Comparative effect of Tai Chi and aerobic exercise on cognitive function in advanced lung cancer survivors with perceived cognitive impairment: a three-arm randomized controlled trial with mediation analysis

PURPOSE

Cancer-related cognitive impairment is prevalent in metastatic lung cancer survivors. This study aimed to compare the effectiveness of aerobic exercise and Tai Chi on perceived cognitive function and the mediating role of psychoneurological symptoms with perceived cognitive impairment.

METHODS

In a subgroup of a parent randomized clinical trial, participants who reported cognitive impairment underwent a 16-week aerobic exercise (n = 49), Tai Chi (n = 48), and control (n = 54) groups. Measures included perceived cognitive function and psychoneurological symptoms (sleep disturbance, fatigue, anxiety, and depression) assessed at baseline (T0), 16-week (T1), and 1 year (T2).

RESULTS

Participants in Tai Chi showed significant improvements compared to aerobic exercise and control groups in perceived cognitive function at T1 (AE: between-group difference, 6.52; P < 0.001; CG: 8.34; P < 0.001) and T2 (AE: between-group difference, 3.55; P = 0.05; CG: 5.94; P < 0.001). Sleep disturbance, fatigue, anxiety, and depression at month 12 explained 24%, 31%, 32%, and 24% of the effect of the intervention on cognitive function at month 12, respectively. Only anxiety at month 4 explained 23% of the intervention effect at month 12.

CONCLUSIONS

Tai Chi demonstrated beneficial effects on cognitive function in advanced lung cancer survivors with perceived cognitive impairment. Improvement in cognitive function was mediated by reducing sleep disturbance, fatigue, anxiety, and depression, highlighting the importance of addressing these symptoms in future interventions to improve cognitive function, with anxiety playing a significant role at an earlier stage.

IMPLICATIONS FOR CANCER SURVIVORS

Tai Chi is a potentially safe complementary therapeutic option for managing cognitive impairment in this vulnerable population.

TRIAL REGISTRATION

ClinicalTrials.gov identifier: NCT04119778; retrospectively registered on 8 October 2019.

Effectiveness of Aerobic Exercise and Tai Chi Interventions on Sleep Quality in Patients With Advanced Lung Cancer: A Randomized Clinical Trial

Importance

Sleep disturbances prevalent among patients with advanced lung cancer can aggravate physical and psychological symptoms, contributing to decreased quality of life and survival.

Objective

To compare the effectiveness of 2 physical activities of different modalities and intensities, namely aerobic exercise (AE) and tai chi (TC), on subjective sleep quality, physical and psychological outcomes, and survival in patients with advanced lung cancer.

Design, Setting, and Participants

This assessor-blinded, randomized clinical trial was conducted in 3 public hospitals in Hong Kong between December 19, 2018, and September 7, 2022. A total of 226 patients with advanced lung cancer were recruited and randomized 1:1:1 to AE, TC, or the control group.

Interventions

For 16 weeks, the AE group received two 60-minute supervised group exercise sessions and home-based exercises per month, and the TC group received 60-minute group sessions twice weekly. The control group received physical activity guidelines.

Main Outcomes and Measures

The primary outcome was subjective sleep quality. Secondary outcomes included objective sleep measures, anxiety, depression, fatigue, quality of life, physical function, circadian rhythm, and 1-year survival. Assessments were conducted at baseline, 16 weeks (T1), and 1 year (T2).

Results

The 226 participants had a mean (SD) age of 61.41 (8.73) years, and 122 (54.0%) were female. Compared with the control group, participants in the AE and TC groups showed statistically significant improvements in subjective sleep quality from baseline to T1 (AE: between-group difference, -2.72; 95% CI, -3.97 to -1.46; P < .001; TC: between-group difference, -4.21; 95% CI, -5.48 to -2.94; P < .001) and T2 (AE: between-group difference, -1.75; 95% CI, -3.24 to -0.26; P = .02; TC: between-group difference, -3.95; 95% CI, -5.41 to -2.49; P < .001), psychological distress, physical function, step count, and circadian rhythm. The TC group had a statistically significant greater improvement in sleep than the AE group at T1 (between-group difference, -1.49; 95% CI, -2.77 to -0.22; P = .02) and T2 (between-group difference, -2.20; 95% CI, -3.57 to -0.83; P < .001). Participants in the TC group showed statistically significant improvement in survival compared with the control group.

Conclusions and Relevance

In this randomized clinical trial, AE and TC improved sleep, psychological distress, physical function, and circadian rhythm, with TC demonstrating greater benefits on sleep and survival. Both exercises, but particularly TC, can be incorporated into lung cancer survivorship care.

Trial Registration

ClinicalTrials.gov Identifier: NCT04119778.

Glioblastoma and Radiotherapy: a multi-center AI study for Survival Predictions from MRI (GRASP study)

BACKGROUND

The aim was to predict survival of glioblastoma at eight months after radiotherapy (a period allowing for completing a typical course of adjuvant temozolomide), by applying deep learning to the first brain MRI after radiotherapy completion.

METHODS

Retrospective and prospective data were collected from 206 consecutive glioblastoma, IDH-wildtype patients diagnosed between March 2014-February 2022 across 11 UK centers. Models were trained on 158 retrospective patients from three centers. Holdout test sets were retrospective (n=19; internal validation), and prospective (n=29; external validation from eight distinct centers).Neural network branches for T2-weighted and contrast-enhanced T1-weighted inputs were concatenated to predict survival. A non-imaging branch (demographics/MGMT/treatment data) was also combined with the imaging model. We investigated the influence of individual MR sequences; non-imaging features; and weighted dense blocks pretrained for abnormality detection.

RESULTS

The imaging model outperformed the non-imaging model in all test sets (area under the receiver-operating characteristic curve, AUC p=0.038) and performed similarly to a combined imaging/non-imaging model (p>0.05). Imaging, non-imaging, and combined models applied to amalgamated test sets gave AUCs of 0.93, 0.79, and 0.91. Initializing the imaging model with pretrained weights from 10,000s of brain MRIs improved performance considerably (amalgamated test sets without pretraining 0.64; p=0.003).

CONCLUSIONS

A deep learning model using MRI images after radiotherapy, reliably and accurately determined survival of glioblastoma. The model serves as a prognostic biomarker identifying patients who will not survive beyond a typical course of adjuvant temozolomide, thereby stratifying patients into those who might require early second-line or clinical trial treatment.

Targeted gene expression profiling predicts meningioma outcomes and radiotherapy responses

Surgery is the mainstay of treatment for meningioma, the most common primary intracranial tumor, but improvements in meningioma risk stratification are needed and indications for postoperative radiotherapy are controversial. Here we develop a targeted gene expression biomarker that predicts meningioma outcomes and radiotherapy responses. Using a discovery cohort of 173 meningiomas, we developed a 34-gene expression risk score and performed clinical and analytical validation of this biomarker on independent meningiomas from 12 institutions across 3 continents (N = 1,856), including 103 meningiomas from a prospective clinical trial. The gene expression biomarker improved discrimination of outcomes compared with all other systems tested (N = 9) in the clinical validation cohort for local recurrence (5-year area under the curve (AUC) 0.81) and overall survival (5-year AUC 0.80). The increase in AUC compared with the standard of care, World Health Organization 2021 grade, was 0.11 for local recurrence (95% confidence interval 0.07 to 0.17, P < 0.001). The gene expression biomarker identified meningiomas benefiting from postoperative radiotherapy (hazard ratio 0.54, 95% confidence interval 0.37 to 0.78, P = 0.0001) and suggested postoperative management could be refined for 29.8% of patients. In sum, our results identify a targeted gene expression biomarker that improves discrimination of meningioma outcomes, including prediction of postoperative radiotherapy responses.

