15 research outputs found
Portable microfluidic chip for detection of Escherichia coli in produce and blood
Pathogenic agents can lead to severe clinical outcomes such as food poisoning, infection of open wounds, particularly in burn injuries and sepsis. Rapid detection of these pathogens can monitor these infections in a timely manner improving clinical outcomes. Conventional bacterial detection methods, such as agar plate culture or polymerase chain reaction, are time-consuming and dependent on complex and expensive instruments, which are not suitable for point-of-care (POC) settings. Therefore, there is an unmet need to develop a simple, rapid method for detection of pathogens such as Escherichia coli. Here, we present an immunobased microchip technology that can rapidly detect and quantify bacterial presence in various sources including physiologically relevant buffer solution (phosphate buffered saline [PBS]), blood, milk, and spinach. The microchip showed reliable capture of E. coli in PBS with an efficiency of 71.8% ± 5% at concentrations ranging from 50 to 4,000 CFUs/mL via lipopolysaccharide binding protein. The limits of detection of the microchip for PBS, blood, milk, and spinach samples were 50, 50, 50, and 500 CFUs/mL, respectively. The presented technology can be broadly applied to other pathogens at the POC, enabling various applications including surveillance of food supply and monitoring of bacteriology in patients with burn wounds
Large Language Models to Identify Social Determinants of Health in Electronic Health Records
Social determinants of health (SDoH) have an important impact on patient
outcomes but are incompletely collected from the electronic health records
(EHR). This study researched the ability of large language models to extract
SDoH from free text in EHRs, where they are most commonly documented, and
explored the role of synthetic clinical text for improving the extraction of
these scarcely documented, yet extremely valuable, clinical data. 800 patient
notes were annotated for SDoH categories, and several transformer-based models
were evaluated. The study also experimented with synthetic data generation and
assessed for algorithmic bias. Our best-performing models were fine-tuned
Flan-T5 XL (macro-F1 0.71) for any SDoH, and Flan-T5 XXL (macro-F1 0.70). The
benefit of augmenting fine-tuning with synthetic data varied across model
architecture and size, with smaller Flan-T5 models (base and large) showing the
greatest improvements in performance (delta F1 +0.12 to +0.23). Model
performance was similar on the in-hospital system dataset but worse on the
MIMIC-III dataset. Our best-performing fine-tuned models outperformed zero- and
few-shot performance of ChatGPT-family models for both tasks. These fine-tuned
models were less likely than ChatGPT to change their prediction when
race/ethnicity and gender descriptors were added to the text, suggesting less
algorithmic bias (p<0.05). At the patient-level, our models identified 93.8% of
patients with adverse SDoH, while ICD-10 codes captured 2.0%. Our method can
effectively extracted SDoH information from clinic notes, performing better
compare to GPT zero- and few-shot settings. These models could enhance
real-world evidence on SDoH and aid in identifying patients needing social
support.Comment: 38 pages, 5 figures, 5 tables in main, submitted for revie
Body Composition in Advanced or Metastatic Non-Small Cell Lung Cancer Treated with Immunotherapy
On Technology And Innovations In Cancer Imaging And Image-Guided Therapy
Advances in technology have provided humanity with tools to combat one of its greatest scourges, cancer. In the late 19th century, the discovery of X-radiation paved way for the development of tools that can enable visualization of structures inside the body and to assess tissues non-invasively. This allowed for earlier detection of a wide range of pathologies including neoplastic disease, as well as provide a platform for the development of image-guided cancer therapies. More recently, advances in computer vision and “artificial intelligence” have allowed for detailed analysis of radiographic characteristics of diseased tissue and the identification of clinically significant features not apparent to the human observer, particularly in oncologic imaging.
The goal of this thesis is to contribute to the technical development of novel cancer imaging and radiomics approaches using artificial neural networks, and to highlight imaging based diagnostic and therapeutic technologies that are already impacting cancer care. The current trajectory of imaging and technological adoption in the diagnosis and management of neoplastic disease is readily apparent in this work.
