DAVID JAMES CARPENTER, MD, MHSC

MARIETTA, GA

Research Active
Radiology - Radiation Oncology NPI registered 8+ years 50 publications 2017 – 2026 NPI: 1558865816

Practice Location

677 CHURCH ST NE
MARIETTA, GA 30060-1101

Phone: (770) 793-5000

What does DAVID CARPENTER research?

Dr. Carpenter studies the dynamics of liver transplantation, specifically looking at how factors like timing—such as weekends and nights—affect the availability and use of donor livers. He has investigated over 73,000 liver donations over 13 years to uncover why many of these livers go unused. By identifying systemic issues in health care logistics and staffing, he aims to reduce organ waste and improve the efficiency of liver transplants, helping to increase the number of patients who can benefit from this life-saving procedure.

Key findings

  • Donor livers available on weekends and at night were about 11% more likely to go unused.
  • The likelihood of unused livers was strongest during weekend nights.
  • Addressing logistical and staffing issues could significantly reduce the number of livers that go to waste each year.

Frequently asked questions

Does Dr. Carpenter study liver transplantation?
Yes, Dr. Carpenter focuses on liver transplantation and the factors affecting the utilization of donor livers.
Why do some donor livers go unused?
His research shows that timing, particularly during weekends and nights, plays a significant role in why many donor livers are not utilized.
How can Dr. Carpenter's work help patients?
By addressing the avoidable waste of donor livers, his work could increase the number of available organs for transplantation, directly benefiting patients in need.

Publications in plain English

EXERT-BCN: An Exercise Regimen Designed to Improve Body Composition, Functional Capacity, and Strength After Treatment for Breast Cancer With Nutrition Optimization.

2026

JCO oncology practice

Carpenter DJ, Peluso C, Hilton C, Coopey SB, Gomez J +4 more

Plain English
This study focused on the effects of a specific exercise and nutrition plan on women recovering from breast cancer treatment. Forty-four women participated in a program involving heavy weight training and a diet rich in quality food. The results showed that participants lifted 36.5% more weight, lost about 1.8 kg of body fat, gained 0.5 kg of muscle, and reported significant improvements in their quality of life. Who this helps: This helps breast cancer survivors looking to improve their health and overall well-being after treatment.

PubMed

The Individual and Combined Effects of Warming and Atrazine on Lithobates pipiens Phenotypes: Implications for Frog Declines.

2026

Journal of experimental zoology. Part A, Ecological and integrative physiology

Gavel MJ, Forbes MR, Smith DDN, Darabaner J, Reyes YM +3 more

Plain English
This study looked at how increased temperatures and the chemical atrazine affect the development and health of the common frog (Lithobates pipiens). Researchers found that warmer temperatures speed up frog growth and development but can also harm their ability to move and weaken their immune systems. For example, while tadpoles grew faster in higher temperatures, they developed less effectively if exposed to atrazine at the same time. Who this helps: This research benefits conservationists and environmental scientists working to protect threatened frog populations.

PubMed

Long-term risk of carotid stenosis and cerebrovascular disease after radiation therapy for head and neck cancer.

2025

Cancer

Carpenter DJ, Patel P, Niedzwiecki D, Dillon M, Diaz AK +11 more

Plain English
This study looked at the long-term risks of carotid artery narrowing and strokes in patients who received radiation therapy for head and neck cancer. Researchers found that, over ten years, nearly 30% of these patients developed significant narrowing of their carotid arteries without symptoms, and about 10% suffered strokes or mini-strokes. This is important because it highlights the need for regular monitoring of carotid health in these survivors, as many may not be screened for these risks after treatment. Who this helps: This benefits patients who have undergone radiation therapy for head and neck cancer, as well as their healthcare providers.

PubMed

Genomic classifiers and prognosis of localized prostate cancer: a systematic review.

2025

Prostate cancer and prostatic diseases

Boyer MJ, Carpenter DJ, Gingrich JR, Raman SR, Sirohi D +12 more

Plain English
This study looked at three genomic tests—Decipher, GPS, and Prolaris—to see how well they can predict outcomes for patients with localized prostate cancer, such as recurrence, spread of cancer, and death specifically from prostate cancer. The researchers analyzed data from 39 studies involving over 10,000 patients and found that these tests improved predictions slightly better than traditional methods, although the evidence was not very strong due to various factors like the studies' design and differences in patient treatment. Improving the way doctors can assess prostate cancer risk is important for making better treatment choices. Who this helps: This helps patients with localized prostate cancer and their doctors.

PubMed

Impact of Genomic Classifiers on Risk Stratification and Treatment Intensity in Patients With Localized Prostate Cancer : A Systematic Review.