Impact of weight loss on treatment interruption and unplanned hospital admission in head and neck cancer patients undergoing curative (chemo)-radiotherapy in Hong Kong

PURPOSE

Malnutrition is highly prevalent in head and neck cancer (HNC) patients, with weight loss being one of the major nutritional indicators. The objective of this study was to investigate the impact of weight loss on treatment interruptions and unplanned hospital admissions in HNC patients undergoing radiotherapy (RT) with or without chemotherapy.

METHODS

In this retrospective cohort study, consecutive HNC patients who started RT between January 2011 and December 2019 were included. Data from a total of 1086 subjects with 747 (68.8%) nasopharyngeal carcinomas (NPCs) and 31.2% (N=339) non-NPC patients were analysed. Body weight (BW) was measured before, during, and after RT treatment. Factors associated with ≥10% weight loss, treatment interruption, and unplanned admissions were analysed using multivariate logistic regression.

RESULTS

The prevalence of ≥10% weight loss was 26.8% (N=288), with 32.7% (N=243) in NPC and 13.5% (N=45) in non-NPC patients. The prevalence of RT delay in patients with ≥10% vs. <10% weight loss was 6.2% vs. 7.0% (p=0.668) in NPC patients and 42.2% vs. 50.5% (p=0.300) in non-NPC patients. The prevalence of unplanned admissions in patients with ≥10% vs. <10% weight loss was 51.9% vs. 25.3% (p<0.001) in NPC patients and 68.9% vs. 27.0% (p<0.001) in non-NPC patients.

CONCLUSION

In our study, ≥10% weight loss was found to be associated with a higher rate of unplanned admissions but not with RT delay or chemotherapy interruption.

CLINICAL IMPLICATIONS

With the knowledge of the impact of weight loss on hospital admissions and the characteristics of patients with weight loss, nutritional intervention can be effectively focused on the stratification of patients for intensive nutritional support to reduce weight loss.

The impact of the multi-disciplinary molecular tumour board and integrative next generation sequencing on clinical outcomes in advanced solid tumours

Background

The integration of next-generation sequencing (NGS) comprehensive gene profiling (CGP) into clinical practice is playing an increasingly important role in oncology. Therefore, the HKU-HKSH Multi-disciplinary Molecular Tumour Board (MTB) was established to advance precision oncology in Hong Kong. A multicenter retrospective study investigated the feasibility of the HKU-HKSH MTB in determining genome-guided therapy for treatment-refractory solid cancers in Hong Kong.

Methods

Patients who were presented at the HKU-HKSH MTB between August 2018 and June 2022 were included in this study. The primary study endpoints were the proportion of patients who receive MTB-guided therapy based on genomic analysis and overall survival (OS). Secondary endpoints included the proportion of patients with actionable genomic alterations, objective response rate (ORR), and disease control rate (DCR). The Kaplan-Meier method was used in the survival analyses, and hazard ratios were calculated using univariate Cox regression.

Findings

122 patients were reviewed at the HKU-HKSH MTB, and 63% (n = 77) adopted treatment per the MTB recommendations. These patients achieved a significantly longer median OS than those who did not receive MTB-guided therapy (12.7 months vs. 5.2 months, P = 0.0073). Their ORR and DCR were 29% and 65%, respectively.

Interpretation

Our study demonstrated that among patients with heavily pre-treated advanced solid cancers, MTB-guided treatment could positively impact survival outcomes, thus illustrating the applicability of NGS CGPs in real-world clinical practice.

Funding

The study was supported by the Li Shu Pui Medical Foundation. Dr Aya El Helali was supported by the Li Shu Pui Medical Foundation Fellowship grant from the Li Shu Pui Medical Foundation. Funders had no role in study design, data collection, data analysis, interpretation, or writing of the report.

Consensus Statements on Precision Oncology in the China Greater Bay Area

BACKGROUND

Next-generation sequencing comprehensive genomic panels (NGS CGPs) have enabled the delivery of tailor-made therapeutic approaches to improve survival outcomes in patients with cancer. Within the China Greater Bay Area (GBA), territorial differences in clinical practices and health care systems and strengthening collaboration warrant a regional consensus to consolidate the development and integration of precision oncology (PO). Therefore, the Precision Oncology Working Group (POWG) formulated standardized principles for the clinical application of molecular profiling, interpretation of genomic alterations, and alignment of actionable mutations with sequence-directed therapy to deliver clinical services of excellence and evidence-based care to patients with cancer in the China GBA.

METHODS

Thirty experts used a modified Delphi method. The evidence extracted to support the statements was graded according to the GRADE system and reported according to the Revised Standards for Quality Improvement Reporting Excellence guidelines, version 2.0.

RESULTS

The POWG reached consensus in six key statements: harmonization of reporting and quality assurance of NGS; molecular tumor board and clinical decision support systems for PO; education and training; research and real-world data collection, patient engagement, regulations, and financial reimbursement of PO treatment strategies; and clinical recommendations and implementation of PO in clinical practice.

CONCLUSION

POWG consensus statements standardize the clinical application of NGS CGPs, streamline the interpretation of clinically significant genomic alterations, and align actionable mutations with sequence-directed therapies. The POWG consensus statements may harmonize the utility and delivery of PO in China's GBA.

Targeted gene expression profiling predicts meningioma outcomes and radiotherapy responses

Background

Surgery is the mainstay of treatment for meningioma, the most common primary intracranial tumor, but improvements in meningioma risk stratification are needed and current indications for postoperative radiotherapy are controversial. Recent studies have proposed prognostic meningioma classification systems using DNA methylation profiling, copy number variants, DNA sequencing, RNA sequencing, histology, or integrated models based on multiple combined features. Targeted gene expression profiling has generated robust biomarkers integrating multiple molecular features for other cancers, but is understudied for meningiomas.

Methods

Targeted gene expression profiling was performed on 173 meningiomas and an optimized gene expression biomarker (34 genes) and risk score (0 to 1) was developed to predict clinical outcomes. Clinical and analytical validation was performed on independent meningiomas from 12 institutions across 3 continents (N = 1856), including 103 meningiomas from a prospective clinical trial. Gene expression biomarker performance was compared to 9 other classification systems.

Results

The gene expression biomarker improved discrimination of postoperative meningioma outcomes compared to all other classification systems tested in the independent clinical validation cohort for local recurrence (5-year area under the curve [AUC] 0.81) and overall survival (5-year AUC 0.80). The increase in area under the curve compared to the current standard of care, World Health Organization 2021 grade, was 0.11 for local recurrence (95% confidence interval [CI] 0.07-0.17, P < 0.001). The gene expression biomarker identified meningiomas benefiting from postoperative radiotherapy (hazard ratio 0.54, 95% CI 0.37-0.78, P = 0.0001) and re-classified up to 52.0% meningiomas compared to conventional clinical criteria, suggesting postoperative management could be refined for 29.8% of patients.

Conclusions

A targeted gene expression biomarker improves discrimination of meningioma outcomes compared to recent classification systems and predicts postoperative radiotherapy responses.

Patterns of care and survival of Chinese glioblastoma patients in the temozolomide era: a Hong Kong population-level analysis over a 14-year period

Background

The aim of this study is to address the paucity of epidemiological data regarding the characteristics, treatment patterns and survival outcomes of Chinese glioblastoma patients.

Methods

This was a population-level study of Hong Kong adult (>18 years) Chinese patients with newly diagnosed histologically confirmed glioblastoma between 2006 and 2019. The age standardized incidence rate (ASIR), patient-, tumor- treatment-related characteristics, overall survival (OS) as well as its predictors were determined.

