The latest report from the American Cancer Society estimates that there are 16.9 million cancer survivors in the United States [1]. A diagnosis of cancer or recurrence of cancer can cause psychological distress, including symptoms of anxiety and depression [2]. For patients receiving treatment for cancer, 10.3% meet the clinical criteria for an anxiety disorder [3], compared to 7% of those in the general population [4]. Prevalence of anxiety disorders is reported to be even higher for those who have been living with cancer for more than two years, with 17.9% of survivors meeting diagnostic criteria for anxiety [5]. As cancer treatments have become more effective than in previous decades, there are more cancer survivors living longer with cancer [6], yet also living with side and late effects of treatment.
Anxiety can manifest in both physical and psychological symptoms that negatively impact quality of life and are associated with a significantly increased risk of cancer incidence and cancer-specific mortality [7]. Psychological distress can affect a number of cancer outcomes, including quality of life, adherence to treatment, health behaviors, and potentially disease progression and survival, as well as increased utilization of health care resources [2].
Neuropathy is another common symptom of either cancer treatment or, less frequently, cancer itself and can be acute or chronic in nature [6]. There are a wide range of ways in which patients describe this experience, although peripheral neuropathy is often described as the sensation of shooting or stabbing pain and tingling or loss of feeling in the affected areas. This can impact many activities, such as walking, balance, and mood [6]. In patients receiving neurotoxic chemotherapy, such as platinum drugs, taxanes, vinca alkaloids, proteasome inhibitors, and immunomodulatory drugs, approximately 30–40% of patients will develop chemotherapy-induced peripheral neuropathy (CIPN) [8]. CIPN is a common cause of pain and decreased quality of life for cancer patients undergoing treatment as well as cancer survivors [9]. In approximately 50% of people who experience CIPN, this condition will become chronic [10].
Mindfulness meditation
Historically conceptualized in Buddhist spiritual practice with the purpose of cultivating compassion and alleviating suffering, mindfulness meditation has been engaged in for thousands of years [11, 12]. Mindfulness can be described as bringing non-judgmental attention or awareness to one’s moment-to-moment experience [12]. Mindfulness meditation is the setting aside of time to specifically engage in what is often a seated meditation practice where participants are instructed to close their eyes and are guided through a breathing and focused attention process [13].
The practice of mindfulness with the goal of improving well-being has been described as a universal human capacity that does not involve a particular cultural or religious belief system [11, 12]. In the recent decades, mindfulness has gained popularity in the mainstream United States and has been found to have numerous psychological and physical benefits, with a growing body of research on clinical applications of mindfulness to treat various conditions [2, 11, 14–17–20]. Mindfulness has been studied as a therapy to reduce symptoms of depression and anxiety [2], improve outcomes for chronic pain [14], reduce stress and improve attention [15], improve brain function and connectivity [16], and improve immune function [17].
The practice of mindfulness has been shown to improve quality of life and be related to more positive mental health in cancer survivors [18]. Recent studies indicate that mindfulness-based interventions have a positive impact on depression, anxiety, and quality of life in ovarian cancer patients [2], men living with cancer [19], and metastatic non-small cell lung cancer patients and their caregivers [20], just to name a few.
Online behavioral therapy for anxiety and cancer-related neuropathy
While mindfulness is gaining a larger evidence base for applications in the clinical setting, lack of trained personnel, time constraints, reimbursement issues, and patient and provider availability are barriers to delivery and participation in a traditional, face-to-face mindfulness course [21]. Researchers in a recent face-to-face mindfulness-based stress reduction (MBSR) intervention for young adult cancer survivors identified barriers to participation reported by eligible patients who declined to participate in the intervention [22]. Out of the 446 eligible people who declined to participate, the majority reported distance to the intervention site as the main factor (41.5%), followed by time constraints (21.7%). A subset of individuals who declined were asked if they would participate in the course if it were offered in a different location or format. Of those asked, 73.8% stated that they would enroll in a MBSR course offered closer to their home, and 70.8% stated that they would enroll in an online MBSR course. Of the individuals who stated interest in an online MBSR course, 70.9% stated that they would enroll in a self-directed course delivered through educational modules [22]. These barriers to face-to-face mindfulness interventions limit access to care, and therefore make face-to-face interventions less likely to be a realistic treatment model [21], but online interventions for mindfulness provide a potential avenue to overcome these barriers and increase accessibility to effective mindfulness interventions.
Advances in technology have allowed for delivery of effective online interventions in the patient’s home through a mobile app [23]. When used to effectively disseminate evidence-based interventions, apps have the potential to increase access to evidence-based healthcare and use of evidence-based practices by the general population [21, 23]. Previous studies have shown that online mindfulness-based interventions involving guided meditation audios are feasible and acceptable for cancer survivors [24], who may be too ill or lack the resources to travel to a face-to-face mindfulness intervention. A recent study using the Calm mobile app for mindfulness meditation found that use of the app for 10 minutes daily for four weeks was significantly effective in reducing symptoms of depression and anxiety in patients with myeloproliferative neoplasm, but did not significantly impact sleep disturbance [25].
The current American Society of Clinical Oncology clinical practice guideline does not recommend any pharmacologic agents in preventing CIPN, and there is limited evidence for treatment of existing CIPN with pharmacologic agents, with a moderate recommendation for the use of duloxetine [26]. Previous studies suggest that online interventions may have the potential to improve conditions involving chronic pain. A study involving an online, self-guided cognitive and behaviorally-based pain management intervention for cancer survivors experiencing CIPN had significantly greater improvements in "worst pain" compared with individuals receiving usual care [27].
Mindfulness Coach, an iOS- and Android-based mobile app, is designed to deliver a mobile mindfulness training course designed by researchers from the U.S. Department of Veterans Affairs (VA) [21, 28]. The senior author on this paper, Dr. Erin Bantum, was part of the team that developed the most recent version of the app. Initially developed among other mobile apps in collaboration with the U.S. Department of Defense [28], Mindfulness Coach is freely available to the general public for both iOS and Android operating systems. A recent study exploring the effects of the app among the general population found that use of the Mindfulness Coach app was feasible, and increased use was strongly correlated with an increase in scores measuring mindfulness characteristics including observing, describing, acting with awareness, nonreactivity to inner experience, and non judging of inner experience, as measured by the Five-Facet Mindfulness Questionnaire Short Form (FFMQ-SF) [21, 29].
With the larger goal of decreasing anxiety and cancer related neuropathy for cancer survivors, the Online Mobile Mindfulness (OMM) study is underway to test the impact of 8 weeks of use of the Mindfulness Coach mobile app for cancer survivors. The study contains the following primary aims: Evaluate the impact of mobile mindfulness on anxiety or cancer related neuropathy (depending on the arm selected), other pain, fatigue, trauma, and sleep, and to evaluate the satisfaction with the Mindfulness Coach mobile app.