2025

Annals of internal medicine

Tabriz AA, Boyer MJ, Gordon AM, Carpenter DJ, Gingrich JR +12 more

Plain English
This study looked at how genomic tests can help doctors assess the risk and treatment options for patients with localized prostate cancer. Researchers reviewed 10 studies and found that while many low-risk patients were often still classified as low-risk after testing, some showed that nearly 35% of very low-risk patients were bumped up to a higher risk level. This is important because it can change how patients are treated, affecting decisions like whether to opt for active surveillance or more aggressive treatments. Who this helps: This benefits patients diagnosed with localized prostate cancer and their doctors by providing clearer information on risk and treatment.

PubMed

Grip strength as a surrogate measure of strength, functional, and metabolic parameter increases in breast cancer survivors undergoing an exercise regimen.

2025

Scientific reports

Champ CE, Peluso C, Hilton C, Rosenberg J, Krause R +2 more

Plain English
This study looked at grip strength in 138 women who were being treated for breast cancer and participating in a three-month exercise program. The researchers found that grip strength increased by an average of 12.6% and 3.5 kg after the program, and improvements were also observed in overall body composition and balance. These findings are important because they suggest that grip strength can be a useful measure of health and fitness in breast cancer survivors, which can help guide treatment and rehabilitation efforts. Who this helps: This helps breast cancer survivors and healthcare providers involved in their recovery.

PubMed

Body Composition Benefits Diminish One Year After a Resistance Training Regimen in Breast Cancer Patients, Although Improvements in Strength, Balance, and Mobility Persist.

2025

Journal of functional morphology and kinesiology

Champ CE, Rosenberg J, Peluso C, Hilton C, Krause R +2 more

Plain English
This study looked at how resistance training affects women with breast cancer, specifically focusing on body composition and physical abilities one year after completing a workout program. Researchers found that while improvements in body fat and muscle mass faded after a year, participants still showed better strength, balance, and mobility compared to before they started exercising. This is important because it highlights the long-term benefits of resistance training on physical function, even if the changes in body composition don’t last. Who this helps: This helps breast cancer patients maintain their strength and mobility as they recover.

PubMed

Resistance Training and Lymphedema in Breast Cancer Survivors.

2025

JAMA network open

Shamsesfandabadi P, Shams Esfand Abadi M, Yin Y, Carpenter DJ, Peluso C +5 more

Plain English
This study looked at how resistance training affects lymphedema, a condition that can occur in breast cancer survivors. Researchers found that after three months of strength training, no participants saw a worsening of their lymphedema, and participants gained muscle mass in their arms and had improved fluid balance in their bodies. This is important because it shows that exercise, specifically resistance training, can be safely included in recovery plans for breast cancer survivors without worsening lymphedema. Who this helps: This helps breast cancer survivors dealing with lymphedema.

PubMed

Multi-institutional Outcomes after Stereotactic Radiosurgery for Gastrointestinal Brain Metastases.

2025

Advances in radiation oncology

Qazi JJ, Carpenter DJ, Leng J, Huang CC, Chmura SJ +7 more

Plain English
This study looked at how brain metastases from gastrointestinal cancers compare to those from other types of cancers after patients received a specific type of radiation treatment called stereotactic radiosurgery. Researchers found that patients with gastrointestinal tumors had a median overall survival of only 5.4 months, compared to 10.6 months for those with other types of tumors. This is important because it highlights that gastrointestinal cancer patients might need different treatments or monitoring strategies due to their poorer outcomes. Who this helps: This helps doctors in making better treatment decisions for patients with gastrointestinal brain metastases.

PubMed

Agreement Between Bioelectrical Impedance Analysis and Ultrasound for Measuring Body Composition in Women with Breast Cancer.

2025

Diagnostics (Basel, Switzerland)

Rosenberg J, Natarajan J, Carpenter DJ, Peluso C, Hilton C +1 more

Plain English
This study looked at two methods for measuring body fat in women with breast cancer: bioelectrical impedance analysis (BIA) and ultrasound (US). It found that both methods generally agreed with a strong correlation (r = 0.8), but BIA showed higher body fat percentages in women with a body mass index (BMI) greater than 26 kg/m². This is important because accurate body fat measurement can help tailor treatment plans for better outcomes after breast cancer treatment. Who this helps: This benefits patients with breast cancer and their healthcare providers.

PubMed

Clinical Parameters Associated With Intracranial Progression Burden Following an Initial Stereotactic Radiosurgery Course in a Multi-institutional Brain Metastases Cohort.

2025

Advances in radiation oncology

Huang CC, Carpenter DJ, Leng J, Qazi J, Natarajan B +10 more

Plain English
This study looked at patients treated with stereotactic radiosurgery (SRS) for brain metastases to find out which factors are linked to a greater number of new brain metastases after treatment. They found that out of 1,383 patients, 40% experienced new brain metastases, with 15.9% having 11 or more new ones. Having fewer original brain metastases, not getting immunotherapy before SRS, and receiving immunotherapy after treatment were all factors that helped patients avoid a higher burden of new metastases, which is important because it can mean better survival rates. Who this helps: This information benefits patients facing brain metastases and their doctors by guiding treatment decisions.

