The goal of this clinical study is to evaluate a new process for assessing and alleviating chemotherapy-induced peripheral neuropathy in the feet in patients treated with chemotherapy for early stage breast cancer. It will also compare two orthopedic interventions for symptom relief. The main questions it aims to answer are:

Can an orthopedic silicone orthosis reduce chemotherapy-induced peripheral neuropathy symptoms in the feet? How does the effectiveness of the silicone orthosis compare to standard orthopedic treatment with insoles and shoes?

Participants will:

Use either a silicone orthosis or standard orthopedic treatment Have contact with the clinic for assessments and follow-ups Report their symptoms and functional improvements over time

Background and Rationale

This study aims to develop and evaluate a structured multidisciplinary rehabilitation process for assessing and managing chemotherapy-induced peripheral neuropathy in the feet. The project establishes a new collaboration between the Oncology Department and the Department of Orthopedic Technology at Sahlgrenska University Hospital, integrating an orthopedic approach into cancer rehabilitation.

Chemotherapy-induced peripheral neuropathy is a common side effect of chemotherapy, affecting 50-90% of patients undergoing cancer treatment. Symptoms such as numbness, tingling, pain, and sensory loss in the feet can lead to chronic discomfort, impaired balance, and reduced quality of life. Despite its prevalence, there are no standardized guidelines for grading or managing chemotherapy-induced peripheral neuropathy within rehabilitation. Additionally, structured follow-up for chemotherapy-induced peripheral neuropathy after chemotherapy is lacking in Sweden, and there are limited effective treatment options available.

This research project aims to develop a structured process for assessing and managing chemotherapy-induced peripheral neuropathy in the feet and to evaluate two orthopedic interventions:

• Current standard treatment - customized insoles and orthopedic shoes.
• A novel intervention - a silicone orthosis, designed as a soft, sock-like device for indoor use.

Although silicone orthoses have been introduced in limited clinical settings in Sweden, their effectiveness for chemotherapy-induced peripheral neuropathy remains untested. This study seeks to evaluate whether this new intervention can alleviate symptoms and improve mobility and quality of life for breast cancer patients experiencing chemotherapy-induced peripheral neuropathy .

Study Objectives

The overall aim is to establish and evaluate a new process for assessing and alleviating symptoms in the feet through orthopedic technology. Specifically, the study will:

• Compare the effectiveness of two orthopedic interventions (custom insoles vs. silicone orthosis).
• Investigate patient-reported outcomes regarding symptom relief, quality of life, and functional mobility.

Study Design and Methodology The study consists of a pilot phase with, followed by a potential randomized controlled trial if preliminary results are promising. This pilot study will include 40 participants, divided equally between the two intervention groups. It is conducted at Sahlgrenska University Hospital, involving a multidisciplinary collaboration between the Oncology Department and the Orthopedic Technology Department .

Step 1: Diagnosis and Assessment Patients with chemotherapy-induced peripheral neuropathy in the lower extremities (feet) following breast cancer treatment will be assessed using a standardized grading system based on the Common Terminology Criteria for Adverse Events as well as a symptom questionnaire. Patients will also complete self-reported quality-of-life assessments as well as the EQ-5D scale and undergo 3D foot scanning to measure foot morphology and structural differences compared to the general population. Medical records will be reviewed to collect demographic and clinical variables (age, cancer status, chemotherapy regimen, comorbidities, smoking status, Body Mass Index).

Step 2: Orthopedic Interventions

Patients will be randomly assigned to one of two intervention groups:

Group 1: Receives customized orthopedic insoles and shoes, the current standard treatment for diabetic neuropathy.

Group 2: Receives a silicone orthosis, a novel sock-like support designed for indoor use.

All participants will receive guidance on footwear selection and be provided with seamless socks to minimize pressure on sensitive areas.

All patients will also be examined with

• D-Foot: A validated and reliable instrument for structured foot examination, primarily used in diabetic foot assessments.
• 3D foot scanning (Volumental scanner): Provides highly accurate foot measurements with a ±1 mm error margin.

Step 3: Activity Monitoring

To objectively assess mobility and functional changes, patients will wear an activity tracker (Active Pal) attached to their leg using skin-friendly tape for two weeks. The device records data on:

• Time spent sitting, standing, walking, or lying down.
• Step count and movement patterns. Patients in the silicone orthosis group will also maintain a daily usage diary to document how often they wear the device.

Step 4: Follow-Up and Outcome Evaluation

Follow-up assessments will occur 3-6 weeks post-intervention, conducted by oncology nurse or doctor via:

• Repeat symptom grading (CTCAE).
• Self-reported questionnaires on foot health and quality of life.
• Semistructured interviews evaluating patients' experiences with their assigned intervention.

Interviews will explore:

• Perceived symptom relief and comfort.
• Impact on daily activities and mobility.
• Satisfaction with the provided intervention.
• The follow-up can be conducted in person, via phone, or digitally and is estimated to take approximately 45 minutes.

Scientific Questions

The study aims to answer the following key research questions:

• What is the prevalence and severity of chemotherapy-induced peripheral neuropathy in the feet among the patients?
• How does chemotherapy-induced peripheral neuropathy affect self-reported quality of life (EQ-5D scores)?
• What is the foot status (e.g., structural and functional characteristics) in affected patients?
• Are there foot morphology differences between chemotherapy-induced peripheral neuropathy patients and the general female population?
• Does the type of orthopedic aid influence activity levels and mobility?
• How does chemotherapy-induced peripheral neuropathy impact patients' daily lives?
• Are there differences in patient experience and perceived effectiveness between the two orthopedic interventions?

Expected Impact

If successful, this study will:

• Provide new insights into the effectiveness of orthopedic aids for chemotherapy-induced peripheral neuropathy -related foot symptoms.
• Establish a structured assessment process for chemotherapy-induced peripheral neuropathy in oncology rehabilitation.
• Improve patient quality of life by offering evidence-based interventions for symptom relief.
• Lay the groundwork for a larger randomized controlled trial to confirm findings and influence future clinical guidelines.

By bridging the gap between oncology and orthopedic technology, this project aims to enhance rehabilitation strategies for cancer survivors dealing with long-term neuropathic complications.

Inclusion Criteria:

• Patients with breast cancer receiving treatment at the Oncology Department, Sahlgrenska University Hospital (SU).
• Have undergone treatment with taxanes.
• Aged 18 years or older.
• Able to understand spoken and written Swedish.
• Patients who can ambulate with or without assistive walking devices.
• CTCAE grading above 2 at a medical visit after completing treatment.

Exclusion Criteria:

• Bilateral amputation at the thigh level.
• Previously diagnosed neurological disease or neurological impairment affecting the feet.