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Simple Summary: This article outlines a framework for the development and maintenance of chemotherapy-induced peripheral neuropathy using the 3P model, which focuses on predisposing, precipitating, and perpetuating factors. Predisposing factors increase the risk of CIPN onset; chemotherapy triggers the development of CIPN; and perpetuating factors maintain CIPN and limit recovery, such that CIPN becomes a chronic condition. In our proposed model, we have identified demographic, genetic, and clinical factors, such as comorbidities, as predisposing factors. Chemotherapy type, dose, and schedule are precipitating factors. Perpetuating factors include depression and physical activity. The proposed model can be used to identify treatment targets for the management of chemotherapy-induced peripheral neuropathy. Background: Chemotherapy-induced peripheral neuropathy (CIPN) is a common and debilitating symptom experienced by cancer survivors. Despite the burden of CIPN-related symptoms, interventions remain limited. Objectives: This narrative review seeks to propose a framework for CIPN predisposing, precipitating, and perpetuating factors (3Ps), which will provide a foundation for future research and clinical interventions aimed at mitigating CIPN-related symptoms and morbidity. Methods: A comprehensive literature search was performed using PubMed, guided by keywords related to "chemotherapy-induced peripheral neuropathy." Studies were limited to those with full text available in English. Results: Predisposing factors outlined in this framework, such as older age and comorbid conditions, can be used to identify patients who have a higher risk of developing CIPN. The major precipitating factor of CIPN is the delivery of chemotherapy to peripheral nerves, which may be mitigated via cryotherapy or compression therapy during chemotherapy. Perpetuating factors can offer insight into psychological, cognitive, and behavioral modifications that could be treatment targets for CIPN management. Conclusion: The proposed 3P model can guide the development of effective interventions for CIPN by suggesting modifiable psychological and behavioral treatment targets that may mitigate the impact of CIPN for cancer patients. [ABSTRACT FROM AUTHOR]

Simple Summary: Physical inactivity and sleep problems are commonly reported by women going through chemotherapy for gynecologic cancer. Inflammation from cancer and its treatment might contribute to these issues, but existing findings are limited. We examined relationships between biomarkers of inflammation and data from wearable devices to objectively measure physical activity and sleep. We collected data from women with gynecologic cancer during chemotherapy and followed up with them for a year after completing chemotherapy. We also compared their results to women without cancer who were assessed at similar time intervals. We found that women with cancer were less active and had more sleep problems than controls even a year after completing chemotherapy. Greater inflammation was also related to less physical activity and more sleep problems. Future research should test whether interventions aimed at reducing inflammation can help women with cancer to be more active and have fewer sleep problems. Little is known regarding associations between inflammatory biomarkers and objectively measured physical activity and sleep during and after chemotherapy for gynecologic cancer; thus, we conducted a longitudinal study to address this gap. Women with gynecologic cancer (patients) and non-cancer controls (controls) completed assessments before chemotherapy cycles 1, 3, and 6 (controls assessed contemporaneously), as well as at 6- and 12-month follow-ups. Physical activity and sleep were measured using wrist-worn actigraphs and sleep diaries, and blood was drawn to quantify circulating levels of inflammatory markers. Linear and quadratic random-effects mixed models and random-effects fluctuation mixed models were used to examine physical activity and sleep over time, as well as the associations with inflammatory biomarkers. On average, patients (n = 97) and controls (n = 104) were 62 and 58 years old, respectively. Compared to controls, patients were less active, more sedentary, had more time awake after sleep onset, and had lower sleep efficiency (p-values < 0.05). Across groups, higher levels of TNF-α were associated with more sedentary time and less efficient sleep (p-values ≤ 0.05). Higher levels of IL-1β, TNF-α, and IL-6 were associated with lower levels of light physical activity (p-values < 0.05). Associations between inflammatory biomarkers, physical activity, and sleep did not differ between patients and controls. Given these results, we speculate that inflammation may contribute to less physical activity and more sleep problems that persist even 12 months after completing chemotherapy. [ABSTRACT FROM AUTHOR]

Simple Summary: Treatment-related symptoms such as fatigue, depression, and disruptions in sleep and physical activity are common and distressing in gynecologic cancer patients. The aim of our study was to examine whether higher levels of inflammation are associated with worse symptomatology, and if these associations are stronger for patients with gynecologic cancer (n = 121) than age-matched women without a cancer history (i.e., controls; n = 105). Elevated levels of C-reactive protein were associated with depression and disrupted physical activity, but there were no other significant associations between inflammation and treatment-related symptoms. Findings suggest that inflammation may not play a significant role in the development of fatigue or sleep disturbance among gynecologic cancer patients but may contribute to depression and physical inactivity. Previous research suggests that inflammation triggers cancer-treatment-related symptoms (i.e., fatigue, depression, and disruptions in sleep and physical activity), but evidence is mixed. This study examined relationships between inflammatory biomarkers and symptoms in patients with gynecologic cancer compared to age-matched women with no cancer history (i.e., controls). Patients (n = 121) completed assessments before chemotherapy cycles 1, 3, and 6, and 6 and 12 months later. Controls (n = 105) completed assessments at similar timepoints. Changes in inflammation and symptomatology were evaluated using random-effects mixed models, and cross-sectional differences between patients and controls in inflammatory biomarkers and symptoms were evaluated using least squares means. Associations among inflammatory biomarkers and symptoms were evaluated using random-effects fluctuation mixed models. The results indicated that compared to controls, patients typically have higher inflammatory biomarkers (i.e., TNF-alpha, TNFR1, TNFR2, CRP, IL-1ra) and worse fatigue, depression, and sleep (ps < 0.05). Patients reported lower levels of baseline physical activity (p = 0.02) that became more similar to controls over time. Significant associations were observed between CRP, depression, and physical activity (ps < 0.05), but not between inflammation and other symptoms. The results suggest that inflammation may not play a significant role in fatigue or sleep disturbance among gynecologic cancer patients but may contribute to depression and physical inactivity. [ABSTRACT FROM AUTHOR]

Background: Chemotherapy-induced peripheral neuropathy (CIPN) is well-documented and can become chronic for up to a third of patients. CIPN management is hampered by limited pharmacological options. Thus, identifying modifiable behaviors that influence CIPN may help inform future interventions.Purpose: The purpose of the current study was to examine bidirectional relationships between sleep quality, physical activity, and CIPN during and after chemotherapy.Methods: Participants were 138 women with gynecologic cancer (M age = 61, 94% white, 96% non-Hispanic), collected as part of an ongoing study. Assessments occurred at postcycle 1, postcycle 6, and 6- and 12-month postchemotherapy. CIPN (EORTC-CIPN20), sleep quality (PSQI), and physical activity (IPAQ) were assessed via self-report. Objective physical activity was assessed via wrist actigraphy. Latent change score models were used to examine lagged relationships between CIPN, sleep quality, and physical activity pairs.Results: Over the study period, sleep quality was found to contribute to CIPN (p = .001), but not the reverse (p > .05). Bidirectional relationships were observed between CIPN and both objective and subjective walking (ps ≤ .001). Illustrations of these relationships showed that patients with less CIPN early in treatment demonstrate more substantial increases in walking over time, while those with higher CIPN demonstrate more consistent levels of walking during and after treatment.Conclusions: These findings suggest that worse sleep quality and lower walking levels may contribute to the course and maintenance of CIPN. Future investigation should evaluate the impact of early interventions aimed at improving sleep quality and encouraging physical activity in patients treated with chemotherapy. [ABSTRACT FROM AUTHOR]