Advances in the detection of colorectal cancer

Colorectal cancer (CRC) is a significant cause of mortality. In the UK, 1 in 14 men and 1 in 19 women will develop CRC in their lifetime. Overall, five-year survival is 60% and this compares poorly to many countries in Western Europe. Survival is directly linked to stage at presentation. The majority present at Dukes stage B or above. Better methods of detecting CRC at an earlier stage are needed to improve survival figures. Published evidence on the two-week wait pathway (TWW) for detecting CRC was evaluated using a systematic review. This showed low CRC detection and no difference in stage at presentation in the TWW group compared with the non-TWW pathways of referral. These results indicate the emphasis on TWW targets is not justified and should prompt consideration of better methods of risk stratification for those with suspected CRC. Biomarkers have the potential to improve the positive predictive value of referral criteria in the symptomatic population and also increase the sensitivity of the faecal occult blood test when used as an adjunct in the bowel screening population. Two potential urinary biomarker groups in the detection of CRC were explored: one based on volatile organic compounds (VOCs) and one on peptide markers. Analysis demonstrated that CRC could be correctly classified from control using a VOC or peptide biomarker-based test with a high degree of accuracy in pilot work. Further protein analysis using immunohistochemistry explored the role of Meprin alpha in the pathology of CRC with possible implications in aggressive disease. There is a need for better ways of detecting CRC and biomarkers hold huge potential. But there must be a culture change from the current fragmented approach to elucidating diagnostics in CRC. Collaborations between research groups and data-sharing is essential to validate pilot studies and share knowledge on methodology and results

Young adult carers—Transitioning to adulthood or to adult caring?

Social care policy in the UK emphasises the importance of supporting young adult carers to make positive transitions to adulthood. This paper reports findings from a qualitative study which explored whether young adult carers' services in England are facilitating transitions. The research found that young adult carers' services were endeavouring to raise young adult carers' aspirations and achieve personalised outcomes, in line with the Care Act 2014. However, formal provision for young adult carers in England, in the main, designates them as adult carers. Yet, young adult carers need to have sufficient opportunities for making decisions about their futures. Strategic funding and development of services are required to enable the Act's vision to be achieved

Young Adult Carers Services in England: Facilitating Choice over Future Caring?

This paper reports findings from a national, qualitative study in England that investigated if young adult carers services are facilitating young people’s transitions to adulthood, including considering a future beyond caring. Semi-structured, online interviews were conducted in 2022 with a purposive sample of managers or lead workers of eleven young adult carers services in England. We discuss the consideration given in assessments to young people’s caring preferences and the availability of support to facilitate them to relinquish their role, if they so wished. The majority of young adult carers services gave young people the opportunity to express their views on this issue. Although the Care Act 2014 aimed to provide choice over caring in adulthood to young adult carers, this was not matched by the necessary service provision to facilitate their preferences. A new national carers strategy is urgently required to ensure that young people, particularly women, have a credible choice over their future lives

Pre-analytical and analytical variables that influence urinary volatile organic compound measurements

There has been rapidly accelerating interest in the utilization of volatile organic compounds (VOCs) as non-invasive methods for rapid point-of-care medical diagnostics. There is widespread variation in analytical methods and protocols, with little understanding of the effects of sample storage on VOC profiles. This study aimed to determine the effects on VOC profiles of different storage times, at room temperature, prior to freezing, of sealed urine samples from healthy individuals. Analysis using Field Asymmetric Ion Motility Spectrometry (FAIMS) determined the alterations in VOC and total ion count profiles as a result of increasing room temperature storage times. Results indicated that increasing exposure time to room temperature prior to freezing had a threefold effect. Firstly, increased urinary VOC profile variability, with a plateau phase between 12 and 48 hours, before further degradation. Secondly, an increase in total ion count with time exposed to room temperature. Finally, a deterioration in VOCs with each sample run during the analysis process. This provides new insight into the effect of storage of urine samples for VOC analysis using FAIMS technology. Results of this study provide a recommendation for a 12-hour maximum duration at room temperature prior to storage

Variation in gas and volatile compound emissions from human urine as it ages, measured by an electronic nose

