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Observational Study
. 2021 Aug 17;97(7):e660-e672.
doi: 10.1212/WNL.0000000000012300. Epub 2021 Jun 2.

Prospective Evaluation of Health Care Provider and Patient Assessments in Chemotherapy-Induced Peripheral Neurotoxicity

Collaborators, Affiliations
Observational Study

Prospective Evaluation of Health Care Provider and Patient Assessments in Chemotherapy-Induced Peripheral Neurotoxicity

Paola Alberti et al. Neurology. .

Abstract

Background and objective: There is no agreement on the gold standard for detection and grading of chemotherapy-induced peripheral neurotoxicity (CIPN) in clinical trials. The objective is to perform an observational prospective study to assess and compare patient-based and physician-based methods for detection and grading of CIPN.

Methods: Consecutive patients, aged 18 years or older, candidates for neurotoxic chemotherapy, were enrolled in the United States, European Union, or Australia. A trained investigator performed physician-based scales (Total Neuropathy Score-clinical [TNSc], used to calculate Total Neuropathy Score-nurse [TNSn]) and supervised the patient-completed questionnaire (Functional Assessment of Cancer Treatment/Gynecologic Oncology Group-Neurotoxicity [FACT/GOG-NTX]). Evaluations were performed before and at the end of chemotherapy. On participants without neuropathy at baseline, we assessed the association between TNSc, TNSn, and FACT/GOG-NTX. Considering a previously established minimal clinically important difference (MCID) for FACT/GOG-NTX, we identified participants with and without a clinically important deterioration according to this scale. Then, we calculated the MCID for TNSc and TNSn as the difference in the mean change score of these scales between the 2 groups.

Results: Data from 254 participants were available: 180 (71%) had normal neurologic status at baseline. At the end of the study, 88% of participants developed any grade of neuropathy. TNSc, TNSn, and FACT/GOG-NTX showed good responsiveness (standardized mean change from baseline to end of chemotherapy >1 for all scales). On the 153 participants without neuropathy at baseline and treated with a known neurotoxic chemotherapy regimen, we verified a moderate correlation in both TNSc and TNSn scores with FACT/GOG-NTX (Spearman correlation index r = 0.6). On the same sample, considering as clinically important a change in the FACT/GOG-NTX score of at least 3.3 points, the MCID was 3.7 for TNSc and 2.8 for the TNSn.

Conclusions: MCID for TNSc and TNSn were calculated and the TNSn can be considered a reliable alternative objective clinical assessment if a more extended neurologic examination is not possible. The FACT/GOG-NTX score can be reduced to 7 items and these items correlate well with the TNSc and TNSn.

Classification of evidence: This study provides Class III evidence that a patient-completed questionnaire and nurse-assessed scale correlate with a physician-assessed scale.

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Conflict of interest statement

The authors report no disclosures relevant to the manuscript. Go to Neurology.org/N for full disclosures.

Figures

Figure 1
Figure 1. Comparison Between Total Neuropathy Score, Clinical Version (TNSc) and Total Neuropathy Score, Nurse-Assessed Version (TNSn) at T1
The radius of the bubbles is proportional to the absolute frequency. Spearman correlation index = 88.7%.
Figure 2
Figure 2. Distribution of Deteriorated Functional Assessment of Cancer Treatment/Gynecologic Oncology Group–Neurotoxicity (FACT/GOG-NTX) Items by Total Neuropathy Score, Clinical Version (TNSc) Category
(A) Overall. (B) Patients treated with taxanes. (C) Patients treated with platinum drugs. (D) Patients treated with taxanes + platinum drugs. For all groups, the Kruskal-Wallis test p value was <0.001.
Figure 3
Figure 3. Distribution of Deteriorated Functional Assessment of Cancer Treatment/Gynecologic Oncology Group–Neurotoxicity (FACT/GOG-NTX) Items by Total Neuropathy Score, Nurse-Assessed Version (TNSn) Category
(A) Overall. (B) Patients treated with taxanes. (C) Patients treated with platinum drugs. (D) Patients treated with taxanes + platinum drugs. For all groups, the Kruskal-Wallis test p value was ≤0.001.

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