We are delighted to present the Emerging Trends in Cancer Pain Research 2021 article collection. This collection showcases the high-quality work of internationally recognized researchers in the early to mid stages of their research careers. These rising star researchers have been recognized by the Frontiers in Pain Research Editors for their potential to influence the future directions in their respective fields. The work presented here highlights the diversity of research performed across the entire breadth of cancer pain research and presents advances in theory, experimental techniques and methodology along with their application. New articles will be added to this collection as they are published.

University of Milano-Bicocca

University of Maryland

University of Michigan

Northwestern University

Frontiers in Pain Research

Cancer Pain

Emerging Trends in Cancer Pain Research

BackgroundOxycodone hydrochloride is a semisynthetic narcotic analgesic agent. This study aimed to explore optimal titration strategy of controlled-release (CR) oxycodone hydrochloride in patients with cancer pain.</sec>Methods258 patients, who used regular strong opioids (morphine and CR oxycodone hydrochloride) for cancer pain across 25 three grade class hospitals in China during January 15th 2017 to April 30th 2017, were retrospectively studied. The patients were divided into 4 groups according to treatment regimens titrated. The pain remission rate and numeric rating scale (NRS) of cancer pain was recorded at 0, 12, 24, 36, 48, 60, 72 h after opioid titration. The incidence of adverse events (AEs) with therapy were also observed.</sec>Results12 h after treatment, pain remission rate of Group B, C and D was significantly higher (P < 0.001) than Group A. For the complete remission rate, there were also significant differences among the four groups (P < 0.001). No significant difference was found among four groups for pain remission rate at 24, 72 h after treatment. Multiple comparison of NRS scores showed that the both Group B and C varied significantly with Group D (P = 0.028, P = 0.05, respectively), showing superior analgesic effect over Group D. AEs were significantly different among groups (P < 0.01), with the most frequent AEs in Group A, lowest in Group B.</sec>ConclusionThe rapid titration strategy of background CR oxycodone hydrochloride was effectiveness and safety in patients with moderate-to-severe cancer pain.</sec>

Background: Oxycodone hydrochloride is a semisynthetic narcotic analgesic agent. This study aimed to explore optimal titration strategy of controlled-release (CR) oxycodone hydrochloride in patients with cancer pain.Methods: 258 patients, who used regular strong opioids (morphine and CR oxycodone hydrochloride) for cancer pain across 25 three grade class hospitals in China during January 15th 2017 to April 30th 2017, were retrospectively studied. The patients were divided into 4 groups according to treatment regimens titrated. The pain remission rate and numeric rating scale (NRS) of cancer pain was recorded at 0, 12, 24, 36, 48, 60, 72 h after opioid titration. The incidence of adverse events (AEs) with therapy were also observed.Results: 12 h after treatment, pain remission rate of Group B, C and D was significantly higher (P &lt; 0.001) than Group A. For the complete remission rate, there were also significant differences among the four groups (P &lt; 0.001). No significant difference was found among four groups for pain remission rate at 24, 72 h after treatment. Multiple comparison of NRS scores showed that the both Group B and C varied significantly with Group D (P = 0.028, P = 0.05, respectively), showing superior analgesic effect over Group D. AEs were significantly different among groups (P &lt; 0.01), with the most frequent AEs in Group A, lowest in Group B.Conclusion: The rapid titration strategy of background CR oxycodone hydrochloride was effectiveness and safety in patients with moderate-to-severe cancer pain.

The effectiveness and safety of the rapid titration strategy of background controlled-release oxycodone hydrochloride for patients with moderate-to-severe cancer pain: A retrospective cohort study