Results

One thousand and ten patients with a median follow-up of 10.0 months were reviewed. The ASIR of glioblastoma was 1.0 per 100 000 population with no significant change during the study period. The mean age was 57 + 14 years. The median OS was 10.6 months (IQR: 5.2-18.4). Independent predictors for survival were: Karnofsky performance score >80 (adjusted OR: 0.8; 95% CI: 0.6-0.9), IDH-1 mutant (aOR: 0.7; 95% CI: 0.5-0.9) or MGMT methylated (aOR: 0.7; 95% CI: 0.5-0.8) glioblastomas, gross total resection (aOR: 0.8; 95% CI: 0.5-0.8) and temozolomide chemoradiotherapy (aOR 0.4; 95% CI: 0.3-0.6). Despite the significant increased administration of temozolomide chemoradiotherapy from 39% (127/326) of patients in 2006-2010 to 63% (227/356) in 2015-2019 (P-value < .001), median OS did not improve (2006-2010: 10.3 months vs 2015-2019: 11.8 months) (OR: 1.1; 95% CI: 0.9-1.3).

Conclusions

The incidence of glioblastoma in the Chinese general population is low. We charted the development of neuro-oncological care of glioblastoma patients in Hong Kong during the temozolomide era. Although there was an increased adoption of temozolomide chemoradiotherapy, a corresponding improvement in survival was not observed.

Suicidal/self-harm behaviors among cancer patients: a population-based competing risk analysis

BACKGROUND

Cancer patients had elevated risk of suicidality. However, few researches studied the risk/protective factors of suicidal/self-harm behaviors considering the competing risk of death. The objective of this study is to systematically investigate the risk of suicidal/self-harm behaviors among Hong Kong cancer patients as well as the contributing factors.

METHODS

Patients aged 10 or above who received their first cancer-related hospital admission (2002-2009) were identified and their inpatient medical records were retrieved. They were followed for 365 days for suicidal/self-harm behaviors or death. Cancer-related information and prior 2-year physical and psychiatric comorbidities were also identified. Competing risk models were performed to explore the cumulative incidence of suicidal/self-harm behavior within 1 year as well as its contributing factors. The analyses were also stratified by age and gender.

RESULTS

In total, 152 061 cancer patients were included in the analyses. The cumulative incidence of suicidal/self-harm behaviors within 1 year was 717.48/100 000 person-years. Overall, cancer severity, a history of suicidal/self-harm behaviors, diabetes and hypertension were related to the risk of suicidal/self-harm behaviors. There was a U-shaped association between age and suicidal/self-harm behaviors with a turning point at 58. Previous psychiatric comorbidities were not related to the risk of suicidal/self-harm behaviors. The stratified analyses confirmed that the impact of contributing factors varied by age and gender.

CONCLUSIONS

Cancer patients were at risk of suicidal/self-harm behaviors, and the impacts of related factors varied by patients' characteristics. Effective suicide prevention for cancer patients should consider the influence of disease progress and the differences in age and gender.

BIOM-40. TARGETED GENE EXPRESSION PROFILING PREDICTS MENINGIOMA OUTCOMES AND RADIOTHERAPY RESPONSES

BACKGROUND

Surgery is the mainstay of meningioma treatment, but improvements in meningioma risk stratification are needed and indications for postoperative radiotherapy are controversial. DNA methylation profiling, copy number variants (CNVs), exome sequencing, and RNA sequencing have improved understanding of meningioma biology, but have not superseded histologic grading, or revealed biomarkers for radiotherapy responses. To address these unmet needs, we optimized and validated a targeted gene expression biomarker predicting meningioma outcomes and responses to radiotherapy.

METHODS

Targeted gene expression profiling was performed on a discovery cohort of 173 meningiomas (median follow-up 8.1 years) and a validation cohort of 331 meningiomas (median follow-up 6.1 years) treated with surgery (n=504) and postoperative radiotherapy (n=73) at independent, international institutions (70% WHO grade 1, 24% WHO grade 2, 6% WHO grade 3). Optimized targeted gene expression models predicting clinical outcomes (34 genes) or radiotherapy responses (12 genes) were developed from the discovery cohort, and compared to histologic and molecular classification systems by performing DNA methylation profiling, CNV analysis, exome sequencing, and RNA sequencing on the same meningiomas.

RESULTS

Targeted gene expression profiling achieved a concordance-index of 0.75 ± 0.03 (SEM) for local freedom from recurrence (LFFR) and 0.72 ± 0.03 for overall survival (OS) in the validation cohort, outperforming WHO grade (5-year LFFR delta-AUC 0.15, 95% CI 0.076-0.229, p=0.001) and DNA methylation grouping (delta-AUC 0.075, 95% CI 0.006-0.130, p=0.01) for LFFR, disease-specific survival, and OS. The biomarker was independently prognostic after accounting for WHO grade, extent of resection, primary versus recurrent presentation, CNV status, DNA methylation group, and Ki67 labeling index, and identified meningiomas benefiting from radiotherapy (interaction p-value=0.0008), suggesting postoperative radiotherapy could be refined in 30.2% of cases.

CONCLUSIONS

Targeted gene expression profiling of 504 meningiomas improves discrimination of meningioma local recurrence, disease-specific survival, and overall survival, and predicts radiotherapy responses.

Using suicide notes to understand suicide among cancer patients: A mixed-method study

BACKGROUND

Cancer patients are at risk of suicide. However, no studies have used suicide notes to investigate their expressed reasons for suicide. The objectives of this study were to compare the characteristics between note leavers and non-leavers among cancer suicide cases and to understand the patterns in expressed reasons for suicide using suicide notes.

METHOD

Suicide cases (2012-2017) were identified from the Hong Kong Coroner's Court reports, which provide detailed information as well as the content of suicide notes. Bivariate tests and multiple logistic regression were performed to compare the characteristics of note leavers and non-leavers among suicide cases with cancer. Thematic analysis was performed on suicide notes to extract themes of expressed reasons for suicides by cancer status and age group.

RESULTS

Among cancer suicide cases and compared to non-leavers, note leavers were younger, more likely to be male, use non-violent suicide methods, have better housing conditions, and live alone. Suffering from physical disease was a major theme identified among cancer note leavers across all age groups. Young and middle-aged non-cancer note leavers had various themes identified. Physical illness was the major theme for elderly non-cancer note leavers.

CONCLUSIONS

Cancer note leavers had unique characteristics and suffering from physical illness was the major expressed reason identified in the suicide notes. Healthcare professionals should pay attention to the mental as well as the physical needs of patients. Improving quality of life and regaining control of life are vital for suicide prevention among cancer patients.

Relationship of subjective and objective sleep measures with physical performance in advanced-stage lung cancer patients

Advanced lung cancer patients suffer from deteriorated physical function, which negatively impacts physical and psychological health. As little is known about sleep and physical function in this population, this study aimed to examine the association between subjective and objective sleep parameters and physical function among them. 164 advanced lung cancer patients were included. Objective sleep was measured by actigraphy (measured on non-dominant wrist for 72 h), and subjective sleep quality was assessed by the Pittsburgh Sleep Quality Index (PSQI). Performance-based physical function was measured by Timed Up and Go Test (TUGT), 6-Minute Walk Test (6MWT), Sit-to-Stand Test, and One-leg Standing Test. Univariable and multivariable regression analyses were employed to examine the association between sleep and physical function. Total sleep time (TST) was significantly associated with the 6MWT (β = 0.259; 95% CI 0.120, 0.398; P < 0.001), TUGT (β = - 0.012; 95% CI = - 0.017, - 0.008; P < 0.001) and Sit-to-Stand Test (β = 0.027; 95% CI = 0.018, 0.035; P < 0.001) after adjustment for multiple covariates. PSQI global score was only significantly associated with TUGT (β = 0.140; 95% CI = 0.000, 0.280; P = 0.050) after adjustment for multiple covariates. Shorter sleep duration significantly predicted poorer physical performance in advanced lung cancer patients, and more attention is required for those with less than 4.3 h of sleep on average.Trial registration: ClinicalTrials.gov, NCT03482323. Registered 29 March 2018, https://clinicaltrials.gov/ct2/show/NCT03482323 ; ClinicalTrials.gov, NCT04119778. Registered 8 October 2019, https://clinicaltrials.gov/ct2/show/NCT04119778 .