The first aim is achieved with two exploratory studies assessing the utility of artificial intelligence enabled radiomics in decoding tumor phenotypes and for prognostic analysis in lung cancer. We used deep-learning based approaches to predict tumor histology in early stage non‑small cell lung cancer (NSCLC) using non-invasive computed tomography (CT) data. We also find that convolutional neural network (CNN)- derived CT-radiomics features have prognostic value and can be used to stratify early stage NSCLC patients into long-term and short‑term survival groups. Deep-learning approaches have emerged as robust alternatives to traditional statistical pattern recognition algorithms including Bayesian methods and probabilistic graphical models for image analysis, thereby presenting viable alternatives for image interpretation and classification.
The second aim was achieved by reviewing a multi-centered study assessing the impact of MRI-guided laser thermal therapy on outcomes in patients with brain metastases failing stereotactic radiosurgery. We also present a case in which a patient with an atypical presentation of hemolytic anemia found to have a neuroendocrine tumor benefited from somatostatin receptor-based imaging techniques in determining the etiology and extent of his disease.
Improvements due to novel computational approaches for image processing and analysis may help accelerate the technical capacity for image-guided treatments, as well as improve image reconstruction in some of the widely utilized modalities for cancer imaging. Furthermore, deep-learning and data science may help us gain new insights from outcomes in large patient datasets. Similarly, current patient experiences and results from clinical studies may help inform future directions of technical development. Therefore, this thesis serves as an example of how two or more domains of expertise, clinical and technical, can work synergistically to either answer new questions, or old questions using new techniques. All work presented here is based on scientific publications in which the candidate was first author, or on technical and computational approaches developed by the candidate and presented at national and international meetings
A deep-learning radiomics model for predicting survival in early-stage non-small cell lung cancer.
Deep learning classification of lung cancer histology using CT images
Tumor histology is an important predictor of therapeutic response and outcomes in lung cancer. Tissue sampling for pathologist review is the most reliable method for histology classification, however, recent advances in deep learning for medical image analysis allude to the utility of radiologic data in further describing disease characteristics and for risk stratification. In this study, we propose a radiomics approach to predicting non-small cell lung cancer (NSCLC) tumor histology from non-invasive standard-of-care computed tomography (CT) data. We trained and validated convolutional neural networks (CNNs) on a dataset comprising 311 early-stage NSCLC patients receiving surgical treatment at Massachusetts General Hospital (MGH), with a focus on the two most common histological types: adenocarcinoma (ADC) and Squamous Cell Carcinoma (SCC). The CNNs were able to predict tumor histology with an AUC of 0.71(p=0.018). We also found that using machine learning classifiers such as k-nearest neighbors (kNN) and support vector machine (SVM) on CNN-derived quantitative radiomics features yielded comparable discriminative performance, with AUC of up to 0.71 (p=0.017). Our best performing CNN functioned as a robust probabilistic classifier in heterogeneous test sets, with qualitatively interpretable visual explanations to its predictions. Deep learning based radiomics can identify histological phenotypes in lung cancer. It has the potential to augment existing approaches and serve as a corrective aid for diagnosticians
Deep learning classification of lung cancer histology using CT images
