United States

Background:
Breast cancer is the most commonly diagnosed cancer type, accounting for about 2.3 million new cases and 685,000 deaths worldwide in 2020. In the US, breast cancer screenings are routinely performed in women starting from the age of 40. One major challenge with breast screening is the high rate of false positives, with over 50% of women experiencing at least one false positive result over 10 years of annual screening on plain film mammography, the most common breast cancer screening modality. Deep learning methods have been shown to be effective in reducing false positive rates that are associated with unnecessary costs, medical procedures, and emotional burden on patients, as well as improving the accuracy of cancer detection in screening mammograms — hence, this study investigates the use of deep learning methods for breast cancer detection. Our aim was to investigate and evaluate the performance of transfer learning and deep learning models in breast cancer detection.

Methods:
We trained and evaluated our deep learning model using multi-center breast screening data provided by Kaggle in the RSNA Screening Mammography Breast Cancer Detection competition. Our model uses mammogram images as input to fine-tune a pre-trained ResNet-50 deep-learning model via transfer learning and outputs the probability of cancer in each image. The model performance is evaluated using a held-out test-set (train:validate:test 70:10:20) to compute the sensitivity, specificity, and probabilistic F1-score achieved.

Results:
Overall we achieved a classification sensitivity of 1.00 and a specificity of 1.00 (ROC-AUC=1.00) on our held-out test set, with a probabilistic F1 score of 0.795 on our held-out test set. 

Conclusion:
Our model detected breast cancer with 100% sensitivity and specificity in the held-out test set. Future work may focus on validating algorithm performance in a larger out-of-distribution patient cohort. Application of deep learning models to breast cancer detection in mammograms may lead to improved clinical efficiency, diagnostic accuracy, and reduction in costs associated with the high false positive burden in breast cancer screening.


2023 AMA Research Challenge

Deep Transfer Learning for Breast Cancer Detection Using 2D Screening Mammography

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**Abstract:**



T2 White Matter Hyperintensity Volumes Are Correlated With Poststroke Neuropsychological Deficits

Background
Renal cell carcinoma (RCC) is a highly heterogenous cancer that typically relies on biopsy to identify the specific tumor subtype and identify high-grade histology. However, accuracy and reliability of biopsy is sometimes limited by tumor heterogeneity. The use of 3D printing to improve the accuracy of this process has been previously described for prostate and renal cancers. Preoperative imaging is used to 3D print “negative” molds matching the contour of the surgically removed tumor and provide guiding lines along which to cut precise slices that correspond with imaging slices. Our objective was to design a novel technique combining negative molds with additional 3D-printed overlays, or “positive” molds that would fit onto the pathology slices and have cutouts to denote regions of interest previously identified on imaging, further facilitating the sectioning process and correlating pathology findings to imaging in RCC.

Methods
This was a single-center, IRB-approved, prospective study in patients with RCC who planned to undergo partial or radical nephrectomy. Preoperative images were transferred to a viewing software (3D Slicer), and their data was used to generate “positive” and “negative” 3D -printed molds. Following nephrectomy, kidneys were sectioned by a study pathologist and study radiologist using the 3D-printed molds. Pathology slides were then directly compared to CT by a radiologist using 3D Slicer and Docker to determine degree of pathology-to-radiology correlation. 

Results
11 total 3D-printed molds were constructed. Mold failure was defined by cases where 3D-printed molds could not be used throughout the entire sectioning process, or where lesions on pathology did not align with preoperative imaging. Mold success was defined by cases with complete mold-assisted sectioning and correlation of pathology to radiology images. The first 5 molds produced failed, either due to tumor growth between imaging and sectioning (n=3) or perirenal fat (n=2). Improvements in mold design using a bivalving technique were achieved following discussion between the study urologist, pathologist, and radiologist, and the subsequent 6 molds produced were successful.

Conclusion
In this study, we aimed to develop a novel technique for designing patient-specific renal molds to improve the diagnostic accuracy of tumor grading in renal cell carcinoma (RCC), which we achieved following multidisciplinary discussion and process revision. This is the first study to describe such an approach using negative and positive 3D-printed molds, and further research is warranted to validate the efficacy and efficiency of our proposed methodology in order to better standardize tumor sectioning and advance the diagnostic process for RCC.


