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. 2019 Jan;35(1):37-42.
doi: 10.1097/AJP.0000000000000649.

Contribution of Loss of Large Fiber Function to Pain in 2 Samples of Oncology Patients

Christine Miaskowski  1 , Steven M Paul  1 , Judy Mastick  1 , Gary Abrams  2 , Kimberly Topp  2 , Betty Smoot  2 , Kord M Kober  1 , Margaret Chesney  2 , Mark Schumacher  2 , Yvette P Conley  3 , Marilyn Hammer  4 , Steven Cheung  2 , David Borsook  5   6 , Jon D Levine  2   7
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Contribution of Loss of Large Fiber Function to Pain in 2 Samples of Oncology Patients

Christine Miaskowski et al. Clin J Pain. 2019 Jan.

Abstract

Objectives: Numbness associated with neuropathic pain suggests the loss of function in myelinated, large diameter sensory neurons. The purpose of this study was to examine the relationships between pain severity and subjective (ie, severity of numbness) and objective (ie, loss of light touch sensations, vibration thresholds) measures of loss of large fiber function in adult survivors with chemotherapy-induced peripheral neuropathy (CIPN, n=426) and breast cancer patients with persistent postsurgical pain (n=80).

Material and methods: For both samples, average pain and numbness were evaluated using a 0 to 10 numeric rating scale. Loss of light touch sensations in the hands and feet of patients with CIPN and in the upper arm of patients at 5 and 6 months following breast cancer surgery were assessed using Semmes Weinstein monofilaments. Loss of vibration in the hands and feet of patients with CIPN was assessed using a biothesiometer. Pearson Product Moment correlation coefficients were calculated between average pain and the number or percentage of sites with loss of light touch sensations, mean vibration thresholds, and the severity of numbness.

Results: For both pain conditions, average pain scores were significantly correlated with objective measures of large fiber function (r=0.12 to 0.34; all P<0.05) and numbness (r=0.22 to 0.52; all P<0.008).

Discussion: Our findings, in 2 independent samples of oncology patients, suggest that loss of function of myelinated, large diameter fibers contributes to the severity of neuropathic pain.

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Conflict of interest statement

Conflicts of Interest: The authors have no conflicts of interest to declare.

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