PubMed

Effects of the Aquatic Herbicide Diquat on Non-Target Aquatic Biota: A Mesocosm Study.

2025

Archives of environmental contamination and toxicology

Dalton RL, Robinson SA, Bartlett AJ, Sesin V, Ben Othman H +5 more

Plain English
This study looked at the effects of the herbicide diquat on various plants, algae, and small aquatic animals in a controlled outdoor setting. Researchers found that diquat harmed all native and non-native plant species tested, causing them to die or lose most of their biomass. However, it increased the growth of certain algae and helped tadpoles survive and grow better, likely due to the increase in available food. Using a lower amount of diquat could effectively control invasive plants while lessening harm to other aquatic life. Who this helps: This research benefits environmental scientists and conservationists working to balance invasive plant control with the health of local ecosystems.

PubMed

The Dynamic Change in the Neutrophil-Lymphocyte Ratio and Systemic Inflammatory Response Index After Undergoing an Intensive Resistance-Based Exercise Program.

2025

Journal of functional morphology and kinesiology

Dougherty TP, Carpenter DJ, Peluso C, Champ CE

Plain English
This study looked at how a 12-week intensive exercise program affected inflammation markers in women with breast cancer. After the program, participants showed a significant drop in two important markers: the neutrophil-lymphocyte ratio (from 2.26 to 1.99) and the systemic inflammatory response index (from 1.23 to 0.80). About two-thirds of those with improved markers experienced clinically meaningful changes, highlighting the potential benefits of exercise for women with breast cancer. Who this helps: This helps women with breast cancer by showing that exercise may improve their health outcomes.

PubMed

Impact of systemic therapy after stereotactic radiosurgery in patients with limited brain-only metastasis.

2025

Neuro-oncology advances

Qazi JJ, Van Swearingen AED, Carpenter DJ, Broadwater G, Leng JX +10 more

Plain English
This study looked at how different timing and use of systemic therapy (ST) after a specific kind of radiation treatment (stereotactic radiosurgery) affects patients with brain-only cancer metastases. Researchers found that patients who received ST for up to 3 months after their treatment lived about 25 months, while those who received it for over 3 months lived around 28 months, and those who didn't get any ST lived only about 11 months. These findings highlight the importance of considering systemic therapy after radiation, as it can significantly improve survival rates. Who this helps: Patients with brain-only cancer metastases.

PubMed

Radiation technique and outcomes following moderately hypofractionated treatment of low risk prostate cancer: a secondary analysis of RTOG 0415.

2024

Prostate cancer and prostatic diseases

Carpenter DJ, Salama JK, Lee WR, Boyer MJ

Plain English
This study looked at two methods of giving radiation therapy to men with low-risk prostate cancer: intensity-modulated radiation therapy (IMRT) and three-dimensional conformal radiation therapy (3D-CRT). The researchers followed over 1,000 patients for about 5.8 years and found no significant differences in survival rates or serious side effects between the two methods. This is important because it shows that both techniques are equally effective and safe for treating low-risk prostate cancer. Who this helps: This helps patients with low-risk prostate cancer and their doctors in making informed treatment choices.

PubMed

EXERT-BC: A pilot study of an exercise regimen designed to improve functional mobility, body composition, and strength after the treatment for breast cancer.

2024

Cancer medicine

Carpenter DJ, Peluso C, Hilton C, Velasquez F, Annichine A +6 more

Plain English
This study looked at a special exercise program for women who have survived breast cancer, focusing on how it affects their strength, body composition, and mobility. Over three months, 40 women participated in high-intensity resistance training and showed significant results: body fat decreased significantly, muscle mass increased, and measures of strength and physical function improved sharply, all with high attendance and no serious safety issues. This matters because such exercise programs can greatly enhance the quality of life and physical health for breast cancer survivors. Who this helps: Breast cancer survivors looking to improve their fitness and well-being after treatment.

PubMed

Determinants of Symptomatic Intracranial Progression After an Initial Stereotactic Radiosurgery Course.

2024

Advances in radiation oncology

Leng JX, Carpenter DJ, Huang C, Qazi J, Arshad M +8 more

Plain English
This study looked at patients with brain metastases who underwent a specific treatment called stereotactic radiosurgery (SRS) to see how their health progressed over time, especially focusing on the impact of having neurological symptoms. Out of 1,383 patients, about 14% had symptoms when their condition worsened, and these patients lived less long on average—10.2 months compared to 17.9 months for those without symptoms. Understanding these connections helps doctors better monitor patients after treatment and improve their care. Who this helps: Patients with brain metastases and their healthcare providers.