3D Printed Molds for Pathology Sectioning of Renal Masses: Enabling Radiology-Pathology Correlation

Background:
Magnetic Resonance Imaging (MRI) has been a large component of the evaluation of breast lesions in high-risk women for the last decade. Many of these imaging tools have been developed to assist physicians in risk stratifying patients. Specifically, Time Activity Curves (TAC) have been utilized to incorporate contrast uptake patterns into decision making. In the years since its inception, new tools have been developed to more efficiently and accurately classify different TACs, such as DynaCAD. Previous studies on the use of TAC curves have indicated their accuracy is not sufficient to be utilized without morphological and historical data being incorporated, but it is unclear how the improvements noted in these tools affects these results. Therefore, we re-evaluate TACs within a broad patient population and treatment landscape.
Methods:
We performed a retrospective chart review of 48 patients who received both an MRI with DynaCAD TAC analysis followed by a diagnostic biopsy. Of the 48 patients evaluated, 18 were malignant and 30 were benign. We performed statistical analysis for sensitivity, specificity, negative predictive value (NPV) and positive predictive value (PPV) on this set of patient results, stratifying by the individual kinetic classification as well as the generally accepted associations of each type with malignancy (Type 1 classically benign, Type 2 and 3, concerning for malignancy). We performed a literature search for previously reported TAC statistics.
Results:
From the 48 patients evaluated, washout curves utilized alone as a marker of malignancy status resulted in a sensitivity of 64.3%, specificity of 73.5% and PPV of 50% and NPV of 83%. When stratified by individual TAC curve type, persistent was calculated to have 50% and 81.1% sensitivity and specificity, respectively. Plateau was calculated to have a 72% and 94% sensitivity and specificity, respectively. Washout was calculated to have a 78.3% and 76.9% sensitivity and specificity, respectively.
Conclusion:
For years, TAC curves have been utilized to enhance radiologists’ ability to classify breast lesions as likely benign or malignant in high-risk patients. In our study we evaluated the accuracy of TACs with the new improvements provided by more advanced commercial tools. We have found TAC curves have improved in their accuracy with the rapid improvement of analysis tools. However, their primary benefit lies in being an ancillary tool for determining benignlesions along with morphological data and they still struggle in accurately predicting malignancy on biopsy. The study is limited due to its lower total patient population.

Revisiting Time Activity Curves in Breast MRI: Has it kept up with the times?

Background: Prostate cancer (PCa) is the second most commonly diagnosed malignancy and the second leading cause of cancer death in men in the United States. Traditional screening for PCa has included monitoring of prostate specific antigen (PSA) levels and systematic transrectal ultrasound-guided (TRUS) prostate biopsy. Recommendations for PCa screening are evolving with recent advances in multi-parametric MRI (mp-MRI) of the prostate. However, negative findings on mp-MRI of the prostate in patients with suspicion of PCa can lead to uncertainties regarding clinical management. This study therefore aims to evaluate the detection rate of PCa by TRUS biopsy in patients with negative mp-MRI.

Methods: The records of 253 patients without evidence of PCa on mp-MRI performed at the Virginia Commonwealth University Health System between 2018 and 2023 who also underwent TRUS prostate biopsies were retrospectively reviewed. Clinical information including age at mp- MRI, PSA levels, and prostate volume, as well as surgical pathology results, namely presence of malignancy, Gleason score (GS), and percentage of positive cores on biopsy, were recorded for these patients. Ultimately, the incidence of clinically significant PCa (GS ≥ 7) and clinically insignificant PCa (GS 6) detected on TRUS-guided biopsy was determined.

Results: Of 253 patients with negative mp-MRI findings, 126 (49.8%) had PCa at TRUS biopsy. Among these 126 patients, 37 had clinically significant PCa with GS 7-9 (14.6% of patients with negative mp-MRI, 29.4% of those with biopsy-proven PCa), and 89 had clinically insignificant PCa with GS 6 (35.2% of patients with negative mp-MRI, 70.6% of those with biopsy-proven PCa). Of the patients with clinically significant PCa, 89.2% (33 patients) had PCa up to GS 7, 5.41% (2 patients) had PCa up to GS 8, and 5.41% (2 patients) had PCa up to GS 9 on TRUS-
guided biopsy. The remaining 127 patients (50.2% of total patients with negative mp-MRI) had no evidence of PCa on TRUS biopsy. There was no statistically significant difference in age, PSA level, or prostate volume between patients with PCa and without PCa at biopsy.

Conclusion: This retrospective study confirms that a percentage of patients without evidence of PCa at mp-MRI of the prostate may still have clinically significant PCa and may benefit from further screening, including TRUS biopsy. Further research may be of benefit to determine optimal screening for PCa.