IntroductionCancer pain is one of the most important deleterious and distressing symptoms suffered by patients with cancer which disturb their quality of life, especially in the last part of their life. Alleviating pain is a primary goal of prognosis of cancer pain management and pain symptoms must be prevented, treated as a priority, and considered an independent part of cancer management. Despite the presence of guidelines for cancer pain management, many patients with cancer are still undertreated. Therefore, this study aimed to assess factors associated with adherence to guidelines in cancer pain management among adult patients evaluated at the oncology unit, in the University of Gondar Comprehensive Specialized Hospital (UoGCSH), Northwest Ethiopia.</sec>MethodsAn institution-based cross-sectional study was conducted from January to March 2021. All patients who were in cancer treatment were our population of interest. A systematic random sampling technique was used to select a total of 384 participants. The dependent variable of the study was adherence to guidelines in cancer pain management. It was determined using the pain management index (PMI) which was calculated by subtracting the pain level from the analgesics level. A negative range was considered an indicator of poor adherence to guidelines in cancer pain management. Bivariable and multivariable binary logistic regression analyses were performed. Adjusted odds ratio (AOR) with a 95% CI was used as a measure of association. Variables having P < 0.05 from the multivariable analysis were considered to have a significant association with the outcome.</sec>ResultsThe prevalence of poor adherence to guidelines in cancer pain management among 384 adult patients in this study was 21.35% (95%CI: 17.53, 25.76). Patients who were not married [AOR = 2.2; 95%CI: 1.15, 4.19], who know their diagnosis before 4 months ago [AOR = 0.53; 95%CI: 0.26, 0.96], who have metastasis cancer [AOR = 3.76; 95%CI: 1.83, 7.72], and being stage III patients [AOR = 3.21; 95%CI: 1.64, 7.93] and stage IV patients [AOR = 1.63; 95%CI: 1.09, 5.81], respectively, had a significant association with poor adherence to guidelines in cancer pain management.</sec>ConclusionThe prevalence of poor adherence to guidelines in cancer pain management among adult patients with cancer in UoGCSH Northwest Ethiopia is relatively low as compared with other studies. Factors such as patients who were not married and who have metastasis cancer, and being patients with stage III and stage IV cancer had a significant positive association with poor adherence to guidelines in cancer pain management, on the other hand, patients who know their diagnosis 4 months ago had a positive association with having adherence to guidelines in cancer pain management. Patients with high stage and metastasis need care from pain specialists early on in the diagnosis of pain. The hospital should reassure the diagnosis of cancer for the patient before they started the treatment.</sec>

Introduction: Cancer pain is one of the most important deleterious and distressing symptoms suffered by patients with cancer which disturb their quality of life, especially in the last part of their life. Alleviating pain is a primary goal of prognosis of cancer pain management and pain symptoms must be prevented, treated as a priority, and considered an independent part of cancer management. Despite the presence of guidelines for cancer pain management, many patients with cancer are still undertreated. Therefore, this study aimed to assess factors associated with adherence to guidelines in cancer pain management among adult patients evaluated at the oncology unit, in the University of Gondar Comprehensive Specialized Hospital (UoGCSH), Northwest Ethiopia.Methods: An institution-based cross-sectional study was conducted from January to March 2021. All patients who were in cancer treatment were our population of interest. A systematic random sampling technique was used to select a total of 384 participants. The dependent variable of the study was adherence to guidelines in cancer pain management. It was determined using the pain management index (PMI) which was calculated by subtracting the pain level from the analgesics level. A negative range was considered an indicator of poor adherence to guidelines in cancer pain management. Bivariable and multivariable binary logistic regression analyses were performed. Adjusted odds ratio (AOR) with a 95% CI was used as a measure of association. Variables having P &lt; 0.05 from the multivariable analysis were considered to have a significant association with the outcome.Results: The prevalence of poor adherence to guidelines in cancer pain management among 384 adult patients in this study was 21.35% (95%CI: 17.53, 25.76). Patients who were not married [AOR = 2.2; 95%CI: 1.15, 4.19], who know their diagnosis before 4 months ago [AOR = 0.53; 95%CI: 0.26, 0.96], who have metastasis cancer [AOR = 3.76; 95%CI: 1.83, 7.72], and being stage III patients [AOR = 3.21; 95%CI: 1.64, 7.93] and stage IV patients [AOR = 1.63; 95%CI: 1.09, 5.81], respectively, had a significant association with poor adherence to guidelines in cancer pain management.Conclusion: The prevalence of poor adherence to guidelines in cancer pain management among adult patients with cancer in UoGCSH Northwest Ethiopia is relatively low as compared with other studies. Factors such as patients who were not married and who have metastasis cancer, and being patients with stage III and stage IV cancer had a significant positive association with poor adherence to guidelines in cancer pain management, on the other hand, patients who know their diagnosis 4 months ago had a positive association with having adherence to guidelines in cancer pain management. Patients with high stage and metastasis need care from pain specialists early on in the diagnosis of pain. The hospital should reassure the diagnosis of cancer for the patient before they started the treatment.

