DR. WILLIAM LEE SHAFFER, M.D.

CORPUS CHRISTI, TX

Research Active
Internal Medicine - Nephrology NPI registered 21+ years 19 publications 1945 – 2026 NPI: 1972506913

Practice Location

1521 S STAPLES ST
CORPUS CHRISTI, TX 78404-3154

Phone: (361) 887-8451

What does WILLIAM SHAFFER research?

Dr. Shaffer's research largely revolves around lung cancer, particularly how specific genetic mutations affect the effectiveness of various treatments. He studies mutations like EGFR-T790M and EGFR-C797S, which hinder the efficacy of medication in lung cancer patients, while also identifying other drugs that can prove more effective against these mutations. In addition to cancer, he explores other areas of medicine, including genetic disorders such as MELAS syndrome and anatomical variations like the persistent sciatic artery, shedding light on their impacts on treatment approaches. His work also involves the behaviors of feedlot cattle, contributing to agricultural practices to enhance efficiency.

Key findings

  • In a study on lung cancer mutations, 69.2% of patients with the EGFR-K745_E746insIPVAIK mutation responded positively to various EGFR inhibitors, showing significant efficacy despite varying response durations.
  • Researchers discovered that in patients with lung cancer, the mutations EGFR-T790M and EGFR-C797S can substantially reduce the effectiveness of certain medications like mobocertinib, but drugs like furmonertinib were found to better overcome these resistance issues.
  • Genetic factors accounted for heritability values between 0.35 and 0.63 for feed intake behaviors and between 0.54 and 0.88 for water intake behaviors among feedlot cattle, indicating significant genetic influence on these traits.
  • A study on umbilical artery variability revealed that 73% of fetuses with a single umbilical artery were missing the left artery, and that complex congenital issues were only associated with the absence of the left artery.

Frequently asked questions

Does Dr. Shaffer study lung cancer?
Yes, Dr. Shaffer focuses on how genetic mutations in lung cancer affect treatment strategies and the effectiveness of various medications.
What rare conditions has Dr. Shaffer researched?
Dr. Shaffer has researched several rare conditions, including MELAS syndrome, which causes neurological issues, and extramedullary plasmacytoma, a type of tumor.
Is Dr. Shaffer's work relevant to cancer patients?
Absolutely, his studies provide important insights that help doctors improve treatment plans for lung cancer patients based on specific genetic profiles.
What agricultural aspects does Dr. Shaffer investigate?
He studies the heritability of feeding and drinking behaviors in cattle, which assists farmers in enhancing livestock management and farming efficiency.

Publications in plain English

Beyond the surface: a collaborative effort for free skin cancer screenings in an underserved community.

2026

BMC public health

Lovasz D, Kan B, Martin EA, Riva H, Oke A +10 more

PubMed

The Impact of On-Target Resistance Mediated by EGFR-T790M or EGFR-C797S on EGFR Exon 20 Insertion Mutation Active Tyrosine Kinase Inhibitors.

2024

JTO clinical and research reports

Kobayashi IS, Shaffer W, Viray H, Rangachari D, VanderLaan PA +2 more

Plain English
This study looked at how certain mutations in lung cancer can make treatments less effective. Researchers tested three medications (mobocertinib, poziotinib, and zipalertinib) to see how well they work against lung cancers with specific mutations. They found that the mutations EGFR-T790M and EGFR-C797S can make some drugs much less effective, while other drugs like furmonertinib and sunvozertinib were better at overcoming these resistance issues. Who this helps: This research benefits patients with lung cancer who have specific genetic mutations.

PubMed

Heritability and variance component estimation for feed and water intake behaviors of feedlot cattle.

2023

Journal of animal science

Dressler EA, Shaffer W, Bruno K, Krehbiel CR, Calvo-Lorenzo M +7 more

Plain English
This study looked at how much of the way cattle eat and drink is influenced by their genetics. Researchers analyzed data from 830 cattle and found that behaviors related to feed intake had heritability values between 0.35 and 0.63, while water intake behaviors had heritability values ranging from 0.54 to 0.88. Understanding these behaviors is important because it can help cattle breeders improve how efficiently their animals use feed and water, which affects overall farm profitability and sustainability. Who this helps: This benefits cattle farmers and breeders.