PubMed

Current Strengths and Weaknesses of ChatGPT as a Resource for Radiation Oncology Patients and Providers.

2024

International journal of radiation oncology, biology, physics

Floyd W, Kleber T, Carpenter DJ, Pasli M, Qazi J +6 more

Plain English
This study evaluated how well ChatGPT, an AI tool, provides answers and information about radiation oncology for patients and healthcare providers. It found that only 39.7% of responses to patient questions were accurate, and 50.6% of the studies it listed were made up. These results show that while AI can be useful, ChatGPT is not a reliable source of information for radiation oncology at this time. Who this helps: Patients and doctors looking for accurate information about radiation treatments and options.

PubMed

Impact ofmutations on brain metastasis control in non-small cell lung cancer patients undergoing stereotactic radiosurgery.

2024

Journal of radiosurgery and SBRT

Leng JX, Su C, Carpenter DJ, Floyd W, Vaios E +8 more

Plain English
This study looked at whether mutations in a gene called TP53 affect how long patients with brain metastases from non-small cell lung cancer survive after receiving a specific type of radiation treatment known as stereotactic radiosurgery (SRS). Among the 255 patients analyzed, 144 had a TP53 mutation. While overall survival rates were similar regardless of TP53 status, those with the mutation had a trend toward longer periods without local brain progression, with an average of about 62.9 months compared to 29.4 months for those without the mutation. Who this helps: This research benefits patients with non-small cell lung cancer and their doctors by providing insights that could influence treatment decisions.

PubMed

Effects of perfluoroalkyl sulfonic acids on developmental, physiological, and immunological measures in northern leopard frog tadpoles.

2024

Chemosphere

Rohonczy J, Forbes MR, Gilroy ÈAM, Carpenter DJ, Young SD +5 more

Plain English
This study looked at how two chemicals, PFBS and PFHxS, affect the growth and health of northern leopard frog tadpoles. While the tadpoles generally grew normally, those exposed to high levels (1000 micrograms per liter) of these chemicals showed signs of liver stress and changes in fat metabolism, and they were more likely to appear female at low exposure levels (0.1 micrograms per liter). These findings are important because they indicate that these chemicals can disrupt the health and development of amphibians, which can help assess risks to the environment. Who this helps: This helps environmental scientists and wildlife conservationists by providing crucial data on the impact of pollutants on amphibian populations.

PubMed

Resistance Training for Patients with Cancer: A Conceptual Framework for Maximizing Strength, Power, Functional Mobility, and Body Composition to Optimize Health and Outcomes.

2023

Sports medicine (Auckland, N.Z.)

Champ CE, Carpenter DJ, Diaz AK, Rosenberg J, Ackerson BG +1 more

Plain English
This study looked at how resistance training can benefit cancer patients by improving their strength, mobility, and overall health. Researchers found that personalized, high-intensity exercises can enhance muscle and bone health, boost metabolism, and reduce injury risk. This is important because it shows that proper exercise programs can lead to better health outcomes for cancer patients. Who this helps: Cancer patients seeking to improve their strength and health during and after treatment.

PubMed

What is appropriate target delineation for MRI-based brachytherapy for medically inoperable endometrial cancer?

2023

Brachytherapy

Carpenter DJ, Stephens SJ, Ayala-Peacock DN, Shenker RF, Raffi J +3 more

Plain English
This study looked at how effective a specific radiation treatment is for patients with medically inoperable endometrial cancer. Researchers found that 73.6% of patients survived for at least a year, and 93.8% had no signs of cancer progression in the same period. Additionally, most patients (72%) reported no severe side effects from the treatment, which is promising for its safety and effectiveness. Who this helps: This benefits patients with medically inoperable endometrial cancer seeking effective treatment options.

PubMed

Outcomes in Patients with Intact and Resected Brain Metastasis Treated with 5-Fraction Stereotactic Radiosurgery.

2023

Advances in radiation oncology

Carpenter DJ, Fairchild AT, Adamson JD, Fecci PE, Sampson JH +7 more

Plain English
This study examined the outcomes of patients with brain metastases who were treated with a specific type of radiation therapy called five-fraction stereotactic radiosurgery (HF-SRS), either with or without surgical removal of the tumors. The researchers looked at 445 patients and found that those whose tumors were removed (resected) lived longer, with a median survival of 12.8 months compared to 5.1 months for those whose tumors were not removed (intact). Additionally, the likelihood of new brain problems was higher in patients who had resected tumors, with a 24-month rate of 50% compared to 35.7% for intact tumors. Who this helps: This research helps patients with brain metastases and their doctors in deciding treatment options.

PubMed

Intracranial and Extracranial Progression and Their Correlation With Overall Survival After Stereotactic Radiosurgery in a Multi-institutional Cohort With Brain Metastases.