Combination atezolizumab, bevacizumab, pemetrexed and carboplatin for metastatic EGFR mutated NSCLC after TKI failure

INTRODUCTION

Acquired resistance to TKI is an important unmet need in the management of EGFR mutated lung cancer. Recent clinical trial IMPower150 suggested that combination approach with VEGF inhibitor, check point inhibitor immunotherapy and platinum-based chemotherapy was effective in oncogene driven lung cancer. The current trial examined the efficacy of a modified regimen in an EGFR mutated cohort.

METHODS

An open-labelled, single arm, phase II study was conducted in patients with EGFR mutated NSCLC who had progressed on at least one EGFR TKI. For those with T790M mutation, radiological progression on osimertinib was required for enrolment. Patients were treated with combination atezolizumab (1200 mg), bevacizumab (7.5 mg/kg), pemetrexed (500 mg/m2) and carboplatin (AUC 5) given once every 3 weeks until progression.

RESULTS

Forty patients were enrolled. Median age was 62 (range 45-76) years. More than one half (23/40, 57.5%) had progressed on osimertinib. PD-L1 expression was < 1% in 52.5%. Median follow-up time was 17.8 months. ORR was 62.5%. Median PFS was 9.4 months (95% CI: 7.6 - 12.1). One year OS was 72.5% (95% CI: 0.56-0.83). Treatment related grade 3 or above adverse events (AE) occurred in 37.5% (15/40). Immune-related AE occurred in 32.5% (13/40) patients. Quality of life measures of function and symptoms did not change significantly throughout the course of treatments. Post-trial rechallenge with EGFR TKI containing regimen resulted in PFS of 5.8 months (95% CI 3.9-10.0 months).

CONCLUSION

Combination approach of atezolizumab, bevacizumab, pemetrexed and carboplatin achieved promising efficacy in metastatic EGFR mutated NSCLC after TKI failure. The results were comparable with taxane based regimen of IMPower150 while toxicity profile was improved.

Comprehensive Genomic Profiling-Guided Niraparib Treatment of Triple-Negative Breast Cancer in a Patient With Extensive Brain Metastasis: Case Report and Literature Review

Homologous recombination deficiency (HRD) is a common phenotypic alteration that is highly druggable with poly (ADP-ribose) polymerase inhibitors (PARPi). Although BRCA1/2 gene mutations are among the commonest genomic aberrations associated with HRD, defects in other DNA damage repair (DDR) genes also may influence clinical response to PARPi. Here, we report the case of a 51-year-old Chinese woman with extensive symptomatic brain metastases from metastatic BRCA1/2 wild-type triple-negative breast cancer (TNBC). Comprehensive genomic profiling (CGP) of resected central nervous system tumor revealed mutations in TP53 and multiple DDR pathway genes, suggesting an HRD phenotype. The patient showed a rapid and remarkable response to single-agent niraparib, and her improved condition remained stable for > 8 weeks. To the best of our knowledge, this is the first report of the use of CGP for guiding targeted therapy with PARPi in patients with TNBC, for which options have been limited. CGP may have an increasingly impactful role to predict clinical response of PARPi in patients with BRCA1/2 wild-type TNBC.

Integrative Palliative Care Service Model Improved End-of-Life Care and Overall Survival of Advanced Cancer Patients in Hong Kong: A Review of Ten-Year Territory-Wide Cohort

Background: Integrated palliative care in oncology service has been widely implemented in Hong Kong since 2006. Aim: The study aimed to review its impact on end-of-life outcomes and overall survival (OS) of cancer patients, as well as its utilization of health care resources in the past 10 years. Design: Cancer deaths of all 43 public hospitals of Hong Kong were screened. Setting/Participants: Randomly selected 2800 cancer deaths formed a representative cohort in all seven service clusters of Hospital Authority at four time points (2006, 2009, 2012, and 2015). Individual patient records were thoroughly reviewed. Propensity score-matched (PSM) analysis was employed to compare the survival of patients. Results: Palliative care provision was associated with improved palliative care outcome, including more prescription of strong opioid, fewer cardiopulmonary resuscitations and intensive care unit admissions, and less futile chemotherapy usage in the end-of-life period (all p < 0.001). In the PSM analysis, the median OS in patients with palliative service (5.10 months, 95% confidence interval [CI] 4.52-5.68 months) was significantly better than those without palliative service (1.96 months, 95% CI 1.66-2.27 months). Patients in the palliative care group had more specialist clinic visits (p < 0.001) and longer hospital stay (p < 0.001) in the last six months of life, although the duration of last admission stay at acute general ward was shortened (p < 0.001). Conclusion: Our results suggested palliative care has played a role in the remarkable improvement in end-of-life outcomes and OS. However, current palliative care model relied heavily on hospital resources. Future work is needed to strengthen community care and to build up quality monitoring systems.

CTNI-69. PRECISION NEURO-ONCOLOGY TREATMENT GUIDED BY NEXT GENERATION SEQUENCING (NGS)-BASED COMPREHENSIVE GENOMIC PROFILING: REAL WORLD EXPERIENCE IN HONG KONG

BACKGROUND

The development of next generation sequencing (NGS) based comprehensive genomic profiling (CGP) has enabled identification of druggable somatic mutations in brain tumours. This cohort reviewed the efficacy of CGP-guided precision treatment in a tertiary neuro-oncology centre.

METHODOLOGY

From May 2017 to May 2020, CGP were arranged for 43 patients. All patients had exhausted conventional treatments or received CGP for clinical trial screening. Targeted deep NGS was used to assess the mutational status, single nucleotide variant, small insertions and deletions and copy number variant of 440 cancer-related genes.

RESULTS

The diagnoses of the 43 patients were GBM (n=23), high grade glioma (n=11), brain metastases (n=4), chordoma (n=3), atypical choroid plexus papilloma (n=1) and meningioma (n=1). In most of the patients (42/43, 97.7%), CGP identified at least one druggable targets with a median of 3. Based on the CGP, 27 patients received precision treatment (62.7%). Among these, 14 were GBM and 6 were other high grade glioma. Treatment given included PARP inhibitors, immunotherapy, multi-kinase inhibitor, selective CDK4/6 inhibitor and mTOR inhibitor. Clinical benefit was achieved in 20 patients out of 27 (74%), including 2 complete response (7.4%), 9 partial response (33.3%) and 9 stable disease (33.3%). The median progression free survival (PFS) were 183 days [95% confident intervals (CI): 81–302 days]. For GBM/high grade glioma patients, median PFS was 125 days [95% CI: 52–215] and six-month PFS was 32.7%. Treatment toxicity was mild except two patients developed grade 3 complications and one grade 5 complication (fatal neutropenic fever). For the 16 patients who did not receive precision treatment, one had no druggable target identified, nine were still stable on standard therapies, 6 were too weak when CGP was available.

CONCLUSION

CGP guided precision treatment for selected, advanced neuro-oncological patients yielded modest clinical efficacy and satisfactory safety profile in real world setting.

EPCO-36. GENOMIC INSTABILITY AND TRANSCRIPTOMIC SIGNATURES UNDERLYING EPIGENETIC MENINGIOMA SUBGROUPS REVEALS MECHANISMS OF IMMUNE INFILTRATION AND THERAPEUTIC VULNERABILITIES

BACKGROUND

Meningioma treatments are limited due to incomplete understanding of meningioma biology. To address this, we performed multiplatform molecular profiling on 565 meningiomas with comprehensive clinical data to define genomic drivers and identify therapeutic vulnerabilities.

