Rehabilitation Through Prehabilitation Before Complex Cancer Surgery

Abstract

Prehabilitation is increasingly recognized as a pivotal intervention in optimizing the outcomes of patients undergoing complex cancer surgery. This review synthesizes recent evidence concerning the clinical efficacy, mechanisms, and practical application of prehabilitation programs, emphasizing their role in reducing perioperative morbidity, improving functional capacity, and accelerating recovery. The article provides an in-depth analysis of rehabilitation through prehabilitation, addressing epidemiology, underlying mechanisms, and guideline-based recommendations to guide multidisciplinary teams in implementing effective protocols for patients with high surgical risk.

Introduction

The perioperative period in complex oncologic surgery is fraught with significant physiological and psychological stressors, increasing the risk of postoperative complications and delayed recovery. Rehabilitation through prehabilitation—defined as the process of enhancing a patient\'s functional capacity prior to surgery—has emerged as a transformative approach to mitigate this risk. By intervening before the operative insult, healthcare teams can optimize patients\' physical, nutritional, and psychological status, thereby improving surgical outcomes and reducing hospital stay. This review explores the scientific rationale, evidence base, and practical strategies for integrating prehabilitation into cancer care pathways.

Epidemiology / Disease Burden

Globally, cancer remains a leading cause of morbidity and mortality, with millions of new diagnoses annually necessitating surgical intervention. Complex cancer surgeries, such as those for colorectal, hepatobiliary, or lung malignancies, often involve high-risk populations—elderly patients, those with multiple comorbidities, or diminished baseline function. The burden of postoperative complications, including infections, pulmonary dysfunction, and delayed wound healing, is compounded by pre-existing frailty and poor physical fitness. Epidemiological studies consistently demonstrate that up to 50% of high-risk cancer patients experience significant postoperative morbidity, underscoring the urgent need for interventions aimed at risk reduction and enhanced recovery.

Pathophysiology

The pathophysiological impact of major oncologic surgery includes an acute inflammatory response, catabolic stress, and impaired organ function. Surgical trauma triggers a cascade of hormonal and immunological changes, leading to muscle wasting, insulin resistance, and compromised cardiorespiratory reserve. These effects are exacerbated in patients with underlying sarcopenia, poor nutritional status, or pre-existing comorbidities. Prehabilitation leverages the concept of physiological reserve, targeting modifiable risk factors to enhance patients\' resilience to operative stress. Mechanistically, structured exercise and nutritional supplementation modulate inflammatory pathways, improve mitochondrial function, and promote anabolic balance, thereby supporting better perioperative outcomes.

Risk Factors

Risk stratification prior to complex cancer surgery is critical for identifying candidates who may benefit most from prehabilitation. Key modifiable risk factors include reduced cardiorespiratory fitness, malnutrition, frailty, anemia, impaired glycemic control, and psychological distress. Non-modifiable factors such as advanced age, tumor burden, and genetic predisposition also contribute to surgical risk. Comprehensive preoperative assessment tools—such as the American Society of Anesthesiologists (ASA) physical status classification and the Clinical Frailty Scale—are valuable in guiding individualized prehabilitation strategies.

Clinical Features

Patients with diminished preoperative functional capacity often present with reduced exercise tolerance, muscle weakness, fatigue, weight loss, and mood disturbances. These clinical features correlate with increased perioperative morbidity, delayed mobilization, and prolonged hospital stay. Early identification of these features through standardized assessments, including cardiopulmonary exercise testing (CPET) and nutritional screening, is essential for tailoring prehabilitation interventions.

Diagnosis

Diagnosis of functional impairment and surgical risk involves a multimodal approach. Objective measures such as CPET provide insight into cardiorespiratory reserve, while handgrip strength and gait speed assess muscle function and frailty. Nutritional assessment tools, including the Subjective Global Assessment (SGA) and serum albumin levels, identify patients at risk for malnutrition. Psychological evaluation is also integral, as preoperative anxiety and depression can adversely affect recovery. The integration of these diagnostic modalities into preoperative workup enables precise risk stratification and intervention planning.

Treatment & Management

Prehabilitation programs are inherently multidisciplinary, typically encompassing three core components: exercise training, nutritional optimization, and psychological support. Exercise interventions—such as aerobic and resistance training—are tailored to individual capacity, aiming to improve cardiovascular fitness and muscle strength. Nutritional strategies focus on correcting deficits, enhancing protein intake, and addressing micronutrient imbalances. Psychological interventions, including cognitive-behavioral therapy and stress management, target anxiety and depression. The duration and intensity of prehabilitation are individualized based on surgical urgency and patient status, with evidence supporting even short-term interventions for meaningful benefit.

Recent Advances / Emerging Therapies

Recent advances in prehabilitation include the integration of digital health technologies (e.g., wearable trackers, telemonitoring) to facilitate remote patient engagement and adherence. Emerging therapies such as high-intensity interval training (HIIT), immunonutrition, and preoperative inspiratory muscle training have demonstrated efficacy in enhancing physiological reserve and reducing complication rates. Ongoing clinical trials are evaluating multimodal prehabilitation protocols across diverse cancer populations, aiming to refine best practices and expand access.

Guideline Recommendations

International guidelines from bodies such as the Enhanced Recovery After Surgery (ERAS) Society and the American College of Surgeons (ACS) endorse the incorporation of prehabilitation into perioperative care for complex cancer patients. Recommendations emphasize early risk assessment, individualized intervention planning, and multidisciplinary collaboration. Key elements include preoperative exercise, nutritional support, and psychological counseling, with ongoing monitoring and adaptation based on patient progress. Guideline-driven protocols are associated with improved outcomes, reduced readmission rates, and enhanced patient satisfaction.

Conclusion

Rehabilitation through prehabilitation represents a paradigm shift in perioperative oncology, moving from reactive to proactive patient optimization. By addressing functional, nutritional, and psychological deficits prior to complex cancer surgery, clinicians can significantly improve patient resilience, reduce complications, and expedite recovery. The integration of evidence-based prehabilitation protocols into standard care pathways is supported by robust guideline recommendations and emerging clinical data, underscoring its critical role in modern cancer management.