2023

JAMA network open

Carpenter DJ, Leng J, Arshad M, Giles W, Kirkpatrick JP +4 more

Plain English
This study looked at how the progression of brain metastases (intracranial progression) and the spread of cancer to other parts of the body (extracranial progression) affect the overall survival of patients after they received a type of radiation treatment called stereotactic radiosurgery. Among 1,383 patients, the study found that 50% had intracranial progression and 58% had extracranial progression, which were linked to nearly half of the deaths observed. The average survival time after treatment was about 10 months, with intracranial progression being the strongest predictor of how long patients lived afterward. Who this helps: This research helps doctors better understand how progression affects survival, guiding treatment decisions for patients with brain metastases.

PubMed

Clinical Factors Associated With 30-Day Mortality Among Patients Undergoing Radiation Therapy for Brain Metastases.

2023

Advances in radiation oncology

Natesan D, Carpenter DJ, Giles W, Oyekunle T, Niedzwiecki D +3 more

Plain English
This study looked at patients receiving radiation therapy for brain metastases to understand who might have a higher risk of dying within 30 days after treatment. Out of 636 patients, 75 (about 11.7%) died within 30 days. Key risk factors for early death included having worsening disease in the chest, liver, or adrenal glands, and being treated as an inpatient, while having better overall health status or accessing outpatient palliative care improved chances of survival. Who this helps: This information helps doctors better identify which patients may not benefit from radiation therapy and may need different care options.

PubMed

Effect of Large Prostate Volume on Efficacy and Toxicity of Moderately Hypofractionated Radiation Therapy in Patients With Prostate Cancer.

2022

Advances in radiation oncology

Natesan D, Carpenter DJ, Floyd W, Oyekunle T, Niedzwiecki D +5 more

Plain English
This study looked at how the size of the prostate affects the side effects of a specific type of radiation therapy for prostate cancer. Researchers found that patients with larger prostate volumes experienced more late-stage genitourinary problems—59% of these patients had significant issues compared to 48% of those with smaller prostates. While larger prostate size didn't change the effectiveness of the treatment, it did increase the risk of side effects, specifically leading to earlier onset of these issues. Who this helps: This helps patients with prostate cancer and their doctors in understanding the potential risks of treatment based on prostate size.

PubMed

In Regard to Schumacher et al.

2022

International journal of radiation oncology, biology, physics

Carpenter DJ, Diaz AK, Beriwal S, Hyde PN, Champ CE

PubMed

Laryngotracheal stenosis: Mechanistic review.

2022

Head & neck

Carpenter DJ, Hamdi OA, Finberg AM, Daniero JJ

Plain English
This review studied how wounds heal in two types of airway narrowing: one caused by prolonged intubation (iatrogenic laryngotracheal stenosis) and another that happens without an obvious cause (idiopathic subglottic stenosis). Both conditions involve excessive scarring that can block airways, making breathing difficult. By understanding how these healing processes go wrong, researchers aim to find new treatments that can improve care and prevent these conditions from developing in the first place. Who this helps: This helps patients with airway problems and doctors treating them.

PubMed

Prognostic Model for Intracranial Progression after Stereotactic Radiosurgery: A Multicenter Validation Study.

2022

Cancers

Carpenter DJ, Natarajan B, Arshad M, Natesan D, Schultz O +12 more

Plain English
This study looked at how well a tool can predict whether patients will experience worsening brain conditions after undergoing stereotactic radiosurgery (a type of targeted radiation therapy) for brain tumors. Researchers tracked 890 patients and found that those deemed high-risk for complications had a significantly shorter time without new issues—7.6 months compared to 13.9 months for low-risk patients. This information is important because it helps doctors know which patients might need closer monitoring after their treatment. Who this helps: This helps patients and doctors by providing clearer guidelines on monitoring after treatment.

PubMed

Impact of Race on Outcomes of High-Risk Patients With Prostate Cancer Treated With Moderately Hypofractionated Radiotherapy in an Equal Access Setting.

2022

Federal practitioner : for the health care professionals of the VA, DoD, and PHS

Carpenter DJ, Natesan D, Floyd RW, Oyekunle T, Niedzwiecki D +7 more

Plain English
This study looked at the effects of a specific cancer treatment called moderately hypofractionated radiotherapy (MHRT) on high-risk prostate cancer patients, particularly focusing on whether outcomes differed between African American and White patients. Researchers found that after treatment, both groups had similar survival rates over five years: 73% for African American patients and 77% for White patients. The treatment was generally well-tolerated, with low rates of serious side effects. Who this helps: This benefits both high-risk prostate cancer patients and their doctors by ensuring equitable treatment outcomes regardless of race.

PubMed

Tissue Determinants of Human NK Cell Development, Function, and Residence.

