Long-term cognitive function following chemotherapy in patients with testicular cancer

Cognitive function in long-term testicular cancer survivors: impact of modifiable factors

No study has comprehensively examined associated factors (adverse health outcomes, health behaviors, and demographics) affecting cognitive function in long-term testicular cancer survivors (TC survivors). TC survivors given cisplatin-based chemotherapy completed comprehensive, validated surveys, including those that assessed cognition. Medical record abstraction provided cancer and treatment history. Multivariable logistic regression examined relationships between potential associated factors and cognitive impairment. Among 678 TC survivors (median age = 46; interquartile range [IQR] = 38-54); median time since chemotherapy = 10.9 years, IQR = 7.9-15.9), 13.7% reported cognitive dysfunction. Hearing loss (odds ratio [OR] = 2.02; P = .040), neuropathic pain (OR = 2.06; P = .028), fatigue (OR = 6.11; P < .001), and anxiety/depression (OR = 1.96; P = .029) were associated with cognitive impairment in multivariable analyses. Being on disability (OR = 9.57; P = .002) or retired (OR = 3.64; P = .029) were also associated with cognitive decline. Factors associated with impaired cognition identify TC survivors requiring closer monitoring, counseling, and focused interventions. Hearing loss, neuropathic pain, fatigue, and anxiety/depression constitute potential targets for prevention or reduction of cognitive impairment in long-term TC survivors.

Long-Term Cognitive Dysfunction in Cancer Survivors

Cancer-related cognitive impairment (CRCI) is a frequent side effect experienced by an increasing number of cancer survivors with a significant impact on their quality of life. Different definitions and means of evaluation have been used in available literature; hence the exact incidence of CRCI remains unknown. CRCI can be described as cognitive symptoms reported by cancer patients in self-reported questionnaires or as cognitive changes evaluated by formal neuropsychological tests. Nevertheless, association between cognitive symptoms and objectively assessed cognitive changes is relatively weak or absent. Studies have focused especially on breast cancer patients, but CRCI has been reported in multiple types of cancer, including colorectal, lung, ovarian, prostate, testicular cancer and hematological malignancies. While CRCI has been associated with various treatment modalities, including radiotherapy, chemotherapy, hormone therapy and novel systemic therapies, it has been also detected prior to cancer treatment. Therefore, the effects of cancer itself with or without the psychological distress may be involved in the pathogenesis of CRCI as a result of altered coping mechanisms after cancer diagnosis. The development of CRCI is probably multifactorial and the exact mechanisms are currently not completely understood. Possible risk factors include administered treatment, genetic predisposition, age and psychological factors such as anxiety, depression or fatigue. Multiple mechanisms are suggested to be responsible for CRCI, including direct neurotoxic injury of systemic treatment and radiation while other indirect contributing mechanisms are hypothesized. Chronic neuroinflammation mediated by active innate immune system, DNA-damage or endothelial dysfunction is hypothesized to be a central mechanism of CRCI pathogenesis. There is increasing evidence of potential plasma (e.g., damage associated molecular patterns, inflammatory components, circulating microRNAs, exosomes, short-chain fatty acids, and others), cerebrospinal fluid and radiological biomarkers of cognitive dysfunction in cancer patients. Discovery of biomarkers of cognitive impairment is crucial for early identification of cancer patients at increased risk for the development of CRCI or development of treatment strategies to lower the burden of CRCI on long-term quality of life. This review summarizes current literature on CRCI with a focus on long-term effects of different cancer treatments, possible risk factors, mechanisms and promising biomarkers.

Four decades of chemotherapy-induced cognitive dysfunction: comprehensive review of clinical, animal and in vitro studies, and insights of key initiating events

Cognitive dysfunction has been one of the most reported and studied adverse effects of cancer treatment, but, for many years, it was overlooked by the medical community. Nevertheless, the medical and scientific communities have now recognized that the cognitive deficits caused by chemotherapy have a strong impact on the morbidity of cancer treated patients. In fact, chemotherapy-induced cognitive dysfunction or 'chemobrain'  (also named also chemofog) is at present a well-recognized effect of chemotherapy that could affect up to 78% of treated patients. Nonetheless, its underlying neurotoxic mechanism is still not fully elucidated. Therefore, this work aimed to provide a comprehensive review using PubMed as a database to assess the studies published on the field and, therefore, highlight the clinical manifestations of chemobrain and the putative neurotoxicity mechanisms.In the last two decades, a great number of papers was published on the topic, mainly with clinical observations. Chemotherapy-treated patients showed that the cognitive domains most often impaired were verbal memory, psychomotor function, visual memory, visuospatial and verbal learning, memory function and attention. Chemotherapy alters the brain's metabolism, white and grey matter and functional connectivity of brain areas. Several mechanisms have been proposed to cause chemobrain but increase of proinflammatory cytokines with oxidative stress seem more relevant, not excluding the action on neurotransmission and cellular death or impaired hippocampal neurogenesis. The interplay between these mechanisms and susceptible factors makes the clinical management of chemobrain even more difficult. New studies, mainly referring to the underlying mechanisms of chemobrain and protective measures, are important in the future, as it is expected that chemobrain will have more clinical impact in the coming years, since the number of cancer survivors is steadily increasing.

Cognitive impairment and associations with structural brain networks, endocrine status, and risk genotypes in newly orchiectomized testicular cancer patients

A higher incidence of cognitive impairment (CI) has previously been reported among orchiectomized testicular cancer patients (TCPs), but little is known about the underlying pathophysiology. The present study assessed CI in newly orchiectomized TCPs and explored the structural brain networks, endocrine status, and selected genotypes. Forty TCPs and 22 healthy controls (HCs) underwent neuropsychological testing and magnetic resonance imaging, and provided a blood sample. CI was defined as a z-score ≤ -2 on one neuropsychological test or ≤ -1.5 on two neuropsychological tests, and structural brain networks were investigated using graph theory. Associations of cognitive performance with brain networks, endocrine status (including testosterone levels and androgen receptor CAG repeat length), and genotypes (APOE, BDNF, COMT) were explored. Compared with HCs, TCPs performed poorer on 6 out of 15 neuropsychological tests, of which three tests remained statistically significant when adjusted for relevant between-group differences (p < 0.05). TCPs also demonstrated more CI than HCs (65% vs. 36%; p = 0.04). While global brain network analysis revealed no between-group differences, regional analysis indicated differences in node degree and betweenness centrality in several regions (p < 0.05), which was inconsistently associated with cognitive performance. In TCPs, CAG repeat length was positively correlated with delayed memory performance (r = 0.36; p = 0.02). A COMT group × genotype interaction effect was found for overall cognitive performance in TCPs, with risk carriers performing worse (p = 0.01). No effects were found for APOE, BDNF, or testosterone levels. In conclusion, our results support previous findings of a high incidence of CI in newly orchiectomized TCPs and provide novel insights into possible mechanisms.

