"EXHALE": exercise as a strategy for rehabilitation in advanced stage lung cancer patients: a randomized clinical trial comparing the effects of 12 weeks supervised exercise intervention versus usual care for advanced stage lung cancer patients

Prehabilitation for Older Adults Undergoing Lung Cancer Surgery: A Literature Review and Needs Assessment

Early-stage lung cancer patients are increasingly considered for preoperative systemic therapy. Older adults in particular are among the most vulnerable patients, with little known on how preoperative therapies affect the risk-benefit of surgery. We sought to summarize the current literature and elucidate existing evidence gaps on the effects of prehabilitation interventions relative to age-related functional impairments and the unique needs of older patients undergoing lung cancer surgery. A literature review was performed using PubMed and Google Scholar databases, of all scientific articles published through April 2022 which report on the effects of prehabilitation on patients undergoing lung cancer surgery. We extracted current prehabilitation protocols and their impact on physical functioning, resilience, and patient-reported outcomes of older patients. Emerging evidence suggests that prehabilitation may enhance functional capacity and minimize the untoward effects of surgery for patients following lung resection similar to, or potentially even better than, traditional postoperative rehabilitation. The impact of preoperative interventions on surgical risk due to frailty remains ill-defined. Most studies evaluating prehabilitation include older patients, but few studies report on activities of daily living, self-care, mobility activities, and psychological resilience in older individuals. Preliminary data suggest the feasibility of physical therapy and resilience interventions in older individuals concurrent with systemic therapy. Future research is needed to determine best prehabilitation strategies for older lung cancer patients aimed to optimize age-related impairments and minimize surgical risk.

Physiotherapy applied to palliative care patients: a descriptive practice-based study

BACKGROUND

Over the last few years, the presence of physiotherapists in Palliative Care Units (PCU) has considerably grown based on evidence from studies supporting the use of non-pharmacological measures as part of Palliative Care (PC) treatments. However, more accumulated data are needed to definitively establish its added value. The present study describes the type of patients receiving physiotherapy in a PCU and the benefits obtained in relation to their degree of functional dependence.

METHODS

An observational, prospective, descriptive, practice-based study was undertaken involving patients admitted to the PCU of Fundación Instituto San José (Madrid, Spain), who according to the PCU´s clinical practice, met the criteria for physiotherapy intervention. Daily clinical practice was unchanged for study reasons. Participants were assessed prior to initiating and at the end of the physiotherapy program using the following standard scales: the Barthel Index, the Functional Ambulation Categories scale, the Palliative Performance Scale, and the Braden scale. A descriptive analysis was performed and scale scores prior to and after treatment were compared using the Wilcoxon signed-rank test. Significance was set at 0.05.

RESULTS

A total of 63 patients were included (mean age 71.98 ± 12.72; 61.9% males). Fifty-eight patients (92.1%) were oncological patients; of them, 35 (60.3%) had metastases. Prior to treatment, 28 (44.4%) participants had total dependence according to the Barthel index, and 37 (58.7%) were non-functional ambulator according to the FAC scale. At the end of treatment, the number of patients with total dependence decreased to 15 (23.8%) and those non-functional ambulator to 12 (19.0%).

CONCLUSIONS

Patients who benefited from physical therapy during their admission to our PCU were predominantly males with oncological processes, mainly lung cancer. PC including physiotherapy improved their functionality, independence and skills for activities of daily living in this sample of PCU patients.

Experiences of cancer rehabilitation among patients in rural areas in northern Iceland: physical and psychosocial well-being, coping, quality of life, and satisfaction with care. A qualitative study

Physical rehabilitation and psychosocial support are a part of cancer patients well-being and their ability to cope. Physical geography and healthcare provider barriers may have negative influences on patients' health outcomes. To explore the perceptions and experiences of cancer rehabilitation in a rural area in northern Iceland. A further aim was to explore patients' physical and psychosocial well-being, coping and satisfaction with care. A qualitative study using semi-structured interviews and thematic analysis was completed with a purposive sample of 21 patients at a tertiary hospital in northern Iceland. Three main themes emerged: 1) Rehabilitation - the need for improved access support and continuity; 2) Coping and quality of life - balancing life as it was before cancer against the present situation in order to achieve normality; 3) Satisfaction - encountering caring behaviours enhances satisfaction and well-being. Specifically targeted rehabilitation programmes need to be included in the treatment options for cancer patients. Survival instinct, coping mechanisms and a strong urge to maintain general functionality are of paramount importance intertwined with patients' ability to cope with the disease and treatment, and their satisfaction with care.