2020

Cell

Dogra P, Rancan C, Ma W, Toth M, Senda T +12 more

Plain English
This study examined how the location of cells in the body influences the development and behavior of natural killer (NK) cells, which play a key role in fighting infections and cancer. Researchers analyzed NK cells from the blood and various tissues of 60 people and found that mature NK cells, which are more effective at fighting infections, are mainly located in the blood and organs like the spleen and lungs. In contrast, younger NK cells are found in lymph nodes and the intestines and have less ability to fight infections. Who this helps: This research benefits patients with infections and cancer by improving understanding of how their immune cells work.

PubMed

Effects of Herbicides on Flowering.

2020

Environmental toxicology and chemistry

Carpenter DJ, Mathiassen SK, Boutin C, Strandberg B, Casey CS +1 more

Plain English
This study examined how different herbicides affect the flowering of nine wild plant species in greenhouses in Canada and Denmark. The researchers found that using herbicides at 5% of the recommended levels significantly delayed blooming and reduced the number of flowers produced for many plants, with glyphosate causing the most harm, including plant death. This matters because these effects can disrupt wildflower populations, which are crucial for pollinators and the overall health of ecosystems. Who this helps: This helps conservationists and ecologists working to protect plant and pollinator populations.

PubMed

Single cell analysis reveals distinct immune landscapes in transplant and primary sarcomas that determine response or resistance to immunotherapy.

2020

Nature communications

Wisdom AJ, Mowery YM, Hong CS, Himes JE, Nabet BY +20 more

Plain English
This study looked at how the immune systems of different types of tumors respond to treatments, specifically immunotherapy combined with radiotherapy. Researchers found that while transplant tumors (grown in labs) responded well to a specific treatment that blocks a protein called PD-1, primary tumors (those found in the body) did not show the same benefit, indicating key differences in their immune environments. This is important because it helps identify which patients with sarcomas may actually benefit from these treatments based on their tumor characteristics. Who this helps: This helps patients with sarcomas by providing insights into more effective treatment options.

PubMed

Utility of Routine Spirometry Measures for Surveillance of Idiopathic Subglottic Stenosis.

2019

JAMA otolaryngology-- head & neck surgery

Carpenter DJ, Ferrante S, Bakos SR, Clary MS, Gelbard AH +1 more

Plain English
This study looked at whether a simple breathing test, called peak expiratory flow (PEF), can effectively monitor the worsening of idiopathic subglottic stenosis, a condition that narrows the airway. The researchers found that PEF is a reliable indicator, with a scoring system showing a high accuracy (84% sensitivity and 82% specificity) at a cutoff value of 4.4 liters per second. This matters because it provides an easy method for doctors to track disease progression and decide when surgery might be needed. Who this helps: This benefits patients with idiopathic subglottic stenosis and their doctors.

PubMed

Microanatomical dissection of human intestinal T-cell immunity reveals site-specific changes in gut-associated lymphoid tissues over life.

2019

Mucosal immunology

Senda T, Dogra P, Granot T, Furuhashi K, Snyder ME +5 more

Plain English
This study examined how T-cells, which are important for the immune response, are distributed in different parts of the human gut as people age. Researchers analyzed gut tissue samples from 68 individuals of varying ages and found that certain types of T-cells become less common in children as they get older, especially in the jejunum and ileum, while some T-cells remain stable in the colon. Understanding these changes is important because it can help improve our knowledge of how age affects immune responses, which could aid in predicting and treating gut-related diseases. Who this helps: This benefits patients and doctors by enhancing the understanding of how age impacts gut immunity.

PubMed

Radiation Records in the National Cancer Database: Variations in Coding and/or Practice Can Significantly Alter Survival Results.

2019

JCO clinical cancer informatics

Jacobs CD, Carpenter DJ, Hong JC, Havrilesky LJ, Sosa JA +1 more

Plain English
This study looked at how some records of radiation therapy for patients with advanced uterine cancer were inaccurately reported in a national database. Out of nearly 14,300 patients, about 16% had some form of inconsistent data, and those with these inaccuracies had a five-year survival rate of 51.3% compared to 58% for those without issues. This discrepancy underscores the importance of accurate data for understanding treatment outcomes and improving patient survival rates. Who this helps: This benefits patients undergoing treatment for uterine cancer and doctors involved in their care.

PubMed

Effects of Sublethal Doses of Herbicides on the Competitive Interactions Between 2 Nontarget Plants, Centaurea cyanus L. and Silene noctiflora L.

2019

Environmental toxicology and chemistry

Boutin C, Montroy K, Mathiassen SK, Carpenter DJ, Strandberg B +1 more

Plain English
This study looked at how two plants, Centaurea cyanus and Silene noctiflora, compete with each other and how sublethal doses of two herbicides (glyphosate and metsulfuron methyl) affect this competition. The researchers found that as the number of plants increased, both species were negatively impacted, but C. cyanus consistently outperformed S. noctiflora. Understanding these interactions is important because it helps assess the ecological risks of using herbicides in farming, ensuring better outcomes for plant life. Who this helps: Farmers and environmental scientists.