Transient effects of chemotherapy for testicular cancer on mouse behaviour

The treatment of testicular cancer includes unilateral orchiectomy and chemotherapy and is curative for most patients. However, observational studies revealed an association with depression, anxiety and cognitive impairment. It is unclear whether these side effects are caused by chemotherapy, hemicastration or the disease itself. The aim of our study was to analyse the behavioural effects of hemicastration and chemotherapy in adult male mice. The animals were randomly divided into four groups – control, chemotherapy, hemicastration and hemicastration with chemotherapy. After chemotherapy that included three cycles of bleomycin, etoposide, cisplatin mice underwent a battery of behavioural tests. To assess the long-term effects animals were tested also 3 months after the end of treatment. Chemotherapy led to lower locomotor- and exploratory activity, higher anxiety-like behaviour and worse spatial memory immediately after treatment. These behavioural effects were not present three months later. Hemicastration had no effect on most of the observed outcomes. In conclusion, adverse behavioural effects induced by chemotherapy in mice are transient and disappear later in life. Further studies are needed to elucidate the mechanisms responsible for the observed effects.

Early ageing after cytotoxic treatment for testicular cancer and cellular senescence: Time to act

Treatment of testicular cancer (TC) has an exceptionally high success rate compared to other cancer types; even in case of metastasized disease, 80-90 % of TC patients can be cured. Consequently, attention has been drawn to a potential downside of this treatment success: late adverse treatment effects such as the accelerated development of otherwise age-associated features like cardiovascular disease and second malignancies. Underlying mechanisms are poorly understood. Emerging data suggest that cytotoxic treatment induces cellular senescence, resulting in secretion of inflammatory factors contributing to this early ageing phenotype. Molecular and cellular characterization of this early ageing will enhance understanding the pathogenesis of TC treatment-induced morbidity and contribute to better recognition and prevention of late effects. In this review, we describe clinical manifestations of the early ageing phenotype among TC survivors, and subsequently focus on potential underlying mechanisms. We discuss the clinical implications and describe perspectives for future research and intervention strategies.

Overview of cisplatin-induced neurotoxicity and ototoxicity, and the protective agents

Cisplatin has dramatically improved the survival rate of cancer patients, but it has also increased the prevalence of hearing and neurological deficits in this population. Cisplatin induces ototoxicity, peripheral (most prevalent) and central (rare) neurotoxicity. This review addresses the ototoxicity and the neurotoxicity associated with cisplatin-based chemotherapy, providing an integrated view of the potential protective agents that have been evaluated in vitro, in vivo and in clinical trials, their targets and mechanisms of protection and their effects on the antitumor activity of cisplatin. So far, the findings are insufficient to support the use of any oto- or neuroprotective agent before, during or after cisplatin chemotherapy. Despite their promising effects in vitro and in animal studies, many agents have not been evaluated in clinical trials. Additionally, the clinical trials have limitations concerning the sample size, controls, measurement, heterogeneous groups, several arms of treatment, short follow-up or no blinding. Besides that, for most agents, the effects on the antitumor activity of cisplatin have not been evaluated in tumor-bearing animals, which discourages clinical trials. Further well-designed randomized controlled clinical trials are necessary to definitely demonstrate the effectiveness of the oto- or neuroprotective agents proposed by animal and in vitro studies.

The impact of chemotherapy on cognitive function: a multicentre prospective cohort study in testicular cancer

PURPOSE

The causal link between chemotherapy and cognitive impairment is unclear. We studied testicular cancer patients' objective and subjective cognitive function longitudinally, comparing a surgery group with a surgery + chemotherapy group, addressing prior methodological issues using a computerized test to limit assessment issues, and controlling for confounding variables.

METHODS

Prospectively, of 145 patients from 16 centres with sufficient data, n = 61 receiving surgery + chemotherapy (etoposide and cisplatin ± bleomycin, BEP/EP; or single agent carboplatin) were compared to n = 41 receiving surgery alone. CogHealth assessed six objective cognitive tasks. The Cognitive Failures Questionnaire assessed self-perceived cognitive dysfunction. The Functional Assessment of Chronic Illness Therapy-Fatigue and the Hospital Anxiety and Depression Scale assessed psychological influences. Linear mixed models compared changes from baseline (< 6 months post-surgery/pre-chemotherapy) to follow-up (12-18 months post-baseline), controlling covariates.

RESULTS

There were no significant interaction effects for five objective cognitive function tasks suggesting that changes over time were not due to group membership. However, psychomotor function (controlling for age) and physical well-being were significantly worse for the chemotherapy versus the surgery group at baseline, with groups converging by follow-up. Groups showed no differences in subjective cognitive dysfunction. The chemotherapy group showed higher anxiety, poorer functional well-being and worse fatigue compared to the surgery-only group at baseline, but not by follow-up. For both groups, emotional well-being, functional well-being and anxiety significantly improved over time.

CONCLUSION

No substantive differences in objective or subjective cognitive dysfunction in either group persisted 12-18 months post-baseline. Patients undergoing chemotherapy for testicular cancer differ from findings in breast cancer populations.

TRIAL REGISTRATION

ClinicalTrials.gov Identifier: ACTRN12609000545268.

Nicotinic treatment of post-chemotherapy subjective cognitive impairment: a pilot study

PURPOSE

Persistent chemotherapy-related cognitive impairment (pCRCI) is commonly reported following cancer treatment and negatively affects quality of life; however, there is currently no pharmacological treatment indicated for pCRCI. This pilot study obtained preliminary data regarding the use of transdermal nicotine patches as a therapeutic strategy for women with pCRCI to (1) reduce subjective cognitive complaints and (2) enhance objective cognitive performance in breast, colon, lymphoma, or ovarian cancer survivors with pCRCI.

