Introduction
Chemotherapy-induced peripheral neuropathy (CIPN) is a major neurological side effect of the treatment of cancer, associated with early cessation of treatment and long-lasting disability [
1,
2]. There is now a burgeoning population of cancer survivors [
3,
4] potentially at risk of CIPN developing during and following treatment with neurotoxic platinum compounds, taxanes, vinca alkaloids, thalidomide, and bortezomib [
1]. CIPN commonly induces paraesthesia, pain, and numbness in the hands and feet, producing sensory ataxia and significantly heightened fall risk [
5]. Despite successful treatment, 77% of surveyed Australian cancer survivors treated with neurotoxic chemotherapies reported persistent neuropathy [
6], with up to 40% of cancer survivors left with long-term functional disability and reduced quality of life due to CIPN [
7]. The lack of proven preventative strategies and sensitive assessment tools has hampered the development of clinical trials and the optimal delivery of health services in this area.
A suite of patient-centred CIPN assessment tools have been developed, yet these remain under-utilised in clinical practice [
8]. The most common CIPN assessment tool is the clinician-administered National Cancer Institute Common Terminology for Adverse Events (neuropathy sensory subscale), which lacks inter-observer reliability [
9] and may under-report toxicity compared to patient reports [
10]. Although the deficits in neuropathy grading in clinical practice have long been recognised, and numerous patient-reported outcome measures have been developed for clinical use, this has not translated to widespread improvements in neuropathy assessment in routine oncology practice.
A key barrier to the uptake of improved CIPN assessment is the lack of guidance available to identify optimal clinical screening procedures suitable for use across health delivery services. The best practice timing, frequency, and responsibility for CIPN screening are not well established. Capturing CIPN symptoms early or identifying those at increased risk may allow opportunities for closer neurological surveillance by treating oncology teams [
11]. Additionally, with known functional deficits resulting from CIPN symptoms, including reduced mobility and increased falls risk [
12,
13], there is an important clinical need to ensure patients with functional impairments receive adequate rehabilitation to preserve their quality of life.
Clinical pathways and clinical decision-making tools have been shown to improve health care process measures across diverse settings [
14], reducing clinical variation and potentially improving outcomes [
15,
16]. There are limited pathways outlining best practices for the assessment and management of CIPN across healthcare teams, with current guidelines synthesising evidence for preventative and treatment interventions [
17,
18], without specifying implementation pathways. Limited data exist regarding CIPN assessment and management utilising multi-disciplinary models of care [
19‐
21]. An important next step is to operationalise how guidelines can be translated for use into a health service delivery pathway to ensure best practice CIPN assessment and management. Thus, the development of a CIPN clinical practice pathway provides a framework to aid clinical decision-making across healthcare teams that care for cancer patients. Accordingly, the aim of this study was to develop a clinical pathway for the assessment and management of CIPN via a Delphi consensus process and obtain feedback from relevant stakeholders regarding the pathway and future implementation strategies.
Results
Participant characteristics
A total of 70 participants completed the first stage of the Delphi survey (out of 260 invited participants), and 48 completed the second stage. The recruited participants included 68 health professionals from multiple disciplines, including medical oncologists/haematologists (31%), nurses (24%), neurologists (16%), allied health professionals (11%; Table
1), and two consumers. Most participants were employed in a tertiary referral centre (63%) and were from an urban setting (89%). Employment experience was spread evenly across the cohort.
Table 1
Demographic characteristics of study sample
Gender | Female | 45 | 64% |
| | Male | 25 | 36% |
Discipline | Medical oncologist/haematologist | 22 | 31% |
| | Nurse | 17 | 24% |
| | Neurologist | 11 | 16% |
| | Allied health | 8 | 11% |
| | Researcher | 6 | 9% |
| | Other (e.g., neurophysiologist, rehabilitation physician) | 4 | 6% |
| | Consumer | 2 | 3% |
Work setting | Tertiary referral centre | 44 | 63% |
| | District/local hospital | 12 | 17% |
| | Nonhospital based | 8 | 11% |
| | Other | 6 | 9% |
Years’ experience^ | 1–5 | 11 | 16% |
| | 6–10 | 20 | 29% |
| | 11–20 | 18 | 26% |
| | 20 + | 19 | 28% |
Rurality | Urban | 62 | 89% |
| | Rural/regional | 8 | 11% |
Delphi consensus process
Following the first stage of the Delphi survey, 4 of the 18 items across 4 themes did not reach a consensus. These items were related to CIPN screening and assessment (theme 1) and the feasibility of implementing the CIPN-path (theme 4) and are discussed further below. In the second stage, these four items were resurveyed with open-text feedback and general feedback on the entire clinical pathway collected. Levels of agreement for all individual items are presented in Table
2.