PubMed

Changes on Midchemoradiation Therapy Fluorodeoxyglucose Positron Emission Tomography for Cervical Cancer Are Associated with Prognosis.

2019

International journal of radiation oncology, biology, physics

Carpenter DJ, Jacobs CD, Wong TZ, Craciunescu O, Chino JP

Plain English
This study examined how changes in imaging during cancer treatment can predict outcomes for women with cervical cancer. It found that certain measures taken during treatment, particularly total lesion glycolysis (TLG), were linked to survival rates; for example, a higher TLG was associated with a 35% increased risk of death. This information is important because it can help doctors decide if patients need more intensive treatment based on their early response to therapy. Who this helps: Patients with high-risk cervical cancer and their healthcare providers.

PubMed

Computational Analysis of the Mature Unilateral Cleft Lip Nasal Deformity on Nasal Patency.

2019

Plastic and reconstructive surgery. Global open

Frank-Ito DO, Carpenter DJ, Cheng T, Avashia YJ, Brown DA +3 more

Plain English
This study examined how nasal obstructions vary in patients with unilateral cleft lip nasal deformity (uCLND) compared to those without clefts. Researchers analyzed the nasal airflow and structure of 21 people and found that uCLND patients had noticeable differences in the size and function of their nasal passages. Specifically, uCLND patients had a median nasal obstruction symptom score of 67.5, indicating significant breathing difficulties. Who this helps: This research benefits patients with cleft lip deformities by highlighting their unique nasal issues and helping doctors improve treatment strategies.

PubMed

Neutrophils promote tumor resistance to radiation therapy.

2019

Proceedings of the National Academy of Sciences of the United States of America

Wisdom AJ, Hong CS, Lin AJ, Xiang Y, Cooper DE +16 more

Plain English
This study looked at how neutrophils, a type of immune cell, affect the success of radiation therapy in treating cervical cancer patients. Researchers found that patients who had lower neutrophil counts after starting chemotherapy and radiation had better outcomes, with higher rates of controlling the tumor and surviving without the cancer spreading. Additionally, experiments on mice showed that removing neutrophils before radiation therapy made the treatment more effective. Who this helps: This helps cancer patients undergoing radiation therapy, doctors treating them, and researchers exploring new treatment strategies.

PubMed

Tissue-Resident Memory T Cells Mediate Immune Homeostasis in the Human Pancreas through the PD-1/PD-L1 Pathway.

2019

Cell reports

Weisberg SP, Carpenter DJ, Chait M, Dogra P, Gartrell-Corrado RD +12 more

Plain English
This study looked at a type of immune cell called tissue-resident memory T cells (TRMs) in the human pancreas. Researchers found that these TRMs help keep the immune system balanced by interacting with other immune cells, specifically macrophages, and that their activity is influenced by a pathway called PD-1/PD-L1. In cases of chronic pancreatitis, the TRMs had lower activity, which suggests that understanding these interactions could improve treatments for inflammation-related diseases. Who this helps: This helps patients with chronic pancreatitis and other inflammatory conditions.

PubMed

Deceased Brain Dead Donor Liver Transplantation and Utilization in the United States: Nighttime and Weekend Effects.

2019

Transplantation

Carpenter DJ, Chiles MC, Verna EC, Halazun KJ, Emond JC +2 more

Plain English
Using 13 years of national data on over 73,000 donor livers, this study found that livers available on weekends and at night were about 11% more likely to go unused even after accounting for organ quality — and the effect was strongest on weekend nights. The findings point to staffing patterns, logistics, and operational capacity as contributors to organ waste, beyond donor characteristics alone. Addressing these systemic inefficiencies could recover a meaningful number of usable livers each year.

PubMed

The risk of carotid stenosis in head and neck cancer patients after radiation therapy.

2018

Oral oncology

Carpenter DJ, Mowery YM, Broadwater G, Rodrigues A, Wisdom AJ +5 more

Plain English
This study looked at the risk of narrowing of the carotid arteries in patients with head and neck cancer who received radiation therapy. Researchers found that about 29% of these patients experienced carotid artery narrowing within eight years after treatment. Factors like diabetes, smoking, and heart disease increased the risk of this condition, which can lead to serious health issues like strokes. Who this helps: This helps patients who have undergone head and neck cancer treatment and their doctors in managing their long-term health.

PubMed

Factors leading to the discard of deceased donor kidneys in the United States.

2018

Kidney international

Mohan S, Chiles MC, Patzer RE, Pastan SO, Husain SA +5 more

Plain English
This study examined why kidneys from deceased donors in the U.S. are often discarded instead of used for transplant. Out of over 212,000 kidneys studied, about 36,700 were discarded, with the most common reason being poor biopsy results, affecting 38.2% of discarded kidneys. The findings show that kidneys from older, female, Black, or unhealthy donors are more likely to be thrown away, highlighting the need to better understand and improve the use of these potentially viable organs for transplant. Who this helps: Patients waiting for kidney transplants.