Detection Rate of Prostate Cancer at Systematic Prostate Biopsy in Patients with Negative mp-MRI of the Prostate: A Retrospective Study

Comparison of Phased-Array 3.0T and Endorectal 1.5 T Magnetic Resonance Imaging in Detection of Seminal Vesicle Involvement and Extracapsular Extension in Prostate Cancer; Using Pathological Findings at Prostatectomy as a Gold Standard

Abbreviated Breast MRI Protocol: A Feasible Alternative for Breast Screening

OBJECTIVE
Despite rising popularity and performance, studies evaluating the use of LLMs for clinical decision support are lacking. Here, we evaluate ChatGPT 3.5 and 4’s capacity for clinical decision support in radiology via the identification of appropriate imaging services for two important clinical presentations: breast cancer screening and breast pain.
METHODS
We compared ChatGPT's responses to the American College of Radiology (ACR) Appropriateness Criteria for breast pain and breast cancer screening. Our prompt formats included an open-ended (OE) and a select all that apply (SATA) format. Scoring criteria evaluated whether proposed imaging modalities were in accordance with ACR guidelines. Three replicate entries were conducted for each prompt, and the average of these was used to determine final scores.
RESULTS
Both ChatGPT 3.5 and 4 achieved an average OE score of 1.830 (out of 2) for breast cancer screening prompts. ChatGPT 3.5 achieved a SATA average percentage correct of 88.9%, compared to ChatGPT 4’s average percentage correct of 98.4% for breast cancer screening prompts. For breast pain, ChatGPT 3.5 achieved an average OE score of 1.125 (out of 2) and a SATA average percentage correct of 58.3%, as compared to an average OE score of 1.666 (out of 2) and a SATA average percentage correct of 77.7%. 
DISCUSSION
Our results demonstrate the eventual feasibility of using LLMs like ChatGPT for radiologic decision making, with the potential to improve clinical workflow and responsible use of radiology services. More use cases and greater accuracy are necessary to evaluate and implement such tools.


Evaluating GPT as an Adjunct for Radiologic Decision Making: GPT-4 Versus GPT-3.5 in a Breast Imaging Pilot

Background: The EMBARK trial is a phase 3, randomized, study evaluating use of enzalutamide with or without concomitant leuprolide in non-metastatic castrate sensitive prostate cancer patients. Trial enrollment relied upon conventional imaging which under detects metastatic disease in comparison to PSMA-PET imaging. The aim of this post-hoc retrospective analysis was to describe the PSMA-PET findings and survival outcomes in a patient population representative of the EMBARK trial. 

Methods: This was a post-hoc, retrospective analysis of 5 prospective studies of PSMA-PET conducted at UCLA from 2016 to 2021 that included patients with recurrent PCa. Patients were included if they met eligibility EMBARK trial enrollment at the time of their PSMA scan as per the following: Rising PSA above 1.0ng/mL (post RP and SRT) or 2.0ng/mL >nadir (post-RT), PSA doubling time ≤9 months, Serum testosterone ≥150 ng/dL. PSMA PET findings (PROMISE miTNM stage, number of lesions) and survival outcomes were collected from clinical reports. Descriptive statistics (median, range) and Kaplan-Meier modeling (median, Confidence intervals) were used.

Results: From 2002 patients screened, 146 patients were included in the analysis. Median pre-scan PSA levels and PSA doubling time in patients who underwent RP (n=85), dRT (n=22), post-RP SRT (n=39) and overall (n=146) were 2.4 ng/mL (1-72.1), 8.3 ng/mL (2.37-202), 2.58 ng/ml (1.1-32.3), 2.7 ng/mL (1-202), and 3.5 months (1-9), 3.3 months (1-9), 4.4 months (1-9), 3.7 (1-9) months, respectively. PSMA-PET was positive in 80%, 41%, 85%, 83% of RP, dRT, RP + SRT and overall populations, respectively. Poly-metastatic disease (≥5 lesions) was found in 19%, 32%, 21% and 21% of cases, respectively. PSMA-PET detected disease only localized to the prostate fossa (miT+N0M0) in 7%, 32%, 0% and 9%. PSMA-PET detected any distant metastatic disease (miTxNxM1) in 33%, 41% 56% and 40% respectively. PSMA-PET detected metastatic nodal disease (N1 and/or M1a) in 58% 32% 74% and 39% and osseous disease (M1b) in 19% 23% 31% and 23% cases. Twenty-eight patients received androgen receptor-axis therapy (ARSi) or androgen deprivation therapy (ADT) following PSMA-PET had available outcome data. Recurrence free survival in ARSi compared to the ADT cohort was 53 months vs 22 months (p=0.008).
Conclusion: In this “EMBARK-like” cohort of patients with high-risk nmCSPCa and PSA DT<9 months, PSMA-PET detected M1 disease in 40% of patients, over one-fifth of cases presented with 5 or more lesions and those receiving ARSi had significantly improved recurrence free survival. Further studies are needed to assess its independent prognostic value and use for treatment guidance.

