A new landscape in illness uncertainty: A systematic review and thematic synthesis of the experience of uncertainty in patients with advanced cancer receiving immunotherapy or targeted therapy.

OBJECTIVE: Over the past 20 years, immunotherapy and targeted therapy (TT) have been extending the life expectancy and providing hope for a growing number of patients with advanced and metastatic cancer. However, the efficacy, side effects, and overall prognosis of these treatments are highly unpredictable. Recent research suggests that these patients may be experiencing significant uncertainty which impacts their functioning. This study reviewed the literature on the experiences of uncertainty for individuals with advanced or metastatic cancer patients who are receiving immunotherapy or TT.

METHOD: A systematic literature review was conducted. Data was extracted from studies by pairs of reviewers. Literature quality was appraised using the Critical Appraisal Skills Program checklist. Following data extraction, thematic synthesis was used to summarize findings across studies and generate overarching themes.

RESULTS: Fifteen qualitative studies were included. Findings highlighted impacts of various sources of uncertainty (financial, emotional, social), unmet needs related to uncertainty (practical, informational, communication), and recommendations for the management of uncertainty. Clinical implications and study limitations were indicated.

CONCLUSIONS: Findings were situated within Mishel's Uncertainty in Illness Theory and the literature on supportive care for advanced cancer populations. Recommendations related to improving healthcare provider communication and balancing hope and expectations for treatment outcomes were highlighted. Further research is needed to investigate experiences of uncertainty in this population. Tailored interventions for uncertainty may be warranted.