Physiologic and psychologic adaptation to exercise interventions in lung cancer patients undergoing chemotherapy: a systematic review and meta-analysis of randomized controlled trials

OBJECTIVE

The purpose of this meta-analysis is to investigate the effectiveness of exercise interventions in patients with lung cancer (LC) during chemotherapy regarding physiological and psychological outcomes.

METHODS

Databases including MEDLINE and EMBASE were used to find relevant randomized controlled trails that explored outcomes of exercise interventions for patients with LC during chemotherapy up to June 2020. Effect sizes were calculated by standardized mean difference statistics.

RESULTS

Six studies were included that involved 244 participants with average age of 65 years. Patients with LC participating in exercise interventions during chemotherapy had significantly increased strength, forced expired volume, and quality of life as well as significantly decreased pain. Effective exercise intervention characteristics were combined aerobic and resistance exercise, performance more than 5 times a week, moderate to vigorous intensity, and 1-h sessions.

CONCLUSION

Supervised participation in exercise improves strength, forced expired volume, and quality of life and relieves pain and depression during chemotherapy.

Exercise training as part of lung cancer therapy

Exercise training is playing an increasing role in lung cancer care. Lung cancer is associated with significant burden to the individual and healthcare system. There is now substantial evidence that exercise training is safe, feasible and effective at improving several outcomes in people with lung cancer, especially in those with NSCLC. Exercise is beneficial across the lung cancer disease and treatment pathway, including in patients with early stage disease before and after surgery, and in patients with advanced disease. This review describes the impact of lung cancer and lung cancer treatment on patient health outcomes and summarizes the aims, safety, feasibility and effects of exercise training in the context of both early stage and advanced stage lung cancer. The paper also includes a discussion of current topical discussion areas including the use of exercise in people with bone metastases and the potential effect of exercise on suppression of tumour growth. Finally, seven clinical questions are included, which are a priority to be addressed by future research over the next decade as we strive to progress the field of lung cancer and improve patient outcomes.

Effects of an exercise intervention for patients with advanced inoperable lung cancer undergoing chemotherapy: A randomized clinical trial

OBJECTIVE

Exercise can improve treatment-related side effects, quality of life, and function in patients with various types of cancer; however, more evidence is needed for patients with advanced inoperable lung cancer.

MATERIAL AND METHODS

We randomized 218 patients with advanced inoperable lung cancer to a 12-week supervised, structured exercise training program (aerobic, strength, and relaxation training) twice weekly versus usual care. Primary outcome was change in maximal oxygen uptake (VO₂ peak). Secondary outcomes were muscle strength, functional capacity, forced expiratory volume in 1 s, health-related quality of life, anxiety, and depression.

RESULTS

There was no significant difference between the intervention and control groups in VO₂ peak. There was a significant improvement in muscle strength. There was also a significant difference between the two for social well-being (Functional Assessment of Cancer Therapy-Lung, FACT-L), anxiety, and depression.

CONCLUSION

There was a significant reduction in the level of anxiety and depression and a significant increase in all muscle strength outcomes in the intervention group compared to patients randomized to usual care. There was a significant difference between the groups for social well-being. The primary outcome did not show a significant improvement in VO₂ peak. Based on our results, future patients with advanced inoperable lung cancer should be considered for supervised exercise during the course of their disease.

Exercise experiences in patients with metastatic lung cancer: A qualitative approach

Background

Patients with metastatic lung cancer can have severe cancer-related symptoms and treatment-induced side effects. Exercise is beneficial for patients with metastatic lung cancer; however, little information is available on guiding patients how to perform exercise during hospitalization. The purpose of this qualitative study was to understand exercise experiences in patients with metastatic lung cancer.

Methods

Patients with metastatic lung cancer (n = 24) participated in face-to-face in-depth interviews at an inpatient ward of a medical center in central Taiwan. Interview transcripts were evaluated using narrative analysis to extract and validate themes.