PubMed

Extemporaneous preparation strategy for early phase clinical studies.

2018

International journal of pharmaceutics

Gullapalli RP, Mazzitelli CL, Charriez CM, Carpenter DJ, Crean RD +2 more

Plain English
This study looked at a new way to prepare experimental drugs at the site where they are being tested, specifically focusing on a drug called DNS-7801. The researchers found that using a special mixture helped make the drug stable and effective for both younger and older participants, leading to consistent results in how much of the drug was absorbed in the body. This method allows for flexibility in dosing, which can speed up drug development and ensure that patients receive the right amount of medicine. Who this helps: This helps patients participating in clinical trials by ensuring they receive well-prepared and effective medications.

PubMed

Human Lymph Nodes Maintain TCF-1Memory T Cells with High Functional Potential and Clonal Diversity throughout Life.

2018

Journal of immunology (Baltimore, Md. : 1950)

Miron M, Kumar BV, Meng W, Granot T, Carpenter DJ +11 more

Plain English
This study examined memory T cells, a type of immune cell, in human lymph nodes to see how they differ from similar cells in the blood and other body parts. Researchers found that T cells in the lymph nodes are better at renewing themselves and show more variety in their ability to recognize different threats than those in the blood. This is important because it suggests that lymph nodes are key areas for improving immune responses, especially in cancer treatments that use immunotherapy. Who this helps: This benefits patients undergoing immunotherapy, doctors treating cancer, and researchers studying immune responses.

PubMed

Functional heterogeneity of human tissue-resident memory T cells based on dye efflux capacities.

2018

JCI insight

Kumar BV, Kratchmarov R, Miron M, Carpenter DJ, Senda T +4 more

Plain English
This study examined different types of tissue-resident memory T cells (TRMs), a part of the immune system that helps quickly fight off infections in various body tissues. Researchers found two main types of TRMs: one type, which can eliminate fluorescent dyes (called efflux(+) TRMs), showed reduced turnover and less inflammation response compared to the other type (efflux(-) TRMs). This finding highlights that TRMs have varied abilities to respond to infections and maintain long-lasting immunity, which can help in designing better treatments for infections. Who this helps: Patients with infections or those needing improved immune responses.

PubMed

Disagreement in middle ear volume estimation between tympanometry and three-dimensional volume reconstruction in the context of tympanic membrane perforation.

2017

Journal of otology

Carpenter DJ, Tucci DL, Kaylie DM, Frank-Ito DO

Plain English
This study looked at how two different methods for measuring middle ear volume (the space inside the ear behind the eardrum) compare when used on patients with holes in their eardrums. The researchers found that the measurements from the two methods often disagreed significantly, especially with larger volumes; for example, differences were particularly notable in groups with larger average ear volumes where p-values were as low as 0.0024. This matters because using different techniques could lead to different conclusions about a patient's condition, which could affect treatment decisions. Who this helps: This helps doctors who diagnose and treat ear conditions.

PubMed

The anatomic determinants of conductive hearing loss secondary to tympanic membrane perforation.

2017

Journal of otology

Carpenter DJ, Tucci DL, Kaylie DM, Frank-Ito DO

Plain English
This study looked at how the size of a hole in the eardrum and the volume of the middle ear affect hearing loss. Researchers found that larger eardrum holes resulted in an average hearing loss of about 32 decibels, while smaller holes resulted in a loss of about 16 decibels. They also discovered that hearing loss increased with more severe ear conditions (cholesteatoma), particularly at certain frequencies. Who this helps: This information benefits patients with ear conditions and their doctors, helping them understand the impact of eardrum perforations on hearing.

PubMed

Temporal bone anatomy characteristics in superior semicircular canal dehiscence.

2017

Journal of otology

de Jong MA, Carpenter DJ, Kaylie DM, Piker EG, Frank-Ito DO

Plain English
This study looked at the structure of temporal bones in patients with a condition called superior semicircular canal dehiscence (SCD), which can cause dizziness. Researchers found that patients with SCD had a lower volume (16,343 mm³) compared to those without it (21,484 mm³), but a larger surface area for the bones. Understanding these differences helps improve the diagnosis and management of SCD, ultimately benefiting patients with this condition. Who this helps: Patients with dizziness and SCD.

PubMed

Frequent Co-Authors

Joseph K Salama John P Kirkpatrick Scott R Floyd Colin E Champ Chris Peluso Zachary J Reitman Dustin J Carpenter Muzamil Arshad Steven J Chmura Trey C Mullikin

Physician data sourced from the NPPES NPI Registry . Publication data from PubMed . Plain-English summaries generated by AI. Not medical advice.