METHODS

Participants were randomized to either placebo (n = 11) or transdermal nicotine (n = 11) for 6 weeks, followed by 2 weeks of treatment withdrawal for a total of 8 weeks. Participants were assessed using both subjective and objective measures of cognitive functioning at five visits before, during, and after treatment.

RESULTS

Over the course of the study, women in both groups improved substantially in severity of self-reported cognitive complaints measured by Functional Assessment of Cancer Therapy-Cognitive Function Perceived Cognitive Impairments regardless of treatment arm. Additionally, objective cognitive performance measures improved in both groups; however, there was no significant difference in improvement between groups.

CONCLUSIONS

Due to a large placebo response, we were unable to determine if a drug effect was present. However, we did observe substantial improvement in self-reported cognitive symptoms, likely resulting from factors related to participation in the trial rather than specific drug treatment effects.

TRIAL REGISTRATION

The study was registered with clinicaltrials.gov (trial registration: NCT02312943).

IMPLICATIONS FOR CANCER SURVIVORS

These results suggest that women with pCRCI can exhibit improvement in subjective cognition, with attention paid to symptoms and close follow-up over a short period of time.

Neuropsychological disorders in non-central nervous system cancer: a review of objective cognitive impairment, depression, and related rehabilitation options

AIM

The objective of the present review was to systematically characterize the types of cognitive impairment that are found in different non-brain types of cancer as measured by objective and validated tests, and also to further examine depression and cognitive function in cancer patients and explore their available rehabilitation treatments.

RESULTS

A total of 29 articles were reviewed. Most of these studies suggest that chemotherapy as well as the combination of chemotherapy and hormonal therapy can influence cognition in different types of cancer patients. Breast cancer patients appear to be the most affected in neuropsychological function, specifically in terms of cognitive impairment and reduced quality of life, as compared to other non-brain solid tumours. Overall, the most impaired functions were verbal ability, memory, executive function, and motor speed.

CONCLUSION

Chemotherapy-related cognitive dysfunction remains under-recognized and undertreated. The various studies reported differing and non-homogenous findings with mixed results, obtained by self-reporting and web-assisted assessment, with other confounding factors such as age and depression during both cancer diagnosis and treatment. An objective neuropsychological assessment is fundamental to avoid underestimation of the extent of chemobrain. Self-reported and web-assisted assessment may ultimately result in confusion between the neuropsychological signs of chemobrain versus those of depression.

Psychosocial Issues in Long-Term Survivors of Testicular Cancer

Testicular cancer is the most frequent tumor in young males aged 15-39 years. As cure rates are currently around 90%, the prevalence of survivors is increasing. However, a disease-free condition does not necessarily correspond to a life free of physical and psychosocial health problems. The aim of this review was to explore psychosocial morbidity among testicular cancer survivors. A literature search was conducted in three electronic databases (PubMed, Medline, and Embase). The results of the search on cancer survivors were then combined with those of the search on psychosocial concerns and work performance. Eighty-four publications met the inclusion criteria. Physical, psychological, work-related problems and changing perspectives about work and life in general influenced life and career decisions among testicular cancer survivors. Individual health, sexual relationships and work problems, affect several important aspects of survival and significantly influence the QoL of long-term survivors.

A systematic review of quantitative observational studies investigating psychological distress in testicular cancer survivors

OBJECTIVE

Testicular cancer (TC) affects young men and may cause psychological distress despite a good prognosis. This systematic review evaluated the prevalence, severity, and correlates of anxiety, depression, fear of cancer recurrence (FCR), and distress in TC survivors.

METHODS

A systematic search of literature published 1977 to 2017 was conducted to find quantitative studies including TC survivor-reported outcomes relevant to review objectives. The quality of included articles was assessed, and a narrative synthesis conducted.

RESULTS

Of 6717 articles identified, 66 (39 good, 20 fair, and 7 poor quality) reporting results from 36 studies were included. Testicular cancer survivors' mean anxiety levels were higher than in the general population, while mean depression and distress were no different. Clinically significant anxiety (≈1 in 5) and to a lesser extent distress (≈1 in 7), but not depression, were more prevalent in TC survivors than the general population. Approximately 1 in 3 TC survivors experienced elevated FCR. Poorer psychological outcomes were more common among TC survivors who were single, unemployed/low socio-economic status, suffering from co-morbidities, experiencing worse symptoms/side effects, and using passive coping strategies.

CONCLUSIONS

Many TC survivors do not experience significant psychological morbidity, but anxiety and FCR are prevalent. Inadequate coping resources (eg, low socio-economic status and social support) and strategies (eg, avoidance) and greater symptoms/side effects were associated with poorer outcomes. Theoretically driven prospective studies would aid understanding of how outcomes change over time and how to screen for risk. Age and gender appropriate interventions that prevent and manage issues specific to TC survivors are also needed.

Adverse Effects of Vincristine Chemotherapy on Cell Changes in Seminiferous Tubules and Cetrorelix GnRH Antagonist Inhibitory Effects in Mice

The present study was designed to determine changes in spermatogenesis in adult mice after an intraperitoneal injection of vincristine. The effect of a GnRH antagonist synchronous to chemotherapy, which might protect spermatogenesis by halting cell division in spermatogenic cells, was also investigated.

Toxicities Associated with Cisplatin-Based Chemotherapy and Radiotherapy in Long-Term Testicular Cancer Survivors

Testicular cancer has become the paradigm of adult-onset cancer survivorship, due to the young age at diagnosis and 10-year relative survival of 95%. This clinical review presents the current status of various treatment-related complications experienced by long-term testicular cancer survivors (TCS) free of disease for 5 or more years after primary treatment. Cardiovascular disease and second malignant neoplasms represent the most common potentially life-threatening late effects. Other long-term adverse outcomes include neuro- and ototoxicity, pulmonary complications, nephrotoxicity, hypogonadism, infertility, and avascular necrosis. Future research efforts should focus on delineation of the genetic underpinning of these long-term toxicities to understand their biologic basis and etiopathogenetic pathways, with the goal of developing targeted prevention and intervention strategies to optimize risk-based care and minimize chronic morbidities. In the interim, health care providers should advise TCS to adhere to national guidelines for the management of cardiovascular disease risk factors, as well as to adopt behaviors consistent with a healthy lifestyle, including smoking cessation, a balanced diet, and a moderate to vigorous intensity exercise program. TCS should also follow national guidelines for cancer screening as currently applied to the general population.