Table 2
Consensus achieved for all items related to the CIPN clinical pathway in both stage 1 and 2
Pretreatment review |
Patients should receive education about CIPN prior to treatment | 100 | | | | | |
Medical history should be obtained to identify potential risk factors for CIPN | 98.5 | 1.5 | | | | |
Patients with preexisting peripheral neuropathy or who are at high risk should be considered for pretreatment neurological assessment or closer monitoring | 94.2 | 2.9 | 2.9 | | | |
CIPN screening and assessment |
CIPN screening and assessment should continue to occur at follow-up visits after treatment has finished | 97.0 | 1.5 | 1.5 | - | | |
Screening for CIPN should occur at every treatment cycle | 94.2 | 2.9 | 2.9 | - | | |
Patients who are flagged with CIPN should be followed up with longer assessment tools to assess symptoms and impact on daily function | 94.2 | 5.8 | - | - | | |
Responses from patient-reported screening tools allow the clinical team to grade the patient’s CIPN | 84.1 | 10.1 | 5.8 | - | | |
The screening and assessment options recommended in the clinical pathway are appropriate | 75.7 | 21.3 | 3.0 | 97.9 | 2.1 | - |
A short patient-reported questionnaire is the most appropriate tool for use in initial CIPN screening | 72.5 | 23.2 | 4.3 | 95.8 | - | 4.2 |
Specific staff member(s) should be clearly designated as responsible for CIPN screening | 52.9 | 29.5 | 17.6 | 81.3 | 4.1 | 14.6 |
Management and referral |
Specific CIPN symptoms, including neuropathic pain, balance impairment and falls risk, and sleep disturbances, may warrant closer monitoring, additional investigation, or referral to other care providers | 98.5 | 1.5 | - | - | | |
All patients should be encouraged to be physically active during treatment to minimise impairments to physical function | 98.5 | 1.5 | - | - | | |
Patient education about CIPN symptom management is important and should consider safety measures to reduce the risk of falls and thermal injury as well as foot care | 98.5 | 1.5 | - | - | | |
If patients have functional deficits or risk of falls, referral to allied health such as an exercise physiologist/physiotherapist or occupational therapist will assist to improve functional capacity | 97.0 | 3.0 | - | - | | |
Patients with CIPN symptoms that are prolonged, worsening, longer duration, or increasing in distribution should be referred to a neurology service | 86.4 | 12.1 | 1.5 | - | | |
CIPN clinical pathway feasibility |
Implementing this CIPN clinical pathway may lead to improved CIPN outcomes in patients | 85.9 | 12.5 | 1.6 | - | | |
The proposed clinical pathway should be tailored to the specific resources available | 83.3 | 13.7 | 3.0 | - | | |
The proposed clinical pathway represents a realistic and achievable clinical process | 72.7 | 21.2 | 6.1 | 89.5 | 10.5 | - |
Pretreatment review
The consensus was reached on all 3 items related to pretreatment review in the first stage (94–100% agreement). Participants agreed that a pretreatment review should incorporate patient education about CIPN, a medical history should be obtained to identify potential CIPN risk factors and patients with preexisting neuropathy, and those at high-risk for CIPN should be considered for pretreatment neurological assessment or closer monitoring of CIPN symptoms throughout treatment. One respondent suggested that “patients at risk of CIPN such as extreme obesity or diabetes should be evaluated by neurology prior to neurotoxic chemotherapy”.
CIPN screening and assessment
The consensus was reached on 4/7 items (57%) in stage 1 (53–97% agreement), which was the lowest of all themes assessed. In stage 1, participants agreed that CIPN screening and assessment should occur at each treatment cycle and continue post-treatment at follow-up visits. They also agreed that patients who report CIPN symptoms should be followed-up to determine symptom severity and impact on daily function and that patient-reported CIPN symptoms assist clinicians in clinically grading neuropathy severity. Three items in this theme did not reach consensus in stage 1: (1) The screening and assessment recommendations in the pathway are appropriate, (2) a short screening tool is appropriate for initial CIPN screening, and (3) a specific staff member should be dedicated to CIPN screening. These items did reach a consensus in stage 2 (Table
2).
The lack of consensus on these points is related to differences in views regarding appropriate assessment tools. One respondent noted that “a short patient-reported questionnaire seems most appropriate for initial screening as both easy and feasible for use in the clinic”. Conversely, another participant suggested, “implementing screening tools into routine care and escalation pathways involving other departments requires institutional buy-in and sufficient resourcing”.