Results

Three primary themes were identified: (1) modifying exercise to maximize physical functions; (2) living with symptoms and frustration, but still exercising; and (3) doing exercise to sustain hopes, inner power, and life. Secondary findings included: (1) adopting walking as their main form of exercise because of its convenience; and (2) among patients with severe symptoms, adjusting exercise towards shorter time durations and shorter distances, slower speeds, and higher frequencies.

Conclusions

The study found physically active lung cancer patients, although with metastatic condition, adjusted their exercise activities to balance disease and treatment-induced deteriorations and boost themselves to feel hope and fight for cancer. However, the results may not be applicable to physically inactive patients. Future research to explore experiences from those with even worse physical conditions and further helping them to take some mild exercise to enhance the positive side of cancer experiences are suggested.

Chronic Obstructive Pulmonary Disease and Lung Cancer: Underlying Pathophysiology and New Therapeutic Modalities

Chronic obstructive pulmonary disease (COPD) and lung cancer are major lung diseases affecting millions worldwide. Both diseases have links to cigarette smoking and exert a considerable societal burden. People suffering from COPD are at higher risk of developing lung cancer than those without, and are more susceptible to poor outcomes after diagnosis and treatment. Lung cancer and COPD are closely associated, possibly sharing common traits such as an underlying genetic predisposition, epithelial and endothelial cell plasticity, dysfunctional inflammatory mechanisms including the deposition of excessive extracellular matrix, angiogenesis, susceptibility to DNA damage and cellular mutagenesis. In fact, COPD could be the driving factor for lung cancer, providing a conducive environment that propagates its evolution. In the early stages of smoking, body defences provide a combative immune/oxidative response and DNA repair mechanisms are likely to subdue these changes to a certain extent; however, in patients with COPD with lung cancer the consequences could be devastating, potentially contributing to slower postoperative recovery after lung resection and increased resistance to radiotherapy and chemotherapy. Vital to the development of new-targeted therapies is an in-depth understanding of various molecular mechanisms that are associated with both pathologies. In this comprehensive review, we provide a detailed overview of possible underlying factors that link COPD and lung cancer, and current therapeutic advances from both human and preclinical animal models that can effectively mitigate this unholy relationship.

Better lung function with increased handgrip strength, as well as maximum oxygen uptake, in congenital heart disease across the lifespan

Background

The respiratory benefits of muscle strength are well-known in heart-healthy populations, but recommendations and research often focus instead on aerobic fitness (peak oxygen uptake) or total activity. Independent benefits of strength thus may be underestimated, especially in congenital heart disease where perceived dangers of certain types of exercise may outweigh perceived benefits. To assess whether it is plausible that pulmonary benefits of strength in heart-healthy populations also apply in congenital heart disease, we simultaneously correlated these patients’ lung function with fitness, strength, and cardiac diagnosis.

Methods

Lung function (forced expiratory volume in one second percentage predicted (FEV1%pred)) was modeled as function of handgrip strength, congenital heart disease diagnosis, peak oxygen uptake and the interactions of handgrip with sex and diagnosis in 538 Germans (58% male, ages 6–82 years) in linear models corrected for age, sex, height and weight. Congenital heart disease diagnoses were: complex cyanotic; Fallot/Truncus arteriosus communis (common arterial trunk) (TAC); shunts; transposition of the great arteries (TGA); left heart; and other/none.

Results

Each kg of handgrip was associated with 0.74% higher FEV1%pred ( p < 0.001) and handgrip explained almost 10% of variance in FEV1%pred. While some groups had higher FEV1%pred than others ( p for global null <0.0001), all experienced similar associations with strength ( p for interaction with handgrip >0.10 for both sex and diagnosis.) Correction for peak oxygen uptake eliminated the association with congenital heart disease, but not handgrip.

Conclusion

Strength was associated with better lung function in all ages even after correction for peak oxygen uptake, regardless of sex and congenital heart disease. This suggests that strength may be at least as important for lung function as aerobic fitness. Heart-safe strength training may improve pulmonary function in congenital heart disease.