Expectations of survivors, caregivers and healthcare providers for testicular cancer survivorship and quality of life

Aims and background

We compared expectations of testicular cancer survivors and their caregivers with those of healthcare providers for testicular cancer survivorship care and quality of life to identify experiences and potential expectations in which there was disagreement.

Methods

In a meeting with testicular cancer survivors, their caregivers, and care providers with an interest in testicular cancer, we distributed a structured questionnaire with 24 questions divided into 3 sections: personal information, information on the quality of life of survivors, information on the role of care providers, general practitioners and health-related internet sources in the expectations of survivors.

Results

The overall response rate was 91% (29 of 32) for patients and 100% (14 of 14) for caregivers with all questionnaires evaluable, while among 60 care providers, 42 (70%) responded with 41 (68%) evaluable. Between patients/caregivers and care providers, expectations were most incongruent for the role of primary care physicians in testicular cancer follow-up: important/fundamental for 58% of patients/caregivers and 88% of care providers (P = 0.010). Comparing patients/caregivers with care providers in their views of the experience of testicular cancer survivorship, we found several discrepancies: the fear of recurrence was high/very high for 18 of 43 (42%) patients/caregivers and in the perception of 40 of 41 (98%) care providers (P <0.001), and psychological distress was considered as highly relevant by 35% of patients/caregivers and 93% of care providers (P <0.001).

Conclusions

Patients/caregivers and care providers have different perceptions of survivors' experiences and discordant expectations with respect to the roles of primary care providers in testicular cancer survivorship care. Uncertainties about the roles and responsibilities of physicians can lead to deficiencies in care, supporting the need to make survivorship care planning a standard component in cancer management.

Cognitive Effects of Chemotherapy and Cancer-Related Treatments in Older Adults

Advances in cancer treatment are producing a growing number of cancer survivors; therefore, issues surrounding quality of life during and following cancer treatment have become increasingly important. Chemotherapy-related cognitive impairment (CRCI) is a problem that is commonly reported following the administration of chemotherapy treatment in patients with cancer. Research suggests that CRCI can persist for months to years after completing treatment, which has implications for the trajectory of normal and pathologic cognitive aging for the growing number of long-term cancer survivors. These problems are particularly relevant for older individuals, given that cancer is largely a disease of older age, and the number of patients with cancer who are aged 65 years or older will increase dramatically over the coming decades. This review will briefly summarize empirical findings related to CRCI, discuss CRCI in older patients with cancer, propose potential causative hypotheses, and provide a canonical patient case to illustrate how CRCI presents clinically. Finally, potential intervention strategies for CRCI will be highlighted and issues to consider when evaluating older patients with a history of cancer will be discussed.

Lower cognitive performance and white matter changes in testicular cancer survivors 10 years after chemotherapy

OBJECTIVE

Chemotherapy (CT) is associated with adverse effects on cognition. Only few studies have investigated cognition in testicular cancer (TC) patients and studies on very late effects of CT on cognition are absent. Further, brain changes in relation to treatment have not been investigated in TC. The objective of the present study is to compare psychosocial functioning, cognitive performance and brain (micro)structure following surgery and CT for TC, against surgery (S)-only.

METHODS

Twenty-eight CT (43.1±7.5 y) and 23 S-only (48.2±9.5y) TC survivors on average 14 yr post-treatment were examined using questionnaires, neurocognitive tests, and 3T-MRI [Diffusion Kurtosis Imaging (DKI), T1-weighted and Fluid Attenuated Inversion Recovery]. A multivariate cognitive performance score (Mahalanobis distance) was calculated to indicate the grade of cognitive performance. Kurtosis parameters, gray matter, and white matter (WM) volume were calculated from MRI data.

RESULTS

Overall, the CT group showed lower cognitive performance (5.35±1.7) compared with the S-only group (4.4±0.9; P=0.03; d=0.70). Further, TC patients reported more memory problems after CT. DKI revealed a significantly higher radial kurtosis after CT in several anterior and posterior brain areas (P<0.05, corrected), but this was unrelated to cognitive performance.

CONCLUSIONS

This cross-sectional study suggests that men receiving CT for TC are at risk for long-term lower cognitive performance. Although CT affected WM microstructure, this was unrelated to cognitive performance. More extensive, preferably prospective studies are warranted to confirm these results and to provide more insight into the possible mechanisms behind the observed cognitive sequelae after treatment for TC.

The prevalence, severity, and correlates of psychological distress and impaired health-related quality of life following treatment for testicular cancer: a survivorship study

PURPOSE

This study aimed to establish the prevalence, severity, and correlates of psychological distress and impaired generic health-related quality of life (HRQOL) in testicular cancer (TC) survivors.

METHODS

Men who had completed active anti-cancer treatment for TC between 6 months and 5 years previously showing no evidence of recurrence were recruited from 14 Australian cancer centers from September 2009 to February 2011. Participants completed a self-report questionnaire measuring demographic, disease, and treatment information, psychological distress (i.e., depression, anxiety, and stress; DASS21), generic health-related quality of life (HRQOL; SF-36v2), TC-specific HRQOL (EORTC QLQ-TC26), coping (MAC), social support (DUFSS), and unmet needs (CaSUN).

RESULTS

Of 486 eligible TC survivors, 244 (50.2%) completed the questionnaire. Compared with normative data, TC survivors reported: small but statistically significant increases in mean levels of anxiety and depression; a greater prevalence of moderate to extremely severe anxiety (19%) and depression (20%); and significant deficits to mostly mental aspects of generic HRQOL. The most problematic TC-specific HRQOL issues (e.g., fear of recurrence) were also more mental than physical. In multiple regression analyses, the strongest correlates of psychological distress and impaired generic HRQOL were psychosocial (e.g., helpless/hopeless coping and lower social support) rather than disease or treatment factors.

CONCLUSIONS

Generally, TC survivors appear to experience mild psychological distress and HRQOL impairments, while a vulnerable subgroup experience more severe morbidity.

IMPLICATIONS FOR CANCER SURVIVORS

There is a need to identify TC survivors at risk of poorer outcomes and for interventions to target the areas of greatest impairment (i.e., psychological distress and mental HRQOL).