Participants reported which of the health professional(s) should be responsible for CIPN screening and assessment: oncology nursing staff only (32%), medical oncologists and nursing staff (30%), all members of the multi-disciplinary team (e.g., medical oncologists, nursing staff, neurologists, allied health, 21%), medical oncologists only (13%) or neurologists only (5%). One respondent suggested that “regardless of the staff member involved, it is crucial they have experience with CIPN screening”. Another respondent suggested that “there are too many toxicities to screen for, so screening for all toxicities should be shared among clinician and nursing staff”. Some respondents were concerned by the suggestion of having numerous staff members to screen for CIPN, suggesting “if too many staff were involved, it would be challenging to achieve consistency” and “having a dedicated staff member responsible will ensure standardised screening occurs”, while others disagreed, stating that “decentralising screening among trained staff will be more efficient at detecting symptoms earlier and reducing delay for comprehensive assessment”.
Management and referral
The consensus was reached on all 5 items in stage 1 (86–98% agreement). Regarding CIPN management and referral, participants agreed that symptoms resulting from CIPN, including neuropathic pain, balance impairment, and sleep disturbances, may warrant closer monitoring. Participants agreed that symptoms resulting from CIPN require further investigation or referral to other care providers. Participants agreed that patients with functional deficits should be considered for referral to allied health professionals. Participants agreed that patients should be encouraged to be physically active and that education should be provided for safety measures, including thermal management, balance, and foot care. The consensus was also achieved concerning the consideration of referral of patients with worsening or prolonged CIPN symptoms to a neurology service, although one respondent highlighted that “the subtleties of small fibre neuropathy can occur before it becomes clinically apparent, making it challenging to only rely on patients self-reporting symptom changes to trigger the longer assessments”.
Feasibility of the clinical pathway
The consensus was reached on 2/3 items (67%) in stage 1 (73–86% agreement). Participants agreed that implementing the CIPN-path would improve CIPN outcomes for patients and that the proposed pathway should be adapted to each site depending on the needs of the population and the availability of resources. One item did not reach consensus in stage 1, which was that CIPN-path represented a realistic and achievable process. This item did reach consensus in stage 2 (Table
2).
A common theme reported by respondents was potential difficulties with incorporating neurology services into CIPN management, including that “timely access to neurology and NCS is a barrier at some sites”, “routine neurology review may not be helpful, or be feasible, particularly in busy clinics”, and that in rural areas “patients do not have access to publicly available neurologists or specialised allied health professionals”. However, it was also suggested that “patients with a significant risk of developing CIPN should have pre- or early treatment baseline NCS, which can assist to guide treatment and improve the sensitivity of early CIPN diagnosis”.
There was agreement from respondents on the utility of the CIPN-path, including “this pathway which includes an evidence-based approach can support delivering best practice to patients…with many pathways lacking in pre- and posttreatment steps”, “having a clear pathway will help staff and patients be aware of CIPN and the ongoing problems associated with it” and that CIPN is often “poorly addressed from diagnosis, with patients feeling ill-informed with no clear management pathway”.
Discussion
This study aimed to achieve consensus regarding a newly developed clinical pathway that has operationalised CIPN assessment and management advice from current evidence for multidisciplinary health professionals who care for cancer patients treated with neurotoxic chemotherapies. CIPN is significant toxicity of cancer treatment, and screening is needed to minimise symptom burden both during treatment and in cancer survivorship. Accordingly, we assessed the feasibility and clinical utility of a newly developed clinical pathway for screening, assessment, and management of CIPN. Our results highlighted support for enhanced CIPN management in clinical practice to assist teams across different health services to identify CIPN symptoms, aid decision-making, and reduce morbidity from CIPN, as well as identify focus areas for future implementation strategies.
Broadly, the consensus was achieved regarding key aspects of the CIPN-path from most respondents in this study. These included the importance of pretreatment review [
25] and patient education, as well as the timing of CIPN assessments and clarity regarding optimal directions to follow to ensure appropriate and timely referral and relevant management. The proposed clinical pathway allows for both individual and institutional preferences and is not overly prescriptive to aid in uptake. The CIPN-path suggests the initial use of short patient-reported screening questionnaires, with stepped-care escalation to comprehensive questionnaires in symptomatic patients, to trigger the referral and management cascade on an as-needed basis. Centralising care around patient-reported symptoms allows for medical teams to respond in real time and has been shown to reduce hospitalizations and co-morbidities in cancer patients [
26]. Utilising patient-reported outcomes also facilitates patient-clinician communication, which is crucial, particularly in the event where clinicians do not adequately discuss CIPN [
27]. Incorporating patient feedback may identify persisting disability earlier, which is of crucial importance to those who develop functional impairments or become at risk for falls, allowing timely referral to interventions including exercise physiology, physiotherapy, or occupational therapy to improve functional capacity and reduce this burden [
12].
