Pain Experience in Oncology: A Targeted Literature Review and Development of a Novel Patient-Centric Conceptual Model

Typical endpoints in cancer clinical trials focus on standardized efficacy endpoints, such as overall survival. Pain is not always assessed, although it is a highly prevalent and distressing aspect of patients' cancer experience and plays a critical role in health-related quality of life. To inform future pain measurement strategies in oncology, this targeted literature review of pain-related qualitative publications in oncology aimed to characterize and explore the patient experience of pain, and its impact on how patients feel and function.

A review of publications in MEDLINE, Embase and PsycINFO from 2018 to 2023 was conducted. Patient quotes or author descriptions/interpretations were extracted and analyzed with directed content analysis techniques, using ATLAS.ti v9. Data were synthesized to inform the development of a conceptual model.

Twenty-eight publications, with data from 534 patients across different oncology indications and geographies, were reviewed. Pain was triggered by disease symptoms and treatment, including surgical procedures, chemotherapy, and radiation. Pain was most often daily, severe, and chronic in nature. Characterizations of pain varied, but most often "sharp"/"stabbing"/"shooting" pain was described across different treatment stages. Pain had an extensive impact on emotional wellbeing, activities of daily living, physical, physiological and social functioning, sleep and work. Unmet needs included difficulty communicating pain needs to healthcare practitioners and fear/distrust of opioid pain medication.

This research provides a patient-centric model conceptualizing the patient experience of cancer-related pain. The findings highlight the burden and all-encompassing impact of cancer-related pain, demonstrating the importance of assessing pain in oncology clinical trials.