Clinical characteristics, pathophysiology, and management of noncentral nervous system cancer-related cognitive impairment in adults

Answer questions and earn CME/CNE Over the past few decades, a body of research has emerged confirming what many adult patients with noncentral nervous system cancer have long reported-that cancer and its treatment are frequently associated with cancer-related cognitive impairment (CRCI). The severity of CRCI varies, and symptoms can emerge early or late in the disease course. Nonetheless, CRCI is typically mild to moderate in nature and primarily involves the domains of memory, attention, executive functioning, and processing speed. Animal models and novel neuroimaging techniques have begun to unravel the pathophysiologic mechanisms underlying CRCI, including the role of inflammatory cascades, direct neurotoxic effects, damage to progenitor cells, white matter abnormalities, and reduced functional connectivity, among others. Given the paucity of research on CRCI with other cancer populations, this review synthesizes the current literature with a deliberate focus on CRCI within the context of breast cancer. A hypothetical case-study approach is used to illustrate how CRCI often presents clinically and how current science can inform practice. While the literature regarding intervention for CRCI is nascent, behavioral and pharmacologic approaches are discussed.

Cognitive impairment in testicular cancer survivors 2 to 7 years after treatment

PURPOSE

The aim of the present study was to determine the prevalence of cognitive impairment (CI) in a group of testicular (TC) survivors by comparing their neuropsychological test scores with normative data and to assess their performance in specific cognitive domains.

METHODS

Seventy-two TC survivors were evaluated 2 to 7 years post-treatment with a neuropsychological test battery that assessed multiple cognitive domains-attention and working memory, processing speed, verbal fluency, learning and memory, and executive functioning. Test scores were compared with normative data, and CI status was calculated for each participant.

RESULTS

In group-level analyses, survivors exhibited significantly impaired scores on a majority (9/12) of the neuropsychological outcomes (p < 0.01). In individual-level analyses, 62.5 % of the survivors were classified as having CI, significantly exceeding the expected normative frequency of 25 % (binomial test: p < 0.001). In particular, CI was observed in multiple outcomes related to verbal learning and memory (29 to 33 % of participants), visual learning and memory (14-28 %), processing speed (8-24 %), executive functioning (17 %), and attention and working memory (4-15 %). No association was found between treatment modality (surgery ± chemotherapy) and CI.

CONCLUSIONS

The prevalence of CI in TC survivors was unexpectedly high, with survivors performing significantly worse than expected on a majority of the neuropsychological outcomes. While the findings are preliminary in nature, they still have important implications for the diagnosis and treatment of CI in TC survivors.

Cognition in breast cancer survivors: hormones versus depression

BACKGROUND

OBJECTIVE

Breast cancer survivors receiving hormone treatment and/or endorsing histories of receiving chemotherapy report changes in their cognitive capacity, which is often not supported by formal testing. To address these conflicting reports, this study examined survivors' applied cognitive capacity and its association with hormone treatment, depression, and selected demographics.

METHODS

A descriptive, correlational, cross-sectional survey design was employed. There were 357 women who completed a survey comprised of 69 questions. The survey included both investigator-developed questions and instruments from the PROMIS(®) system.

RESULTS

There were significant main effects for hormone therapy, race, and depression. Depression explained the largest portion of variance of the perceived decreases in cognitive function among breast cancer survivors.

CONCLUSIONS

Survivor complaints of changes in cognitive function may be a predictor for evaluating the presence of mood disorders and less a function of hormone therapy or chemotherapy history.

Motor and Behavioral Changes in Mice With Cisplatin-Induced Acute Renal Failure

We have previously shown that chronic renal failure in rats induces changes in motor activity and behavior. Similar work on the possible effects of acute renal failure (ARF) induced by cisplatin (CP) is lacking. This is the subject matter of the current work. CP was injected intraperitoneally (i.p.) at a single dose of 20 mg/kg to induce a state of ARF, and three days later, its effects on motor activity, thermal and chemical nociceptive tests, neuromuscular coordination, pentobarbitone-sleeping time, exploration activity and two depression models were investigated. The platinum concentration in the kidneys and brains of mice was also measured. The occurrence of CP-induced ARF was ascertained by standard physiological, biochemical and histo-pathological methods. CP induced all the classical biochemical, physiological and histopathological signs of ARF. The average renal platinum concentration of CP-treated mice was 5.16 ppm, but there was no measurable concentration of platinum in the whole brains. CP treatment significantly decreased motor and exploration activities, and increased immobility time in depression models, suggesting a possible depression-like state. There was also a significant decrease in neuromuscular coordination in CP-treated mice. CP, given at a nephrotoxic dose, induced several adverse motor and behavioral alterations in mice. Further behavioral tests and molecular and biochemical investigations in the brains of mice with CP-induced ARF are warranted.

A prospective study of cognitive function in men with non-seminomatous germ cell tumors

OBJECTIVE

Longitudinal neuropsychological assessments were performed to determine if adjuvant chemotherapy was associated with cognitive dysfunction in men with non-seminomatous germ cell tumors (NSGCT).

METHODS

Patients with NSGCT status post-orchiectomy that either received adjuvant chemotherapy (n = 55) or did not (n = 14) were recruited. Patients were tested before chemotherapy, 1 week post-chemotherapy (or 3 months later in the surveillance group) and 12 months after the baseline evaluation.

RESULTS

Compared with the surveillance group, patients treated with chemotherapy had higher rates of cognitive decline at 12 months (overall cognitive decline: 0%, 52%, and 67% in the surveillance, low exposure (LE), and high exposure (HE) group, respectively), greater number of tests that declined (mean of 0.1, 1.4, and 2.0 in the surveillance, LE, and HE group, respectively), and more frequent worsening in motor dexterity (0%, 48%, and 46% in the surveillance, LE, and HE group, respectively). Compared with the surveillance group, patients receiving more cycles of chemotherapy demonstrated worse psychomotor speed and learning and memory. Younger age was associated with greater incidence of overall cognitive decline at 12-month follow-up.

CONCLUSIONS

Men with NSGCT that received chemotherapy demonstrated greater rates of cognitive decline in a dose-response manner. Reductions in motor dexterity were most common. Decline in learning and memory also was evident particularly at later follow-up time points and in men receiving more chemotherapy. Men that receive chemotherapy for NSGCT are at risk for cognitive decline and may benefit from monitoring and referral for psychosocial care.

New approaches to understand cognitive changes associated with chemotherapy for non-central nervous system tumors

CONTEXT

Researchers have described a constellation of cognitive deficits (e.g., impairments in executive functions, working memory, attention, and information-processing speed) associated with cancer treatment, and specifically chemotherapy, for non-central nervous system tumors. However, findings have been inconsistent, largely because of measurement and study design issues.