METHODS

DNA methylation profiling was performed on meningiomas from UCSF (n=200, discovery) and Hong Kong University (n=365, validation). Median follow-up was 5.6 years, and there were 388/142/35 WHO grade I/II/III meningiomas. Copy number variants (CNVs) were calculated for all meningiomas, and RNA sequencing was performed on UCSF meningiomas. Cell type deconvolution, metagenomics, CRISPR, and pharmacology were used for mechanistic and functional validation.

RESULTS

Unsupervised hierarchical clustering of differentially methylated DNA probes revealed that meningiomas were comprised of 3 epigenetic subgroups associated with good, intermediate, and poor outcomes, with representation from all WHO grades in each subgroup. Meningiomas from the subgroup with the best outcomes (52% WHO grade I) were distinguished by recurrent gain of Chr5. Meningiomas from the subgroup with intermediate outcomes (31% WHO grade II) were distinguished by genomic stability, enrichment of innate immune genes, and immune infiltration in the setting of endogenous retroviral gene re-expression, a mechanism of immune recruitment. The most aggressive subgroup of meningiomas (57% WHO grade III) was distinguished by genomic instability, including recurrent loss of Chr22q harboring NF2, and decreased immune infiltration. Consistently, NF2 suppression in primary meningioma cells derived from immunogenic meningiomas decreased expression of innate immune genes critical for immune recruitment, suggesting a novel immunostimulatory function of NF2. The most aggressive subgroup of meningiomas were further distinguished by activation of the mitogenic FOXM1 transcriptional program, and recurrent loss of Chr9p harboring CDKN2A/B, which rendered primary meningioma cells from this subgroup susceptible to CDK4/6 inhibitors.

CONCLUSIONS

Meningiomas are comprised of 3 epigenetic subgroups defined by genetic mechanisms driving immune infiltration in the tumor microenvironment and meningioma cell proliferation.

Effectiveness of aerobic exercise and mind-body exercise in cancer patients with poor sleep quality: A systematic review and meta-analysis of randomized controlled trials

Exercise has promising effects on sleep disturbances and quality of life among cancer patients. Aerobic exercises (AE) and mind-body exercises (MBE) have different mechanisms for improving sleep, but whether they are effective remains unclear. This systematic review and meta-analysis is the first to examine the effectiveness of AE and MBE on sleep outcomes, specifically among cancer patients with sleep disturbances. A systematic search of several databases, from inception to January 2018, was conducted. The pooled effect sizes suggested that both AE (standardized mean difference (SMD) = 0.33, 95% confidence intervals (CI): 0.11, 0.54) and MBE (SMD = 0.18, 95% CI: 0.06, 0.30), improved sleep outcomes in cancer patients with poor sleep quality post-intervention. The effects remained significant after 3-6 months for AE, but not MBE. Due to the heterogeneity in AE, future studies should establish the optimal AE prescription. For MBE, future research should study essential components that make the intervention effect sustainable.

Local and systemic treatment for HER2-positive breast cancer with brain metastases: a comprehensive review

The management of human epidermal growth factor receptor (HER2)-positive breast cancer has improved over the past decade. However, despite improvements in systemic control, a substantial proportion of patients with advanced HER2-positive breast cancer suffer from central nervous system metastases and even intracranial progression after aggressive local treatment. There is paucity of data and no consensus on the systemic therapies for patients with intracranial progression. This review discusses both local and systemic treatments for HER2-positive breast cancer with brain metastases with a special focus on the response of central nervous system metastases. A recommended practical treatment algorithm to guide physicians in selecting the most appropriate anti-HER2 therapy for their patients is suggested.

Comparing the efficacy of integrative body-mind-spirit intervention with cognitive behavioral therapy in patient-caregiver parallel groups for lung cancer patients using a randomized controlled trial

Purposes/objectives: This paper reports the comparative efficacies of integrative body-mind-spirit intervention (I-BMS) and cognitive behavioral therapy (CBT) in patient-caregiver parallel groups for Chinese patients with lung cancer.Design: Randomized controlled trial (RCT).Methods: One hundred and fifty-seven patient-caregiver dyads with no marked functional impairment were randomized into one of the two interventions with eight weekly patient-caregiver parallel groups. Assessments were conducted at baseline, within one, eight- and sixteen-weeks post-intervention. Effects of treatment group across time were analyzed by multilevel modeling.Findings: CBT led to greater reduction in emotional vulnerability than I-BMS. I-BMS resulted in greater increase in overall QoL and spiritual self-care, and more reduction in depression than CBT. Patients in both interventions experienced improvement in physical, emotional and spiritual, except social, domains of QoL.Conclusion: I-BMS was more efficacious for diverse domains of QoL, and CBT was more effective for emotional well-being, despite the relatively small between-group effect sizes.Implications for psychosocial providers/policy: (1) With the expanding repertoire of psychosocial interventions for families facing lung cancer, it has become imperative to investigate the comparative efficacies of empirically supported and culturally adapted interventions. (2) Our findings show that I-BMS was more effective for diverse domains of QoL, while CBT was more efficacious with emotional well-being, although both interventions led to significant improvements in physical, emotional and spiritual domains of patient QoL. (3) Patient-caregiver parallel groups have been shown to be effective for enhancing QoL of Chinese lung cancer patients. (4) Care professionals are encouraged to dispense interventions based on the idiosyncratic needs and preferences of the patients to maximize the treatment effects.

Risk of self-harm after the diagnosis of psychiatric disorders in Hong Kong, 2000-10: a nested case-control study

BACKGROUND

Psychiatric disorders are established risk factors for self-harm. However, variation in the risk of self-harm by specific psychiatric disorder and stratified by gender and age is rarely examined in population-representative samples. This study aimed to investigate the risk of self-harm following diagnosis of different psychiatric disorders in an Asian population, through a review of inpatient records retrieved from the Hong Kong Clinical Data Analysis and Reporting System (CDARS).

METHODS

For this nested case-control study, the inpatient data of people admitted for any reason to Hong Kong public hospitals, between Jan 1, 2000, and Dec 31, 2010, were extracted from CDARS. Cases were people aged 10 years or older who had been admitted to inpatient care with a first-listed record of psychiatric disorder during the study period. The seven psychiatric disorders of interest were: depression, alcohol misuse or dependence, personality disorders, bipolar disorders, anxiety disorders, schizophrenia, and substance misuse or dependence. Two control patients were matched per case from a subsample of all individuals with the same gender, age, and admission time (ie, same calendar year and month), who did not have any record of the psychiatric disorders of interest. Any patients with a history of self-harm diagnosis before, or at the same time as, the first diagnosis of psychiatric disorder (cases) or admission (controls), were excluded. For each diagnostic category, a Cox proportional hazard regression model was fitted to estimate the adjusted hazard ratio (HR; plus 95% CIs) of associated self-harm, adjusting for gender, age, control-matched admission time, 20 districts of residence, physical comorbidities established as risk factors for self-harm (diabetes, asthma, migraine, epilepsy, HIV, and cancer), and presence of the six other psychiatric disorders. We repeated this analysis in subgroups stratified by gender (male and female) and by age (adolescent, 10-24 years; young adult, 25-44 years; middle-aged, 45-64 years; and older people, ≥65 years).

FINDINGS

Between 2000 and 2010, we followed up a cohort of 86 353 people with a first-recorded diagnosis of a psychiatric disorder of interest, and 134 857 matched controls. The highest risk of self-harm was observed in patients with substance misuse or dependence (adjusted HR vs matched controls, 9·6 [95% CI 8·4-11·0]), followed by those with personality disorders (3·7 [2·8-4·9]) and alcohol misuse or dependence (3·2 [2·9-3·7]). When stratified by gender and age, the highest risk of self-harm behaviour was found in the substance misuse or dependence group for both genders (for female patients: adjusted HR vs matched controls, 7·7 [6·0-9·8]; and for male patients, 10·5 [8·9-12·4]), and for all age groups (adolescent: 9·6 [7·2-12·7]; young adults: 10·2 [8·4-12·3]; middle-aged: 11·2 [8·0-15·6], and older people: 3·2 [1·7-6·1]).