Feasibility of an eight-week outpatient-based pulmonary rehabilitation program for advanced lung cancer patients undergoing cytotoxic chemotherapy in Korea

The scientific evidence supporting pulmonary rehabilitation (PR) for lung cancer patients undergoing cytotoxic chemotherapy is accumulating; however, the feasibility of outpatient-based PR in these patients has not yet been evaluated in Korea. We conducted an eight-week outpatient-based PR feasibility study in a tertiary referral hospital setting. Patients with advanced lung cancer (non-small cell lung cancer IIIB-IV and small-cell lung cancer extensive disease) scheduled to undergo first-line cytotoxic chemotherapy underwent PR consisting of 60-minute sessions twice a week under the guidance and supervision of a physical therapist, for a total of eight weeks. Feasibility was assessed based on completion of the PR program. In total, 12 patients (median age 68 years) were enrolled; 11 (91.7%) were male with a history of smoking. Among these 12 patients, 9 (75%) completed the eight-week outpatient-based PR program. Three patients could not complete the PR program: two were unwilling and one died from complications of lung cancer. This study showed a 75% completion rate of an eight-week outpatient-based PR program for advanced lung cancer patients undergoing cytotoxic chemotherapy, which supports its feasibility.

Handgrip strength is associated with improved spirometry in adolescents

Introduction

Pulmonary rehabilitation, including aerobic exercise and strength training, improves function, such as spirometric indices, in lung disease. However, we found spirometry did not correlate with physical activity (PA) in healthy adolescents (Smith ERJ: 42(4), 2016). To address whether muscle strength did, we measured these adolescents’ handgrip strength and correlated it with spirometry.

Methods

In 1846 non-smoking, non-asthmatic Germans (age 15.2 years, 47% male), we modeled spirometric indices as functions of handgrip strength by linear regression in each sex, corrected for factors including age, height, and lean body mass.

Results

Handgrip averaged 35.4 (SD 7.3) kg in boys, 26.6 (4.2) in girls. Spirometric volumes and flows increased linearly with handgrip. In boys each kg handgrip was associated with about 28 mL greater FEV1 and FVC; 60 mL/sec faster PEF; and 38 mL/sec faster FEF2575. Effects were 10–30% smaller in girls (all p<0.0001) and stable when Z-scores for spirometry and grip were modeled, after further correction for environment and/or other exposures, and consistent across stages of puberty.

Conclusions

Grip strength was associated with spirometry in a cohort of healthy adolescents whose PA was not. Thus, research into PA’s relationship with lung function should consider strength as well as total PA. Strength training may benefit healthy lungs; interventions are needed to prove causality.

Exercise behavior and physical fitness in patients with advanced lung cancer

PURPOSE

The aim of this work was to evaluate exercise behavior and physical fitness of advanced lung cancer patients shortly after primary diagnosis.

METHODS

Between November 2013 and December 2016, advanced lung cancer patients (n = 227, mean age 62.2 years) were enrolled shortly after diagnosis and 211 patients were tested for endurance capacity (six-minute walk test) and strength performance (maximum voluntary isometric contraction of upper and lower extremities). Current and previous exercise and walking behavior were assessed using a self-reported questionnaire regarding type, frequency, intensity, and duration. Paired Student's t tests were used to compare physical fitness to reference data. The relation of potential determinants with physical fitness was assessed using linear regression analysis.

RESULTS

Exercise behavior was superior in the year before diagnosis compared to the time of study enrollment. Patients reduced frequency, intensity, and duration of sports/exercise after their lung cancer diagnosis. We observed significantly lower endurance capacity (p < .01) and strength performance in lower extremities (p < .01) in male and female patients compared to age and sex-matched reference data. We found significant correlations of previous exercise and walking behavior with physical fitness shortly after diagnosis in patients with advanced lung cancer.

CONCLUSION

Patients with advanced lung cancer showed impaired physical fitness regarding endurance and strength capacity. The strong decline in participation of sports/exercise shortly after diagnosis supports early implementation of physical exercise during anti-cancer treatment.

TRIAL REGISTRATION

ClinicalTrials.gov NCT02055508.

Benefits of home-based multidisciplinary exercise and supportive care in inoperable non-small cell lung cancer - protocol for a phase II randomised controlled trial

Background

Lung cancer is one of the most commonly diagnosed cancers, and is a leading cause of cancer mortality world-wide. Due to lack of early specific symptoms, the majority of patients present with advanced, inoperable disease and five-year relative survival across all stages of non-small cell lung cancer (NSCLC) is 14%. People with lung cancer also report higher levels of symptom distress than those with other forms of cancer. Several benefits for survival and patient reported outcomes are reported from physical activity and exercise in other tumour groups. We report the protocol for a study investigating the benefits of exercise, behaviour change and symptom self-management for patients with recently diagnosed, inoperable, NSCLC.