OBJECTIVES

To propose ways for researchers to more clearly delineate and characterize the mild cognitive deficits and related outcomes that appear to affect a subset of cancer patients and suggest methods to make more effective use of the existing data to understand risk factors for impaired neuropsychological functioning.

METHODS

We examined the literature on the relationship between chemotherapy and cognitive impairment, as well as related literature on neuropsychological measurement, structural and functional neuroimaging, alternative measures of health outcomes, and integrative data analysis.

RESULTS

A more comprehensive picture of cognitive functioning might be obtained by incorporating nontraditional ecological measures, self-reports, computational modeling, new neuroimaging methods, and markers of occupational functioning. Case-control and integrative data analytic techniques potentially could leverage existing data to identify risk factors for cognitive dysfunction and test hypotheses about the etiology of these effects.

CONCLUSION

There is a need to apply new research approaches to understand the real-world functional implications of the cognitive side effects of chemotherapy to develop and implement strategies to minimize and remediate these effects before, during, and after cancer treatment.

A randomized trial of cognitive rehabilitation in cancer survivors

AIMS

The second most frequently reported post-treatment symptom in cancer survivors are concerns about impaired cognition. Despite numerous studies demonstrating significant impairments in a portion of survivors, information on effective treatments remains an emerging area of research. This study examined the effectiveness of a group-based cognitive rehabilitation intervention in cancer survivors.

MAIN METHODS

This study was a randomized, controlled study of a 7-week cognitive rehabilitation intervention delivered in group format. Participants were evaluated with subjective symptom questionnaires and objective neurocognitive tests prior to and following treatment.

KEY FINDINGS

Twenty-eight participants (mean age 58 years) with a median of 3 years (± 6 years) post-primary/adjuvant treatment and various cancer sites (breast, bladder, prostate, colon, uterine) completed the study. Compared to baseline, the treatment group demonstrated improvements in symptoms of perceived cognitive impairments (p<.01), cognitive abilities (p<.01) and overall quality of life with regard to cognitive symptoms (p<.01) as measured by the FACT-Cog. The treatment group also improved on objective measures of attention (p<.05) and a trend toward improvement on verbal memory. Significant improvement was not observed on all cognitive tests.

SIGNIFICANCE

A group based cognitive rehabilitation intervention in cancer survivors was effective for improving attention abilities and overall quality of life related to cognition. Results suggest that group based cognitive rehabilitation may be an effective intervention for treating cognitive dysfunction in cancer patients and should be further studied in a larger trial with an active control condition.

A meta-analysis of the effects of chemotherapy on cognition in patients with cancer

OBJECTIVE

The aim of this meta-analysis was to assess whether chemotherapy-related cognitive impairment is consistently observed in cancer patients and to identify the areas of cognition affected.

METHODS

The meta-analysis included 13 studies and examined the effects of chemotherapy on seven different cognitive domains, across five cancer types. It was the intention of this meta-analysis to stringently exclude many studies, allowing for examination of cognition in carefully selected studies of chemotherapy recipients who do not have current mood or anxiety diagnoses (or psychiatric or substance abuse histories), without brain cancer and who have not had radiotherapy or hormone treatment. A moderator analysis examined whether patient age, treatment duration and time since treatment end significantly contributed to chemotherapy-related cognitive impairment.

RESULTS

Evidence for the presence of cognitive impairment following cancer treatment was established for executive function and memory. No relationship was found between cognitive impairment and time since treatment cessation but a significant negative relationship was found for treatment duration. Age had no impact on treatment-related cognitive impairment.

CONCLUSIONS

Future research must be conducted on chemotherapy-related cognitive impairment in cancer types such as lymphoma and leukaemia, which have received a moderate amount of attention and colorectal cancer, which has received little attention. This would enable us to determine the extent to which chemotherapy-related cognitive impairment is a universal phenomenon associated with the cancer experience and its treatment regardless of cancer type.

Long-term and late effects of germ cell testicular cancer treatment and implications for follow-up

Germ cell testicular cancer (TC) represents a malignancy with high cure rates. Since the introduction of cisplatin-based chemotherapy in the late 1970s, the 5-year survival rate has increased considerably, and it is currently above 95%. Because TC is usually diagnosed before the age of 40 years, these men can expect to live for another 40 to 50 years after being successfully treated. This success, however, is hampered by an increased risk of long-term and late effects of treatment. Secondary malignant neoplasms and cardiovascular disease represent the most common potentially life-threatening late effects, typically occurring more than 10 years after treatment. Other long-term effects include pulmonary toxicity, nephrotoxicity, neurotoxicity, decreased fertility, hypogonadism, and psychosocial problems. The incidence and time to onset of these various adverse effects vary according to treatment type and intensity. There is still little knowledge about underlying mechanisms and genetic susceptibility of the various adverse effects. Apart from treatment burden, it is not yet possible to identify patients who are at high risk for certain late effects after TC treatment. In this clinical review, we present the current status regarding different somatic and psychosocial long-term late effects after treatment for TC, based on Medline searches and our own research. Moreover, we postulate recommendations for general medical evaluations that should begin after treatment is completed and continue during follow-up.

Meta-analysis of cognitive functioning in breast cancer survivors previously treated with standard-dose chemotherapy

PURPOSE

Evidence is mixed regarding long-term cognitive deficits in patients treated with chemotherapy. Previous meta-analyses have not focused specifically on the postchemotherapy period and have not incorporated several recent studies. The goal of the current study was to conduct a meta-analysis of cognitive functioning in breast cancer survivors who were treated with chemotherapy ≥ 6 months previously.

METHODS

A search of PubMed, PsycInfo, Cumulative Index to Nursing and Allied Health Literature, and Cochrane Library yielded 2,751 abstracts, which were independently evaluated by pairs of raters. Meta-analysis was conducted on 17 studies of 807 patients previously treated with standard-dose chemotherapy for breast cancer. Neuropsychological tests were categorized according to eight cognitive domains: attention, executive functioning, information processing, motor speed, verbal ability, verbal memory, visual memory, and visuospatial ability.