PSMA PET findings in an “EMBARK-like” cohort of patients with high-risk non-metastatic hormone-sensitive prostate cancer: A single center post-hoc retrospective analysis

BACKGROUND:
Rheumatoid arthritis (RA) is a chronic autoimmune disease impacting about 1.3 million Americans, with women much more likely to be affected than men. The development of this systemic inflammatory disease is influenced by both genetic and environmental factors. Certain environmental factors, such as diet, can be more readily controlled by individuals, and therefore may serve as more attainable therapeutic targets for preventing and mitigating RA and its symptoms. 

Various foods and nutrients are associated with inflammatory biomarkers1,2,3,17, and thus have been linked with increased or decreased risk of RA. However, these associations have been inconsistent across studies likely due to overall systematic bias, measurement error associated with individual food groups and nutrients, and limited investigations evaluating the relationship between overall dietary patterns and RA in larger sample sizes4,5,6,12. Furthermore, few studies that have examined the impact of overall dietary patterns on RA but have had conflicting results and/or generally involved smaller sample sizes. 

OBJECTIVE:
Our objective is to evaluate the association between dietary quality, as measured by the 2015 Healthy Eating Index (HEI-2015), and risk of incident rheumatoid arthritis (RA) in postmenopausal women.

METHODS: 
109,591 postmenopausal women without baseline RA were prospectively followed as part of the Women’s Health Initiative (WHI) for an average of 8.1 years. Baseline diet was measured using a food frequency questionnaire (FFQ) and diet quality was evaluated using the HEI-2015. Multivariable Cox proportional regression analysis was performed evaluating the association of diet quality with self-reported physician diagnosed RA after adjusting for age, race, education status, income, and body mass index (BMI). 

RESULTS:
During 1,241,532 person-years of follow-up, 5,823 incident RA cases were identified. Compared to quartile 1, quartiles 2, 3, and 4 of the HEI-2015 scores were associated with a reduced RA risk of 3%, 13%, and 18%, respectively (p-trend <0.001). A higher score for total fruits (p-trend=.006), whole fruits (p-trend<.001), total vegetables (p-trend=.004), dark green vegetables (p-trend<.001), whole grain (p-trend=.004), total dairy (p-trend=.004), and seafood/plant protein (p-trend=.015) consumption was significantly associated with lower rates of incident RA independent of age and confounders. Conversely, a higher score for consumption of percent saturated fat (p-trend=.001) was significantly associated with higher rates of incident RA (Table 3).

CONCLUSIONS:
A higher quality diet rich in fruits, vegetables, whole grain, dairy, and seafood/plant protein, is associated with a lower risk of developing RA in postmenopausal women. Meanwhile, a less healthy diet with higher intake of percent saturated fat is associated with higher risk of RA.

Association of Diet Quality with Risk of Incident Rheumatoid Arthritis in the Women’s Health Initiative

Background/Purpose: The purpose of this study was to investigate factors associated with objective cognitive impairment in patients diagnosed with Systemic Lupus Erythematous (SLE). The prevalence of subjective complaints are common, and previous studies have showed a general decline in immediate memory and total memory. 
Methods: This study was conducted using baseline data from ClearMEMory (Clearing Lupus Fog with Memantine). Seventy-nine participants who reported neuropsychiatric symptoms and came for screening were included. The dependent variable was the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS), a brief, age-normalized, individually administered battery to measure cognitive decline or improvement. Potential predictive variables were sex, race, ethnicity, age, ESR, anti-dsDNA antibodies, the polysymptomatic distress scale (PSD) and the hospital anxiety and depression scales (HADS-A, HADS-D). Regression models were run to determine covariates that effect the RBANS total and the RBANS immediate memory. The models examined HADS scores between 6-12 to determine if there was a statistically significant difference when the scores went from normal to depressed. The models used PSD values 12-16 which are values that cross the threshold for diagnosis of fibromyalgia.
Results: Participant’s median age was 51 years, and they were predominantly female (96%), non-Hispanic (94%) and White (70%) (Table 1). We used linear regression to model the RBANS total score. A model including HADS-D, PSD, and race was the most significant (p = 0.0004) (Table 2). As the HADS depression score increased from 6 to 12, the RBANS total decreased by 3.95 points and as the PSD total increased from 12 to 16, the RBANS total decreased by 2.35 points on average. Non-Whites, when compared to Whites had a decrease in the RBANS total by 7.77 points. The most significant model for RBANS immediate memory included the same factors (p = 0.0004, Table 3). 
Conclusion: Results support race, depression, and polysymptomatic distress as significant contributors to the risk of cognitive impairment in patients with SLE. Disease activity did not appreciably affect cognition in this participant sample. As participant scores crossed thresholds for depression or fibromyalgia diagnosis, measurable declines in cognition, particularly immediate memory, were observed. Further studies with different measures of cognition are necessary to understand the impact of race in these models.

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