Methods

This multi-site, parallel-group, assessor-blinded randomised controlled trial, powered for superiority, aims to assess functional and patient-reported outcomes of a multi-disciplinary, home-based exercise and supportive care program for people commencing treatment. Ninety-two participants are being recruited from three tertiary-care hospitals in Melbourne, Australia. Following baseline testing, participants are randomised using concealed allocation, to receive either: a) 8 weeks of home-based exercise (comprising an individualised endurance and resistance exercise program and behaviour change coaching) and nurse-delivered symptom self-management intervention or b) usual care. The primary outcome is the between-group difference in the change in functional exercise capacity (six-minute walk distance) from baseline to post-program assessment. Secondary outcomes include: objective and self-reported physical activity levels, physical activity self-efficacy, behavioural regulation of motivation to exercise and resilience, muscle strength (quadriceps and grip), health-related quality of life, anxiety and depression and symptom interference.

Discussion

There is a lack of evidence regarding the benefit of exercise intervention for people with NSCLC, particularly in those with inoperable disease receiving treatment. This trial will contribute to evidence currently being generated in national and international trials by implementing and evaluating a home-based program including three components not yet combined in previous research, for people with inoperable NSCLC receiving active treatment and involving longer-term follow-up of outcomes. This trial is ongoing and currently recruiting.

Trial registration

This trial was prospectively registered on the Australian New Zealand Clinical Trials Registry (ACTRN12614001268639: (4/12/14).

Electronic supplementary material

The online version of this article (10.1186/s12885-017-3651-4) contains supplementary material, which is available to authorized users.

[Impact of perioperative nutritional therapy on risk and complication management in patients undergoing esophagectomy for cancer]

Esophagectomy is considered to be a high risk procedure regarding postoperative morbidity and mortality. Therefore, in Germany, these operations are limited to hospitals fulfilling a minimum quantity. This systematic review focuses on risk and complication management regarding the impact of perioperative nutritional therapy, including the recent S3-guideline recommendations and comments of the German Working Group of Medical Societies (AWMF) which were established with contributions from the authors.

Symptom burden in lung cancer: management updates

Lung cancer is recognized to carry a high symptom burden with associated lowered quality of life as compared with other cancers. Research has shown that symptom severity can be a prognostic indicator of poorer clinical outcomes and survival post treatment. The purpose of this paper is to review current literature relative to symptom burden associated with diagnosis, medical and/or surgical intervention, assessment and management updates, and emerging initiatives that promote positive outcomes based on updated evidence. Discussion relative to interdisciplinary coordination of supportive services and palliative care initiation is provided.

The challenge of preserving cardiorespiratory fitness in physically inactive patients with colon or breast cancer during adjuvant chemotherapy: a randomised feasibility study

Introduction

Anti-neoplastic treatment is synonymous with an inactive daily life for a substantial number of patients. It remains unclear what is the optimal setting, dosage and combination of exercise and health promoting components that best facilitate patient adherence and symptom management in order to support cardio-respiratory fitness and lifestyle changes in an at-risk population of pre-illness physically inactive cancer patients.

Methods

Patients with breast or colon cancer referred to adjuvant chemotherapy and by the oncologists pre-screening verified as physically inactive were eligible to enter a randomised three-armed feasibility study comparing a 12-week supervised hospital-based moderate to high intensity exercise intervention or alternate an instructive home-based12-week pedometer intervention, with usual care.

Results

Using a recommendation based physical activity screening instrument in order to correspond with cardio-respiratory fitness (VO2 peak) proved to be an applicable method to identify pre-illness physically inactive breast and colon cancer patients. The study demonstrated convincing recruitment (67%), safety and intervention adherence among breast cancer patients; while the attendance rate for colon cancer patients was notably lower (33%). VO2-peak declined on average 12% across study groups from baseline to 12 weeks though indices towards sustaining watt performance and reduce fat mass favoured the hospital-based intervention. Pedometer use was well adapted in both breast and colon cancer patients.

Conclusions

Despite a fair adherence and safety, the current study calls into question whether aerobic exercise, regardless of intensity, is able to increase VO2-peak during texane-based chemotherapy in combination with Neulasta in physically inactive breast cancer patients.