RESULTS

Deficits in cognitive functioning were observed in patients treated with chemotherapy relative to controls or prechemotherapy baseline in the domains of verbal ability (g = -0.19; P < .01) and visuospatial ability (g = -0.27; P < .01). Patients treated with chemotherapy performed worse than noncancer controls in verbal ability and worse than patients treated without chemotherapy in visuospatial ability (both P < .01). Age, education, time since treatment, and endocrine therapy did not moderate observed cognitive deficits in verbal ability or visuospatial ability (all P ≥ .51).

CONCLUSION

Results indicate that, on average, observed cognitive deficits in patients with breast cancer previously treated with chemotherapy are small in magnitude and limited to the domains of verbal ability and visuospatial ability. This information can be used to inform interventions to educate patients with breast cancer regarding the long-term impact of chemotherapy on cognitive functioning.

Neuropsychological assessment in a case of adult-onset hemophagocytic lymphohistiocytosis (HLH)

We present a case of an individual diagnosed with hemophagocytic lymphohistiocytosis (HLH), an extremely rare and commonly fatal disorder characterized by rapid dysregulation of immune system processes. Typical age of onset is in childhood, with adult-onset occurring less frequently. The pathophysiology of this condition is characterized by a hyperinflammatory response with infiltration of visceral organs, lymph nodes, bone marrow, and the central nervous system. The clinical presentation has been documented in the extant medical literature. However, there appear to be no published reports of neuropsychological functioning in HLH patients. The patient we present here is a 28-year-old woman with 16 years of education who developed HLH subsequent to systemic lupus erythematosus flare-up. She was initially comatose for 3 weeks. Acute MRI reported multiple subcortical abnormalities, including the brainstem. The patient underwent chemotherapy, immunosuppresant, and steroid treatments. She underwent a neuropsychological evaluation at 2.5 and 7 months post initial presentation. Preliminary neuropsychological evaluation found impairments in motor abilities and aspects of executive functions. Subsequent evaluation showed improved executive function and relative sparing of higher-order cognitive abilities, but continued impairment on motor tests. To our knowledge this is the first study to report neuropsychological data for an adult diagnosed with HLH.

Is chemotherapy associated with cognitive impairment?

Cancer survivors often report difficulties with memory and concentration—sometimes referred to by patients as "chemobrain" or "chemofog". The results from two recent studies suggest that, while chemotherapy itself may not be associated with cognitive impairment, some patients might already be experiencing cognitive difficulties before treatment is even started.

Testicular-cancer survivors experience compromised language following chemotherapy: findings in a Swedish population-based study 3-26 years after treatment

BACKGROUND

Studies suggest an increased risk for compromised cognitive function among cancer survivors. It is unclear to what extent chemotherapy is the cause and how the dysfunction, when present, affects everyday life. The objective was to study self-reported behaviours that may depend on cognitive function, among testicular-cancer survivors who received various cycles of cisplatin-based chemotherapy by comparing them with those who did not.

MATERIAL AND METHODS

We identified 1173 eligible men diagnosed with non-seminomatous testicular cancer treated according to the national cancer-care programs SWENOTECA I-IV between 1981 and 2004. During an 18-month qualitative phase we constructed a study-specific questionnaire including questions about specific activities and behaviour in everyday life.

RESULTS

We obtained information from 960 of 1173 (82%) testicular-cancer survivors diagnosed on average 11 years previously. The prevalence of "saying similar but incorrect words" at least once a week was 5% among those having received no chemotherapy versus 16% among those having received five or more cycles, giving a prevalence ratio ("relative risk", RR) of 3.3 with a 95% confidence interval of 1.5 to 7.1. The corresponding figure for "saying words in the wrong order" was 3.1 (1.7-5.8), for "difficulties understanding what other people mean" 3.1 (1.3-7.7), for "saying words other than planned" 2.2 (1.1-4.5) and for "difficulties completing sentences" 2.0 (1.0-3.6). The relative risks for those with a low level of education ranged between 4.9 (1.6-14.9) and 15.3 (1.9-120.5).

CONCLUSION

Testicular-cancer survivors in Sweden who have received five or more cycles of cisplatin-based chemotherapy experience an increased incidence of long-term compromised language; the effect is primarily seen among men with a low level of education.

Sequelae of treatment in long-term survivors of testis cancer

CONTEXT

Testicular cancer patients are often diagnosed at a young age, and because of the advances in the treatment of this disease, the vast majority have a normal life expectancy after therapy. Thus, recognition of the long-term sequelae of treatment (ie, surgery, radiation therapy, and chemotherapy) is particularly important in these patients.

OBJECTIVE

To review the adverse effects and the risk of secondary malignancy in long-term survivors of testicular cancer.

EVIDENCE ACQUISITION

We conducted a Medline search to identify original articles and reviews on the long-term effects of testicular cancer treatment. Although the search included articles from January 1948 to February 2011, the majority of the included articles were published in the last two decades.

EVIDENCE SYNTHESIS

All studies examining the long-term sequelae of treatment in testicular cancer are retrospective in nature, with most classified as cohort, case-control, and/or epidemiologic studies. Given that no standardized method of reporting long-term complications exists, evidence synthesis is limited.

CONCLUSIONS

Recent evidence suggests an increased risk of cardiovascular disease, neurotoxicity, and mild reductions in renal function in survivors of testicular cancer. Treatment of testicular malignancy can also negatively affect gonadal function and fertility and has been shown to result in an increased risk of solid malignancy and leukemia.

Self-reported cognitive functioning in postmenopausal breast cancer patients before and during endocrine treatment: findings from the neuropsychological TEAM side-study

OBJECTIVE

This study aimed to evaluate self-reported cognitive functioning of postmenopausal breast cancer patients before and during endocrine treatment compared with healthy female controls, and to investigate associations between self-reported cognitive functioning, cognitive test performance and anxiety/depression, fatigue, and menopausal complaints.

METHODS

Self-reported cognitive functioning, anxiety/depression, fatigue, menopausal complaints, and cognitive tests performance were assessed before (T1) and after 1 year (T2) of adjuvant endocrine treatment in postmenopausal chemotherapy-naïve breast cancer patients. Self-reported cognitive functioning was assessed by the cognitive failures questionnaire and interview questions concerning cognitive complaints. Patients participated in the TEAM-trial, a prospective randomized study investigating tamoxifen versus exemestane as adjuvant therapy for hormone-sensitive breast cancer. Identical information was obtained from healthy postmenopausal volunteers.