INTERPRETATION

First-recorded diagnoses of psychiatric disorders were significantly associated with an elevated risk of subsequent self-harm. The associations varied considerably by diagnostic categories across gender and age subgroups. Our findings highlight the need to develop more efficient and targeted preventive measures in psychiatric care management, with specific attention to demographic characteristics linked to increased risk within the same diagnostic category.

FUNDING

None.

Comparing dyadic cognitive behavioral therapy (CBT) with dyadic integrative body-mind-spirit intervention (I-BMS) for Chinese family caregivers of lung cancer patients: a randomized controlled trial

PURPOSE

The study adopted a randomized controlled trial to compare the effect of culturally compatible psychosocial interventions on multiple aspects of quality of life (QoL) for family caregivers of lung cancer patients.

METHODS

157 Chinese informal caregivers of lung cancer patients were recruited together with the family members for whom they were providing care, and randomly assigned to either integrative body-mind-spirit intervention (I-BMS) or cognitive behavioral therapy (CBT). Patient-caregiver dyads attended the same arm of intervention in separate groups for 8 weeks. Assessments of generic QoL, anxiety, depression, perceived stress, insomnia, and caregiving burden were measured before intervention (T₀), within 1-week (T₁), 8-week (T₂), and 16-week (T₃) post-intervention.

RESULTS

Adopting the intention-to-treat analysis, family caregivers in receipt of both I-BMS and CBT exhibited a statistically significant improvement in generic QoL immediately following intervention and at follow-up assessments, with moderate effect size. Improvement of insomnia was found at T₁ for both modes, which deteriorated at follow-up; both modes reduced anxiety and perceived stress at follow-up. No intervention effect was observed in depression and domains of caregiving burden. There was no significant interaction effect between intervention type and time. No main or interaction effect between sample background variables and intervention type was found to predict symptomatic changes at T₁ and T₃.

CONCLUSIONS

Culturally attuned I-BMS and CBT exhibited equivalent effectiveness in improving psychological distress and generic QoL for family caregivers of lung cancer patients. To improve the evaluation of outcomes, future study could benefit from incorporating a usual care control.

Regression of BRAF V600E mutant adult glioblastoma after primary combined BRAF-MEK inhibitor targeted therapy: a report of two cases

BACKGROUND

Up to 15% of young adults with glioblastoma have the activating oncogenic BRAF V600E mutation, an actionable target of the MAPK signal transduction pathway governing tumor cell proliferation. Small molecule inhibitors of BRAF and MEK, a downstream protein immediately following BRAF, have been shown to confer a survival advantage for patients with BRAF V600E mutant advanced melanoma. We describe our experience using this combined target therapy for two patients with BRAFV600E mutant glioblastoma (GBM) as primary treatment due to extenuating clinical circumstances that prohibited the prescription of standard treatment.

CASE PRESENTATION

The two patients were both 22 years old on presentation. After the initial tumor resection, they both developed rapid deterioration in performance status within a few weeks due to leptomeningeal metastases. In view of the critical condition, BRAF and MEK inhibitors were prescribed as first line treatment. The two patients both achieved dramatic clinical response, which was parallel to the impressive radiological regression of the disease. Unfortunately, the duration of disease control was short as drug resistance developed rapidly. The two patients died 7 and 7.5 month after initial diagnosis of GBM.

CONCLUSIONS

Primary treatment with inhibitors of BRAF and MEK can lead to tumor regression for patients with BRAF V600E mutant glioblastoma. We therefore recommend that all young GBM patients should undergo BRAFV600E mutation testing, especially for those with unusual aggressive clinical course.

Disorder in Pixel-Level Edge Directions on T1WI Is Associated with the Degree of Radiation Necrosis in Primary and Metastatic Brain Tumors: Preliminary Findings

BACKGROUND AND PURPOSE

Co-occurrence of local anisotropic gradient orientations (COLLAGE) is a recently developed radiomic (computer extracted) feature that captures entropy (measures the degree of disorder) in pixel-level edge directions and was previously shown to distinguish predominant cerebral radiation necrosis from recurrent tumor on gadolinium-contrast T1WI. In this work, we sought to investigate whether COLLAGE measurements from posttreatment gadolinium-contrast T1WI could distinguish varying extents of cerebral radiation necrosis and recurrent tumor classes in a lesion across primary and metastatic brain tumors.

MATERIALS AND METHODS

On a total of 75 gadolinium-contrast T1WI studies obtained from patients with primary and metastatic brain tumors and nasopharyngeal carcinoma, the extent of cerebral radiation necrosis and recurrent tumor in every brain lesion was histopathologically defined by an expert neuropathologist as the following: 1) "pure" cerebral radiation necrosis; 2) "mixed" pathology with coexistence of cerebral radiation necrosis and recurrent tumors; 3) "predominant" (>80%) cerebral radiation necrosis; 4) predominant (>80%) recurrent tumor; and 5) pure tumor. COLLAGE features were extracted from the expert-annotated ROIs on MR imaging. Statistical comparisons of COLLAGE measurements using first-order statistics were performed across pure, mixed, and predominant pathologies of cerebral radiation necrosis and recurrent tumor using the Wilcoxon rank sum test.

RESULTS

COLLAGE features exhibited decreased skewness for patients with pure (0.15 ± 0.12) and predominant cerebral radiation necrosis (0.25 ± 0.09) and were statistically significantly different (P < .05) from those in patients with predominant recurrent tumors, which had highly skewed (0.42 ± 0.21) COLLAGE values. COLLAGE values for the mixed pathology studies were found to lie between predominant cerebral radiation necrosis and recurrent tumor categories.

CONCLUSIONS

With additional independent multisite validation, COLLAGE measurements might enable noninvasive characterization of the degree of recurrent tumor or cerebral radiation necrosis in gadolinium-contrast T1WI of posttreatment lesions.

Management of Nasopharyngeal Carcinoma: Is Adjuvant Therapy Needed?

Nasopharyngeal carcinoma of the undifferentiated histologic subtype is endemic and prevalent in southeast Asia. The dramatic improvement of treatment outcomes and overall prognosis during the past few decades has been attributed to advances in disease screening and diagnosis, diagnostic imaging, radiotherapy techniques, use of combination systemic therapy, and dedicated clinical and biomarker surveillance. The current practice of treating patients with advanced locoregional disease using cisplatin concurrent with conventional fractionated radiotherapy, followed by adjuvant cisplatin and fluorouracil, was established in 1998 when the landmark Intergroup-0099 Study demonstrated a survival benefit with the addition of systemic therapy.

There is little doubt regarding the need for concurrent chemotherapy, but there has been uncertainty about the magnitude of the benefit attributed to the adjuvant phase. Furthermore, instead of one-size-fits-all recommendations, it will be ideal if we can tailor adjuvant therapy to high-risk patients only to avoid unnecessary toxicities. In addition, recent evidence suggests that induction chemotherapy before concurrent chemoradiation can achieve better outcomes, especially in distant control, even in the modern era of intensity-modulated radiation therapy. This article provides a comprehensive review of key literature on the current management of locoregionally advanced nasopharyngeal carcinoma and highlights future research directions to unravel these controversies.

Study protocol of a randomized controlled trial comparing integrative body-mind-spirit intervention and cognitive behavioral therapy in fostering quality of life of patients with lung cancer and their family caregivers

Compared to cancers at other sites, lung cancer often results in greater psychosocial distress to both the patients and their caregivers, due to the poor prognosis and survival rate, as well as the heavy symptom burden. In recent years, making protocols of proposed or on-going studies publicly available via clinical trial registries and/or peer-reviewed journals has benefited health sciences with timely communication of the latest research trends and improved transparency in reporting. However, such practice is yet to be a common sight in evidence-informed social work. Hence, this paper discusses the value of publishing protocols in social work research and presents the protocol of a randomized controlled trial that compares the effectiveness of integrative body-mind-spirit intervention with cognitive behavioral therapy for enhancing quality of life of patients with lung cancer and their family caregivers. The data collection process was still on-going at the time of manuscript submission.

