Complete Awareness of Cancer Diagnosis and Prognosis and Its Impact on Survival, Quality of Life, Psychological Outcomes, and End-of-Life Care: A Systematic Review

Abstract

Background: Disclosure of cancer diagnosis and prognosis remains a complex clinical and ethical issue. Although transparent communication may enhance patient autonomy and shared decision-making, concerns remain that complete awareness could increase psychological distress or negatively affect quality of life. Evidence regarding the consequences of diagnostic and prognostic awareness remains inconsistent across cancer types, disease stages, cultural contexts, and definitions of awareness.

Objective: This systematic review aimed to evaluate the associations between complete awareness of cancer diagnosis and/or prognosis and clinical, psychosocial, quality-of-life, decision-making, and end-of-life outcomes among adults with cancer.

Methods: A systematic search of PubMed was conducted using keywords related to cancer, diagnostic disclosure, prognostic awareness, illness understanding, treatment-goal understanding, psychological outcomes, quality of life, survival, hospice utilization, and end-of-life care. Studies involving adult patients with cancer that examined diagnostic or prognostic awareness in relation to clinical or psychosocial outcomes were eligible. Empirical studies were included in the primary synthesis, whereas reviews and conceptual articles were used for contextual interpretation. Due to substantial heterogeneity in study populations, awareness definitions, and outcome measures, findings were synthesized narratively.

Results: Evidence from observational, longitudinal, and interventional studies across diverse geographic regions indicated that diagnostic disclosure was generally not associated with persistent deterioration in quality of life when accompanied by appropriate communication strategies and psychosocial support. Associations between prognostic awareness and outcomes were variable. Several studies reported improved treatment decision-making, advance care planning, hospice utilization, and, in some cases, survival benefits among patients with greater awareness. Conversely, increased anxiety, depressive symptoms, or reduced quality of life were observed in some patients, particularly when awareness was not supported by adequate coping resources, emotional preparation, acceptance, or spiritual well-being.

Conclusion: Available evidence does not support routine nondisclosure of cancer diagnosis or prognosis based on the assumption that awareness is inherently harmful. The impact of awareness appears to be context-dependent and influenced by communication quality, cultural values, coping mechanisms, emotional preparedness, spiritual well-being, and psychosocial support. Disclosure should therefore be individualized, culturally responsive, gradual, and integrated with supportive care approaches.