Although we achieved consensus on all elements included in the clinical pathway, in the first round there were four items that failed to achieve consensus. These concerning assessment and screening procedures include the selection of appropriate tools and which personnel should be tasked with CIPN screening. Furthermore, the consensus was not reached on the overall feasibility of the pathway and the appropriateness of the pathway recommendations in the first round. The short screening questionnaires proposed in the CIPN-path have been found to provide adequate screening compared to longer instruments [
28]. Short instruments (< 3 items) were also preferred in a survey of clinicians due to limited resources available in busy oncology clinics [
8]. However, shorter instruments may be limited in terms of comprehensiveness and ability to identify specific concerns and thus may be less acceptable to patients [
29]. There was also a discrepancy among respondents as to which health professional should lead CIPN screening, with mixed responses between nursing, medical oncology, and incorporated throughout the team. Realistically, screening approaches would differ by team structure and resource availability. Clinical pathways have been shown to have the highest likelihood of being successfully implemented when adapted for each setting, which may differ based on staff resourcing, access to services, and synergies with other multi-disciplinary health professionals and departments [
30].
Achieving successful implementation of a clinical pathway and documenting improvements in clinical care remains a key focus which will require additional methods and implementation frameworks to evaluate the clinical utility across health services. A recent study examined the implementation of a CIPN clinician-decision support algorithm into clinical practice, although it did not increase rates of CIPN assessment and adherence to evidence-based management [
19]. Barriers reported by clinicians included lack of time and finding the algorithm a burdensome process, whilst the implementation plan was reported to be sub-optimal [
19]. Importantly, this highlights that implementation frameworks are necessary to identify barriers and seek feedback from key personnel before the successful implementation of improved CIPN assessment and management processes [
31]. Utilising such frameworks, including the consolidated framework for implementation research [
32] or expert recommendations for implementing change [
33], can provide targeted approaches to key implementation barriers. In addition to institutional change, providing sufficient patient education and promoting a trusting relationship with full disclosure of CIPN symptoms has been shown to facilitate clear patient-doctor communication and is pivotal to symptom management [
34]. Patient-reported outcomes have demonstrated a crucial component in identifying symptom severity and facilitating shared decision-making decisions in this context [
35].
The CIPN-path supports CIPN assessment and management before, during, and after neurotoxic treatment, via a multi-disciplinary team, incorporating patient-reported outcome measures and ensuring sufficient flexibility to be adaptable to the needs of healthcare teams across institutions. The CIPN-path supports patient-decision-making, which is particularly important in patient-clinician discussions regarding the risk of worsening CIPN versus the benefit of continuing the same treatment intensity, including the effect on the quality of life [
36]. Clinical pathways for diabetic peripheral neuropathy have also suggested that early identification of neuropathic symptoms, managing comorbidities, and utilising multi-disciplinary care are pivotal in minimising symptom burden and improving clinical outcomes, although are similarly impacted by timely access to specialised resources [
37]. Similar issues were raised in our qualitative analysis regarding timely access to services such as neurology and referral to allied health professionals with experience seeing patients with CIPN. This can be problematic in both urban settings and rural areas. Since delivery of appropriate care after screening is the highest predictor of improvements in patient outcomes [
38], there is a crucial need to include a multi-disciplinary approach. However, while referral to specialised clinical services, including nerve conduction studies, is a component of the CIPN-path, they are not recommended for all patients and must be triaged by priority to avoid overwhelming numbers of referrals. Furthermore, the only pharmacological treatment highlighted in the CIPN-path is duloxetine, which is moderately recommended to treat painful CIPN in the ASCO guidelines [
17]. However, there is less evidence surrounding its efficacy in routine clinical practice [
39], and routine duloxetine use has been shown to be low (< 1%) among patients who received neurotoxic chemotherapy regimens in comparison to other neuropathic pain medications [
40].
The response rate in this study was low (70/260 respondents (27%) in round 1 and 48 respondents in round 2), which may result in non-response bias and represents a limitation of the study. Although this is a common phenomenon in web-based research [
41], it should be considered in the interpretation of our results. Furthermore, because the sample was identified from known networks with expertise in CIPN, responses may be biased in comparison to professionals without such expertise. Therefore, clinical implementation efforts will be essential to demonstrate the feasibility and acceptability of the CIPN-path in routine clinical practice. Our study used free-text responses for participants to provide suggestions, however, our recruited participants did not have the opportunity for cross-disciplinary interactions, such as via a focus group, that may allow for broader interactions of the CIPN-path across multi-disciplinary teams. Furthermore, this study did not include patient decision support frameworks, which would provide an important avenue to support patients and clinicians to operationalise the pathway and its recommendations. Such frameworks have been developed [
36] but require further study to implement and optimize. Strengths of this study include a recruited sample largely represented by health professionals working clinically and specialised in cancer care, and thus in a critical position to comment on clinical management, which was sufficient for a Delphi study [
42].
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