Tumor histology is an important predictor of therapeutic response and outcomes in lung cancer. Tissue sampling for pathologist review is the most reliable method for histology classification, however, recent advances in deep learning for medical image analysis allude to the utility of radiologic data in further describing disease characteristics and for risk stratification. In this study, we propose a radiomics approach to predicting non-small cell lung cancer (NSCLC) tumor histology from non-invasive standard-of-care computed tomography (CT) data. We trained and validated convolutional neural networks (CNNs) on a dataset comprising 311 early-stage NSCLC patients receiving surgical treatment at Massachusetts General Hospital (MGH), with a focus on the two most common histological types: adenocarcinoma (ADC) and Squamous Cell Carcinoma (SCC). The CNNs were able to predict tumor histology with an AUC of 0.71(p=0.018). We also found that using machine learning classifiers such as k-nearest neighbors (kNN) and support vector machine (SVM) on CNN-derived quantitative radiomics features yielded comparable discriminative performance, with AUC of up to 0.71 (p=0.017). Our best performing CNN functioned as a robust probabilistic classifier in heterogeneous test sets, with qualitatively interpretable visual explanations to its predictions. Deep learning based radiomics can identify histological phenotypes in lung cancer. It has the potential to augment existing approaches and serve as a corrective aid for diagnosticians
Foundation Models for Quantitative Biomarker Discovery in Cancer Imaging
Foundation models represent a recent paradigm shift in deep learning, where a single large-scale model trained on vast amounts of data can serve as the foundation for various downstream tasks. Foundation models are generally trained using self-supervised learning and excel in reducing the demand for training samples in downstream applications. This is especially important in medicine, where large labeled datasets are often scarce. Here, we developed a foundation model for imaging biomarker discovery by training a convolutional encoder through self-supervised learning using a comprehensive dataset of 11,467 radiographic lesions. The foundation model was evaluated in distinct and clinically relevant applications of imaging-based biomarkers. We found that they facilitated better and more efficient learning of imaging biomarkers and yielded task-specific models that significantly outperformed their conventional supervised counterparts on downstream tasks. The performance gain was most prominent when training dataset sizes were very limited. Furthermore, foundation models were more stable to input and inter-reader variations and showed stronger associations with underlying biology. Our results demonstrate the tremendous potential of foundation models in discovering novel imaging biomarkers that may extend to other clinical use cases and can accelerate the widespread translation of imaging biomarkers into clinical settings
Elevated Coronary Artery Calcium Quantified by a Validated Deep Learning Model From Lung Cancer Radiotherapy Planning Scans Predicts Mortality
PURPOSE: Coronary artery calcium (CAC) quantified on computed tomography (CT) scans is a robust predictor of atherosclerotic coronary disease; however, the feasibility and relevance of quantitating CAC from lung cancer radiotherapy planning CT scans is unknown. We used a previously validated deep learning (DL) model to assess whether CAC is a predictor of all-cause mortality and major adverse cardiac events (MACEs). METHODS: Retrospective analysis of non-contrast-enhanced radiotherapy planning CT scans from 428 patients with locally advanced lung cancer is performed. The DL-CAC algorithm was previously trained on 1,636 cardiac-gated CT scans and tested on four clinical trial cohorts. Plaques ≥ 1 cubic millimeter were measured to generate an Agatston-like DL-CAC score and grouped as DL-CAC = 0 (very low risk) and DL-CAC ≥ 1 (elevated risk). Cox and Fine and Gray regressions were adjusted for lung cancer and cardiovascular factors. RESULTS: The median follow-up was 18.1 months. The majority (61.4%) had a DL-CAC ≥ 1. There was an increased risk of all-cause mortality with DL-CAC ≥ 1 versus DL-CAC = 0 (adjusted hazard ratio, 1.51; 95% CI, 1.01 to 2.26; P = .04), with 2-year estimates of 56.2% versus 45.4%, respectively. There was a trend toward increased risk of major adverse cardiac events with DL-CAC ≥ 1 versus DL-CAC = 0 (hazard ratio, 1.80; 95% CI, 0.87 to 3.74; P = .11), with 2-year estimates of 7.3% versus 1.2%, respectively. CONCLUSION: In this proof-of-concept study, CAC was effectively measured from routinely acquired radiotherapy planning CT scans using an automated model. Elevated CAC, as predicted by the DL model, was associated with an increased risk of mortality, suggesting a potential benefit for automated cardiac risk screening before cancer therapy begins