RESULTS

Two measures for self-reported cognitive functioning provided the distinctive results. At T1 and T2, healthy controls reported a higher frequency of cognitive failures than patients; change over time did not differ between groups. The prevalence of cognitive complaints did not differ between the groups at T1, but change over time regarding attention/concentration complaints differed between groups, due to an increased prevalence in tamoxifen users. Self-reported cognitive functioning showed moderate associations with anxiety/depression, fatigue, and menopausal complaints. Cognitive test performance was not associated with self-reported cognitive functioning, but weakly with anxiety/depression and fatigue.

CONCLUSION

Adjuvant therapy with tamoxifen and exemestane did not influence the self-reported frequency of cognitive failures. Increased attention/concentration complaints were observed in tamoxifen users, but not in exemestane users. This latter finding should be confirmed with better validated instruments.

Cognitive impairment in common, noncentral nervous system medical conditions of adults and the elderly

Common, noncentral nervous system medical conditions linked with cognitive impairment in adults and the elderly include: acute respiratory distress syndrome; cancer; chronic kidney disease; chronic obstructive pulmonary disease; coronary heart disease; hypertension; obesity (bariatric surgical candidates); obstructive sleep apnea; and type 2 diabetes. Cross-condition comparison of the nature and frequency of cognitive impairment is difficult as these conditions often coexist, and there exists no consensus as to the definition of cognitive impairment, nor the optimal number and type of neuropsychological tests required for evaluation. There is as yet no clear evidence for condition-specific profiles of cognitive impairment. Rather, a generalized profile consisting of subclinical levels of impairment in attention, processing speed, executive, and memory functions from bilateral frontal-subcortical ischemia fits across all conditions. This profile: occurs only in subgroups of patients; is inconsistently related to measures of illness severity; is unrelated to patient self-report or level of functional independence; is exacerbated by very high levels of emotional distress; and is reversible in some cases but can also progress to frank neurological disease (dementia) in others, especially the elderly, when multiple conditions coexist, and/or when medical condition severity progresses.

A prospective study of neuropsychological functioning in testicular cancer patients

BACKGROUND

Whether systemic chemotherapy has a negative effect on cognitive function in patients, concern oncologists. In testicular cancer patients (TCPs) treated with cisplatin-based chemotherapy, only few cross-sectional studies have addressed this concern. We prospectively studied neuropsychological functioning in TCPs.

PATIENTS AND METHODS

In a consecutive sampling, 122 TCPs were examined at baseline (after orchidectomy, before any additional treatment) and then at follow-up at a median of 12 months after end of treatment. The examinations included a neuropsychological test battery, interview on background variables and questionnaires on mental distress, fatigue and neurotoxic symptoms. Changes in neuropsychological functioning from baseline to follow-up were compared between three treatments groups: no chemotherapy (N = 31), one cycle of chemotherapy (N = 38) and two or more cycles of chemotherapy (N = 53). Variables associated with a decline in neuropsychological test performance from baseline to follow-up were explored.

RESULTS

No statistically significant differences in proportions of TCPs with a decline in neuropsychological test performance were observed between the three treatment groups. Decline in neuropsychological test performance was not associated with demographic variables, distress, fatigue or with chemotherapy.

CONCLUSION

No negative effect of systemic chemotherapy on neuropsychological test performance in TCPs at 1-year follow-up was found in this study.

Cognitive impairment in men with testicular cancer prior to adjuvant therapy

BACKGROUND

Cognitive dysfunction experienced by individuals with cancer represents an important survivorship issue because of its potential to affect occupational, scholastic, and social activities. Whereas early efforts to characterize cognitive dysfunction primarily focused on the effects of chemotherapy, more recent evidence indicates that impairment may exist before systemic treatment. This study characterized cognitive dysfunction before adjuvant chemotherapy in a sample of men diagnosed with nonseminomatous germ cell tumors (NSGCT) of the testis.

METHODS

Men with newly diagnosed NSGCT were recruited after orchiectomy but before adjuvant chemotherapy. Patients completed neuropsychological tests to assess attention, learning, language, executive function, and motor function. Self-report measures of depression and anxiety were also administered. An overall cognitive function index was computed for participants. Cognitive impairment was defined as a z-score of less than or equal to -1.5 on 2 or more tests, or a z-score of less than or equal to -2.0 on a single test.

RESULTS

Approximately 46% of patients exhibited cognitive impairment at the time of assessment, which is significantly greater than would be expected considering healthy population norms (binomial test: P < .0001). Patients exhibited impairments in motor function, verbal learning, and executive function much more frequently relative to normative expectations (binomial test: P < .0001).

CONCLUSIONS

The prevalence of cognitive impairment in men with newly diagnosed NSGCT is unexpectedly high before the receipt of adjuvant chemotherapy. Efforts to track cognitive function over time and to develop effective interventions are warranted.

Testicular cancer survivorship: research strategies and recommendations

Testicular cancer represents the most curable solid tumor, with a 10-year survival rate of more than 95%. Given the young average age at diagnosis, it is estimated that effective treatment approaches, in particular, platinum-based chemotherapy, have resulted in an average gain of several decades of life. This success, however, is offset by the emergence of considerable long-term morbidity, including second malignant neoplasms, cardiovascular disease, neurotoxicity, nephrotoxicity, pulmonary toxicity, hypogonadism, decreased fertility, and psychosocial problems. Data on underlying genetic or molecular factors that might identify those patients at highest risk for late sequelae are sparse. Genome-wide association studies and other translational molecular approaches now provide opportunities to identify testicular cancer survivors at greatest risk for therapy-related complications to develop evidence-based long-term follow-up guidelines and interventional strategies. We review research priorities identified during an international workshop devoted to testicular cancer survivors. Recommendations include 1) institution of lifelong follow-up of testicular cancer survivors within a large cohort setting to ascertain risks of emerging toxicities and the evolution of known late sequelae, 2) development of comprehensive risk prediction models that include treatment factors and genetic modifiers of late sequelae, 3) elucidation of the effect(s) of decades-long exposure to low serum levels of platinum, 4) assessment of the overall burden of medical and psychosocial morbidity, and 5) the eventual formulation of evidence-based long-term follow-up guidelines and interventions. Just as testicular cancer once served as the paradigm of a curable malignancy, comprehensive follow-up studies of testicular cancer survivors can pioneer new methodologies in survivorship research for all adult-onset cancer.