Trial Registration:

ISRCTN24901641

Maintaining physical activity during head and neck cancer treatment: Results of a pilot controlled trial

BACKGROUND

Concurrent chemoradiotherapy (concurrent CRT) to treat head and neck cancer is associated with significant reductions of weight, mobility, and quality of life (QOL). An intervention focusing on functional exercise may attenuate these losses.

METHODS

We allocated patients to a 14-week functional resistance and walking program designed to maintain physical activity during cancer treatment (MPACT group; n = 11), or to usual care (control group; n = 9). Outcomes were assessed at baseline, and 7 and 14 weeks.

RESULTS

Compared to controls, the MPACT participants had attenuated decline or improvement in several strength, mobility, physical activity, diet, and QOL endpoints. These trends were statistically significant (p < .05) in knee strength, mental health, head and neck QOL, and barriers to exercise.

CONCLUSION

In this pilot study of patients with head and neck cancer undergoing concurrent CRT, MPACT training was feasible and maintained or improved function and QOL, thereby providing the basis for larger future interventions with longer follow-up. © 2015 Wiley Periodicals, Inc. Head Neck 38: E1086-E1096, 2016.

The Impact of a Multidimensional Exercise Intervention on Physical and Functional Capacity, Anxiety, and Depression in Patients With Advanced-Stage Lung Cancer Undergoing Chemotherapy

Introduction. Patients with advanced-stage lung cancer face poor survival and experience co-occurring chronic physical and psychosocial symptoms. Despite several years of research in exercise oncology, few exercise studies have targeted advanced lung cancer patients undergoing chemotherapy. The aim of the present study was to investigate the benefits of a 6-week supervised group exercise intervention and to outline the effect on aerobic capacity, strength, health-related quality of life (HRQoL), anxiety, and depression. Methods. VO2peak was assessed using an incremental exercise test. Muscle strength was measured with one repetition maximum test (1RM). HRQoL, anxiety, and depression were assessed using Functional Assessment of Cancer Therapy–Lung (FACT-L) scale and the Hospital Anxiety and Depression Scale (HADS). Results. One hundred and forthteen patients with advanced stage lung cancer were recruited. Forty-three patients dropped out. No serious adverse events were reported. Exercise adherence in the group training was 68%. Improvements in VO2peak ( P < .001) and 6-minute walk distance ( P < .001) and muscle strength measurements ( P < .05) were seen. There was a reduction in anxiety level ( P = .0007) and improvement in the emotional well-being parameter (FACT-L) but no statistically significant changes in HRQoL were observed. Conclusion. The results of the present study show that during a 6-week hospital-based supervised, structured, and group-based exercise program, patients with advanced-stage lung cancer (NSCLC IIIb-IV, ED-SCLC) improve their physical capacity (VO2peak, 1RM), functional capacity, anxiety level, and emotional well-being, but not their overall HRQoL. A randomized controlled trial testing the intervention including 216 patients is currently being carried out.

Voluntary exercise prevents cisplatin-induced muscle wasting during chemotherapy in mice

Loss of muscle mass related to anti-cancer therapy is a major concern in cancer patients, being associated with important clinical endpoints including survival, treatment toxicity and patient-related outcomes. We investigated effects of voluntary exercise during cisplatin treatment on body weight, food intake as well as muscle mass, strength and signalling. Mice were treated weekly with 4 mg/kg cisplatin or saline for 6 weeks, and randomized to voluntary wheel running or not. Cisplatin treatment induced loss of body weight (29.8%, P < 0.001), lean body mass (20.6%, P = 0.001), as well as anorexia, impaired muscle strength (22.5% decrease, P < 0.001) and decreased glucose tolerance. In addition, cisplatin impaired Akt-signalling, induced genes related to protein degradation and inflammation, and reduced muscle glycogen content. Voluntary wheel running during treatment attenuated body weight loss by 50% (P < 0.001), maintained lean body mass (P < 0.001) and muscle strength (P < 0.001), reversed anorexia and impairments in Akt and protein degradation signalling. Cisplatin-induced muscular inflammation was not prevented by voluntary wheel running, nor was glucose tolerance improved. Exercise training may preserve muscle mass in cancer patients receiving cisplatin treatment, potentially improving physical capacity, quality of life and overall survival.