | 2026-03-23 | ClinicalTrials.gov |
Release trials-2026-11-12-0.3.0
ClinicalTrials.gov's posted results, through CTTI's AACT: ClinicalTrials.gov data via Aggregate Analysis of ClinicalTrials.gov (AACT), CTTI. CTTI makes its materials freely available and requests acknowledgement. https://aact.ctti-clinicaltrials.org/documentation/299 ClinicalTrials.gov's data carry an international copyright outside the United States: https://clinicaltrials.gov/about-site/terms-conditions.
ClinicalTrials.gov: none stated ClinicalTrials.gov's data carry an international copyright outside the United States: https://clinicaltrials.gov/about-site/terms-conditions.