The impact of palliative care training for oncologists and integrative palliative service in a public-funded hospital cluster-a retrospective cohort study

PURPOSE

Oncological care of advanced cancer patients was provided by multiple departments in Hong Kong. One of these departments, the clinical oncology department (COD), introduced systematic palliative care training for its oncologists since 2002. The COD was recognized as a European Society for Medical Oncology (ESMO) Designated Centre of Integrated Oncology and Palliative Care since 2009. This retrospective cohort study aims to review the impact of integrative training and service on palliative care coverage and outcome.

METHODS

Clinical information, palliative service provision, and end-of-life outcomes of patients who passed away from lung, colorectal, liver, stomach, or breast cancer in the Hong Kong West public hospital network during July 2015 to December 2015 were collected.

RESULTS

A total of 307 patients were analyzed. Around half (49.2%) were attended primarily by COD, and 68.9% received palliative service. There are significantly fewer patients referred to palliative care from other departments (p < 0.001), with only 19.9% of this patient group receiving palliative referral. COD patients had longer palliative coverage before death (median 65 days versus 24 days, p < 0.001), higher chance of receiving end-of-life care at hospice units (36.4 versus 21.2%, p = 0.003), lower ICU admission (0.66 versus 5.1%, p = 0.02), and higher percentage of receiving strong opioid in the last 30 days of life (51.0 versus 28.9%, p < 0.001) compared to other departments. In multivariable analysis, COD being the primary care team (odds ratio 12.2, p < 0.001) was associated with higher palliative care coverage.

CONCLUSION

The study results suggested that systematic palliative care training of oncologists and integrative palliative service model was associated with higher palliative service coverage and improved palliative care outcomes.

An update on radiation therapy for brain metastases

Radiation therapy (RT) is an important treatment modality for brain metastases. Recent clinical trials have established the role of stereotactic radiosurgery (SRS) in the improvement of local control of brain metastases. Prospective trial data confirmed the feasibility and efficacy of using SRS alone to treat 5 or more brain metastatic tumors. Besides tumor control, there is increased emphasis on quality of life and neurocognitive function preservation. The new approach of hippocampi-sparing whole brain RT has been tested in an attempt to minimize the neurocognitive toxicity of whole brain RT. There is now level 1 evidence to support the multidisciplinary approach of surgical resection of brain metastases followed by cavity SRS which has been shown to preserve neurocognitive function without compromising survival. The current review summarizes the recent advances in RT for brain metastases.

Seeking and Accepting: U.S. Clergy Theological and Moral Perspectives Informing Decision Making at the End of Life

BACKGROUND

People with serious illness frequently rely on religion/spirituality to cope with their diagnosis, with potentially positive and negative consequences. Clergy are uniquely positioned to help patients consider medical decisions at or near the end of life within a religious/spiritual framework.

OBJECTIVE

We aimed to examine clergy knowledge of end-of-life (EOL) care and beliefs about the role of faith in EOL decision making for patients with serious illness.

DESIGN

Key informant interviews, focus groups, and survey.

SETTING/SUBJECTS

A purposive sample of 35 active clergy in five U.S. states as part of the National Clergy End-of-Life Project.

MEASUREMENT

We assessed participant knowledge of and desire for further education about EOL care. We transcribed interviews and focus groups for the purpose of qualitative analysis.

RESULTS

Clergy had poor knowledge of EOL care; 75% desired more EOL training. Qualitative analysis revealed a theological framework for decision making in serious illness that balances seeking life and accepting death. Clergy viewed comfort-focused treatments as consistent with their faith traditions' views of a good death. They employed a moral framework to determine the appropriateness of EOL decisions, which weighs the impact of multiple factors and upholds the importance of God-given free will. They viewed EOL care choices to be the primary prerogative of patients and families. Clergy described ambivalence about and a passive approach to counseling congregants about decision making despite having defined beliefs regarding EOL care.

CONCLUSIONS

Poor knowledge of EOL care may lead clergy to passively enable congregants with serious illness to pursue potentially nonbeneficial treatments that are associated with increased suffering.

Stereotactic radiosurgery for multiple brain metastases

Stereotactic radiosurgery (SRS) alone has become one of the treatment options for patients with 1-4 metastases as the detrimental effects of whole brain radiation therapy on neurocognition and quality of life are becoming well known. Multiple randomized control trials also failed to show overall survival benefit of adding whole brain radiation therapy to SRS. However, the role of SRS in multiple brain metastases, especially those with ≥ 4 tumors, remains controversial. The literature is emerging, and the limited evidence suggests that the local control benefit is independent of the number of metastases, and that patients with more than four brain metastases have similar overall survival compared to those with 2-4 tumors. This review aims at summarizing the current evidence of SRS for multiple brain metastases, divided into limited (2-3) and multiple (≥ 4) lesions. It also reviews the technical aspects and cost-effectiveness of SRS.

Clinical outcomes of 174 nasopharyngeal carcinoma patients with radiation-induced temporal lobe necrosis

PURPOSE

To retrospectively study the clinical outcomes of nasopharyngeal carcinoma patients with radiation-induced temporal lobe necrosis (TLN) treated with steroids, surgery, or observation only.

METHODS AND PATIENTS

We performed a retrospective analysis of 174 consecutive patients diagnosed with TLN between 1990 and 2008. Before 1998, symptomatic patients were treated with oral steroids, while asymptomatic patients were treated conservatively. After 1998, most symptomatic and asymptomatic patients with a large volume of necrosis were treated by intravenously pulsed-steroid therapy with a standardized protocol. We examined factors affecting grade 4 complication-free survival and overall survival. Outcomes of the three treatment groups, those receiving conservative treatment, those receiving oral steroid, and those receiving intravenous pulse steroid, were compared.

RESULTS

The mean follow-up time was 115 months. Rates of grade 4 complication-free survival at 2 years and at 5 years after diagnosis of TLN were 72.2% and 54.1%, respectively. The 2-year and 5-year overall survival rates were 57.5% and 35.4%, respectively. Multivariate analysis revealed that being symptomatic at diagnosis (relative risk [RR], 4.5; p = 0.0001), re-irradiation of the nasopharynx (NP) (RR, 1.56; p = 0.008), salvage brachytherapy to the NP (RR, 1.75; p = 0.012), and a short latency period before the diagnosis of TLN (RR, 0.96, p < 0.0001) were independent prognosticators of poor grade 4 complication-free survival. Patients with all four factors had a 100% risk of developing grade 4 complications within 5 years; whereas if no factor was present, the risk was 12.5%. Intravenous pulse steroid therapy was associated with a higher clinical response rate compared with conventional steroid therapy (p < 0.0001); however, it did not affect complication-free survival in multivariate analysis.

CONCLUSIONS

TLN patients with good prognosticators could be observed without active treatment. Although treatment with intravenously pulsed steroid was associated with better clinical response than conventional steroid delivery, it did not affect the complication-free survival rate of TLN patients.

Epidemiology and outcome of Candida bloodstream infection in an intensive care unit in Hong Kong

OBJECTIVE

To study the epidemiology of Candida bloodstream infection in the Intensive Care Unit.

DESIGN

Retrospective study.

SETTING

A 22-bed, mixed medical and surgical Intensive Care Unit of a 1400-bed university teaching hospital in Hong Kong.

PATIENTS

All adult patients (>18 years) who had at least one blood culture positive for Candida.