Factors associated with adherence to guidelines in cancer pain management among adult patients evaluated at oncology unit, in the University of Gondar Comprehensive Specialized Hospital, Northwest Ethiopia

Chemotherapy-induced peripheral neuropathy (CIPN) is a highly prevalent and complex condition arising from chemotherapy cancer treatments. Currently, there are no treatment or prevention options in the clinic. CIPN accompanies pain-related sensory functions starting from the hands and feet. Studies focusing on neurons in vitro and in vivo models significantly advanced our understanding of CIPN pathological mechanisms. However, given the direct toxicity shown in both neurons and non-neuronal cells, effective in vivo or in vitro models that allow the investigation of neurons in their local environment are required. No single model can provide a complete solution for the required investigation, therefore, utilizing a multi-model approach would allow complementary advantages of different models and robustly validate findings before further translation. This review aims first to summarize approaches and insights from CIPN in vivo models utilizing small model organisms. We will focus on Drosophila melanogaster CIPN models that are genetically amenable and accessible to study neuronal interactions with the local environment in vivo. Second, we will discuss how these findings could be tested in physiologically relevant vertebrate models. We will focus on in vitro approaches using human cells and summarize the current understanding of engineering approaches that may allow the investigation of pathological changes in neurons and the skin environment.

Chemotherapy-induced peripheral neuropathy (CIPN) is a highly prevalent and complex condition arising from chemotherapy cancer treatments. Currently, there are no treatment or prevention options in the clinic. CIPN accompanies pain-related sensory functions starting from the hands and feet. Studies focusing on neurons in vitro and in vivo models significantly advanced our understanding of CIPN pathological mechanisms. However, given the direct toxicity shown in both neurons and non-neuronal cells, effective in vivo or in vitro models that allow the investigation of neurons in their local environment are required. No single model can provide a complete solution for the required investigation, therefore, utilizing a multi-model approach would allow complementary advantages of different models and robustly validate findings before further translation. This review aims first to summarize approaches and insights from CIPN in vivo models utilizing small model organisms. We will focus on Drosophila melanogaster CIPN models that are genetically amenable and accessible to study neuronal interactions with the local environment in vivo. Second, we will discuss how these findings could be tested in physiologically relevant vertebrate models. We will focus on in vitro approaches using human cells and summarize the current understanding of engineering approaches that may allow the investigation of pathological changes in neurons and the skin environment.

Cellular Pathogenesis of Chemotherapy-Induced Peripheral Neuropathy: Insights From Drosophila and Human-Engineered Skin Models

Chemotherapy induced peripheral neuropathy (CIPN) is an often severe and debilitating complication of multiple chemotherapeutic agents that can affect patients of all ages, across cancer diagnoses. CIPN can persist post-therapy, and significantly impact the health and quality of life of cancer survivors. Identifying patients at risk for CIPN is challenging due to the lack of standardized objective measures to assess for CIPN. Furthermore, there are no approved preventative treatments for CIPN, and therapeutic options for CIPN remain limited once it develops. Biomarkers of CIPN have been studied but are not widely used in clinical practice. They can serve as an important clinical tool to identify individuals at risk for CIPN and to better understand the pathogenesis and avenues for treatment of CIPN. Here we review promising biomarkers of CIPN in humans and their clinical implications.

Chemotherapy induced peripheral neuropathy (CIPN) is an often severe and debilitating complication of multiple chemotherapeutic agents that can affect patients of all ages, across cancer diagnoses. CIPN can persist post-therapy, and significantly impact the health and quality of life of cancer survivors. Identifying patients at risk for CIPN is challenging due to the lack of standardized objective measures to assess for CIPN. Furthermore, there are no approved preventative treatments for CIPN, and therapeutic options for CIPN remain limited once it develops. Biomarkers of CIPN have been studied but are not widely used in clinical practice. They can serve as an important clinical tool to identify individuals at risk for CIPN and to better understand the pathogenesis and avenues for treatment of CIPN. Here we review promising biomarkers of CIPN in humans and their clinical implications.