The medical profession is becoming ever more interested in the use of gas-phase biomarkers for disease identification and monitoring. This is due in part to its rapid analysis time and low test cost, which makes it attractive for many different clinical arenas. One technology that is showing promise for analyzing these gas-phase biomarkers is the electronic nose-an instrument designed to replicate the biological olfactory system. Of the possible biological media available to "sniff", urine is becoming ever more important as it is easy to collect and to store for batch testing. However, this raises the question of sample storage shelf-life, even at -80 °C. Here we investigated the effect of storage time (years) on stability and reproducibility of total gas/vapour emissions from urine samples. Urine samples from 87 patients with Type 2 Diabetes Mellitus were collected over a four-year period and stored at -80 °C. These samples were then analyzed using FAIMS (field-asymmetric ion mobility spectrometry-a type of electronic nose). It was discovered that gas emissions (concentration and diversity) reduced over time. However, there was less variation in the initial nine months of storage with greater uniformity and stability of concentrations together with tighter clustering of the total number of chemicals released. This suggests that nine months could be considered a general guide to a sample shelf-life

Recovering Variations in Facial Albedo from Low Resolution Images

Search strategies for PubMed MEDLINE. (PDF 806 kb

Volatile organic compounds in breath can serve as a non-invasive diagnostic biomarker for the detection of advanced adenomas and colorectal cancer

Contains fulltext : 220031.pdf (Publisher’s version ) (Open Access)BACKGROUND: Colorectal cancer (CRC) is the third most common cancer diagnosis in the Western world. AIM: To evaluate exhaled volatile organic compounds (VOCs) as a non-invasive biomarker for the detection of CRC and precursor lesions using an electronic nose. METHODS: In this multicentre study adult colonoscopy patients, without inflammatory bowel disease or (previous) malignancy, were invited for breath analysis. Two-thirds of the breath tests were randomly assigned to develop training models which were used to predict the diagnosis of the remaining patients (external validation). In the end, all data were used to develop final-disease models to further improve the discriminatory power of the algorithms. RESULTS: Five hundred and eleven breath samples were collected. Sixty-four patients were excluded due to an inadequate breath test (n = 51), incomplete colonoscopy (n = 8) or colitis (n = 5). Classification was based on the most advanced lesion found; CRC (n = 70), advanced adenomas (AAs) (n = 117), non-advanced adenoma (n = 117), hyperplastic polyp (n = 15), normal colonoscopy (n = 125). Training models for CRC and AAs had an area under the curve (AUC) of 0.76 and 0.71 and blind validation resulted in an AUC of 0.74 and 0.61 respectively. Final models for CRC and AAs yielded an AUC of 0.84 (sensitivity 95% and specificity 64%) and 0.73 (sensitivity and specificity 79% and 59%) respectively. CONCLUSIONS: This study suggests that exhaled VOCs could potentially serve as a non-invasive biomarker for the detection of CRC and AAs. Future studies including more patients could further improve the discriminatory potential of VOC analysis for the detection of (pre-)malignant colorectal lesions. (https://clinicaltrials.gov Identifier NCT03488537)

Time to endoscopy for acute upper gastrointestinal bleeding: results from a prospective multicentre trainee-led audit

Background: Endoscopy within 24 hours of admission (early endoscopy) is a quality standard in acute upper gastrointestinal bleeding (AUGIB). We aimed to audit time to endoscopy outcomes and identify factors affecting delayed endoscopy (>24h of admission).Methods: This prospective multicentre audit enrolled patients admitted with AUGIB who underwent inpatient endoscopy between Nov-Dec 2017. Analyses were performed to identify factorsassociated with delayed endoscopy, and to compare patient outcomes, including length of stay and mortality rates, between early and delayed endoscopy groups.Results: Across 348 patients from 20 centres, the median time to endoscopy was 21.2h (IQR 12.0- 35.7), comprising median admission to referral and referral to endoscopy times of 8.1h (IQR 3.7- 18.1) and 6.7h (IQR 3.0-23.1) respectively. Early endoscopy was achieved in 58.9%, although this varied by centre (range: 31.0% - 87.5%, p=0.002). On multivariable analysis, lower Glasgow-Blatchford score, delayed referral, admissions between 7am-7pm or via the Emergency Department were independent predictors of delayed endoscopy. Early endoscopy was associated with reduced length of stay (median difference 1d; p= 0.004), but not 30-day mortality (p=0.344).Conclusions: The majority of centres did not meet national standards for time to endoscopy. Strategic initiatives involving acute care services may be necessary to improve this outcome