RESULTS

During the 9 years of the study period, there were 128 patients with episodes of candidaemia (point prevalence, 9.6 per 1000 Intensive Care Unit admissions), 72 entailed albicans candidaemia and 56 non-albicans candidaemia. Albicans was still the predominant species, but the incidence of tropicalis was increasing. The median lengths of hospital and Intensive Care Unit stays prior to taking of the culture revealing candidaemia were 15 and 6 days, respectively. In all, 61% of patients did not have Candida colonisation within 2 weeks of their candidaemia. The main anti-fungal agents used were fluconazole and amphotericin B, but only 89 (70%) of the patients received appropriate anti-fungal treatment. Intensive Care Unit and hospital mortalities were 70% and 78%, respectively. Patients who did not receive appropriate treatment within 3 days had a worse outcome than those who did.

CONCLUSIONS

Our data showed a high point prevalence of candidaemia in the Intensive Care Unit. Albicans was still the predominant species. Candidaemia occurred early during Intensive Care Unit stay, and a significant proportion of patients did not have prior fungal colonisation. Candidaemia in the Intensive Care Unit was associated with high morbidity and mortality. Many patients did not receive appropriately early anti-fungal therapy, and endured higher mortality than in the remainder.

Radiation-induced peripheral nerve neurofibromata in a patient receiving hypofractionated radiation therapy

Radiation-induced peripheral nerve tumor, in particular a benign entity such as a neurofibroma, is rare, with only a few cases being reported so far. We demonstrate a case of radiation-induced neurofibromata along the left cervical nerve roots in a man with a background of localized targeted hypofractionated radiation therapy as adjuvant treatment for left cervical nodal metastasis complicating nasopharyngeal carcinoma. The toxicity of high-dose radiation in a hypofractionated regime is also stressed.

Regeneration of nerve fibres across a colonic anastomosis in the guinea-pig

Resection and re-anastomosis of the bowel interrupts enteric neuronal pathways. The reestablishment of neuronal connections across a colonic anastomosis was studied using immunohistochemical, retrograde tracing and physiological techniques. In control guinea-pig proximal colon, retrograde labelling with 1,1'-didodecyl-3,3,3,3'-tetramethylindocarbocyanine perchlorate (DiI) revealed that enteric neurons with anally-directed projections are more numerous and have longer axons than orally-projecting neurons. In resected bowel, up to 26 weeks after re-anastomosis, descending neuronal pathways were substantially interrupted. Immunohistochemical labelling of nerve fibres revealed that some enteric nerve fibres did regenerate across narrow regions of the anastomosis, growing preferentially in the oral to anal direction. However, nerve fibres immunoreactive for neurofilament protein triplet were substantially depleted in myenteric ganglia anal to the anastomosis, even after the longest recovery periods, demonstrating that axonal regrowth was limited. This was confirmed in retrograde tracing studies, as no nerve cell bodies oral to an anastomosis were labelled when DiI was placed on myenteric ganglia just anal to the anastomosis. Physiological studies confirmed that regrowth of nerve fibres across the anastomosis occurred and that it was asymmetric, as electrical stimulation led to aboral conduction across the anastomosis more reliably than oral conduction, as measured by circular muscle contraction. After resection and re-anastomosis of the colon, the disruption of neuronal pathways in the enteric nervous system was observed, with limited and preferential re-establishment of aborally-directed long connections.

Variations in rupture site and surface strains at failure in the maturing rabbit medial collateral ligament

The relationship between the pattern of surface strain and the site of failure in maturing rabbit ligaments was studied in vitro. Bone-medial collateral ligament (MCL)-bone complexes of 24 female New Zealand White rabbits at 3, 6, 9 and 12 months of age (n = 6 rabbits, 12 MCLs per group) were tested in tension to failure. A video dimension analysis (VDA) system was used to map the surface strain at failure across the width and along the length of the medial side of each MCL during testing. Results showed that the highest strains were consistently located at the femoral insertion decreasing towards the midsubstance, with the highest strain occurring in the anterior portion of the MCL immediately adjacent to the femoral insertion. Strains of the complex at failure increased with rabbit maturation. The strain distribution however, did not change dramatically, even though the locations of MCL failure changed from exclusively tibial avulsion in the three month old rabbits to predominantly midsubstance failures in the 12 month old rabbits. In the six month old rabbits, there was a particular dissociation with all MCLs failing near the tibial insertion while femoral strains were apparently the highest. These results suggest two possibilities beyond that of some unknown artifacts of optical strain measurement. First, since failure sites rarely correlated with areas of maximum surface strain in this study, it seems possible that higher strains could exist deeper in the tissue, particularly at the bone-ligament interface of the tibial insertion in immature animals and somewhere within the midsubstance of the MCL in the adult. Secondly, it is possible that the ligament material may be heterogeneous.

A cure for xerostomia? Free jejunal patch graft in oral reconstruction

A case of oral carcinoma associated with extensive leukoplakia and severe xerostomia is presented. The advantage of using a free jejunal patch graft to restore large intra-oral mucosal defects and concurrently eradicate xerostomia is demonstrated. Further, it is recommended that a tracheostomy be used routinely in such cases to avoid postoperative aspiration of the graft secretions. Following healing the use of osseointegrated implants can complete oral rehabilitation without compromising the graft.

Does squatting reduce pelvic floor descent during defaecation?

Neurogenic faecal and urinary incontinence result from a stretch-induced injury to the pelvic nerves, from difficult childbirth or from chronic straining at stool. It has been suggested that the condition occurs less frequently in societies where the squatting position is used during defaecation, and that squatting may minimize pelvic floor descent. This is a prospective study which evaluates the position of the pelvic floor during defaecation straining in 52 patients. The position of the perineum was measured at rest and during maximal defaecation straining using a perineometer, with the patient in the left lateral, sitting and squatting positions. There was a significant difference in the position of the perineum at rest and on straining between the left lateral position and both the sitting and squatting positions. However, there was no significant difference at rest or on straining between the sitting and squatting positions. These results show that squatting does not reduce pelvic floor descent during defaecation straining, and imply that squatting would not help reverse stretch-induced pudendal nerve damage.

Changes in the cyclic and static relaxations of the rabbit medial collateral ligament complex during maturation

There is at present no information on how the viscoelastic properties of bone-ligament-bone complexes change during maturation. Changes in the static and the cyclic relaxation behaviours of rabbit bone-medial-collateral-ligament-bone complexes at 3, 6, 9 and 12 months of age are described. These ages cover maturation and initial ageing of this complex. The specimens were subject to 30 cycles of uniaxial tension between zero and 0.68 mm extension at 10 mm min-1. Immediately after the cyclic test, the specimens were held at a constant 0.68 mm extension for 1200 s. The results showed that in both the cyclic and the static tests, specimens from 3-month-old animals relaxed significantly more than specimens at 6, 9 or 12 months of age, whereas those 6, 9 and 12 months old were not significantly different from each other. When the results of the cyclic tests were compared to those of the static tests, cyclic relaxation was higher than static relaxation for each of the 6-, 9- and 12-month-old specimens. For specimens 3 months of age, the opposite was observed. An explanation is offered whereby the total relaxation is suggested to be comprised of two parts: a material relaxation and a water flux component. Differing contributions by each of the two components at particular ages can explain the observed results.

Calibration characteristics of a video dimension analyser (VDA) system

A comprehensive calibration and error analysis of a video dimension analyser (VDA) system was carried out to determine the effects of various parameters relevant to actual test conditions on the characteristics of the system. The parameters considered were: (1) varying distances or angles between the test specimen and the camera; (2) refractive effects of glass tank and physiologic solutions; and (3) dynamic response of the VDA system. The error analysis shows that, at low strain levels, the strain computed by the VDA is sensitive to camera placement and orientation as well as the media through which the object is observed. Very large errors can occur at small nominal strains, depending on the system parameters (e.g. 80% error at 1% nominal strain for one set of parameters). At higher strain levels, the sensitivity of the system is reduced, and the strain computed by the VDA system approaches the nominal strain (10% error at 10% nominal strain).