PubMed

EGFR exon 19 insertion EGFR-K745_E746insIPVAIK and others with rare XPVAIK amino-acid insertions: Preclinical and clinical characterization of the favorable therapeutic window to all classes of approved EGFR kinase inhibitors.

2023

Lung cancer (Amsterdam, Netherlands)

Shaffer W, Kobayashi IS, Sentana-Lledo D, Sundararaman S, Lee MD +4 more

Plain English
This study looked at a rare type of mutation in lung cancer called EGFR-K745_E746insIPVAIK, which is less common than other mutations but may respond well to existing cancer drugs known as EGFR inhibitors. They found that 69.2% of patients with this mutation responded to treatment with these drugs, similar to patients with other known mutations, which could help healthcare providers make better treatment choices. Understanding how these rare mutations react to treatment is important for improving care and outcomes for patients. Who this helps: Patients with lung cancer who have rare EGFR mutations.

PubMed

Atypical Presentation of Extramedullary Plasmacytoma.

2018

Ochsner journal

Wallace E, Stewart Z, Theriot D, Shaffer W, Guillory S +3 more

Plain English
This study looked at a rare type of tumor called extramedullary plasmacytoma in a 60-year-old woman who experienced unusual abdominal pain and swelling. Imaging showed a large mass in her abdomen, and after treatment including radiation and chemotherapy, she developed new tumors three years later, leading to a switch to palliative care. This is significant because it highlights an atypical case where this type of tumor did not display the usual signs of a related condition, multiple myeloma, showing the need for careful diagnosis and management in similar patients. Who this helps: This helps doctors and patients dealing with rare tumors to better understand diagnosis and treatment options.

PubMed

Persistent Sciatic Artery: A Favorable Anatomic Variant in a Setting of Trauma.

2017

Ochsner journal

Shaffer W, Maher M, Maristany M, Ustunsoz B, Spieler B

Plain English
This study focused on a rare condition called a persistent sciatic artery (PSA), which is an artery that doesn't regress as it normally should during development. The researchers reported a case where this condition actually helped a patient who suffered a gunshot wound to the thigh, allowing for an unexpectedly positive outcome. While PSAs are usually not significant when found during scans, understanding the patient's unique symptoms and artery structure can guide better treatment choices. Who this helps: This benefits patients with unique blood vessel structures, especially those who have experienced trauma.

PubMed

Mitochondrial Encephalomyopathy With Lactic Acidosis and Stroke-Like Episodes-MELAS Syndrome.

2017

Ochsner journal

Henry C, Patel N, Shaffer W, Murphy L, Park J +1 more

Plain English
This study focused on a rare genetic disorder called MELAS syndrome, which causes problems in the nervous system and muscles, including stroke-like symptoms. The researchers described a 28-year-old woman with unusual stroke-like signs and a family history of similar issues, highlighting how her symptoms came and went over time along with specific changes in her brain scans. Recognizing MELAS is crucial because it can be confused with other disorders, and better imaging techniques may lead to more effective treatments in the future. Who this helps: This helps patients with MELAS syndrome and their doctors.

PubMed

The American Academy of Orthopaedic Surgeons Evidence-Based Clinical Practice Guideline on Surgical Management of Osteoarthritis of the Knee.

2016

The Journal of bone and joint surgery. American volume

McGrory B, Weber K, Lynott JA, Richmond JC, Davis CM +22 more

PubMed

The American Academy of Orthopaedic Surgeons evidence-based guideline on management of anterior cruciate ligament injuries.

2015

The Journal of bone and joint surgery. American volume

Shea KG, Carey JL, Richmond J, Sandmeier R, Pitts RT +21 more

PubMed

The American Academy of Orthopaedic Surgeons Evidence-Based Guideline on Management of Hip Fractures in the Elderly.

2015

The Journal of bone and joint surgery. American volume

Brox WT, Roberts KC, Taksali S, Wright DG, Wixted JJ +27 more

PubMed

The American Academy of Orthopaedic Surgeons Evidence-Based Guideline on Detection and Nonoperative Management of Pediatric Developmental Dysplasia of the Hip in Infants up to Six Months of Age.

2015

The Journal of bone and joint surgery. American volume

Mulpuri K, Song KM, Gross RH, Tebor GB, Otsuka NY +20 more

PubMed

Variation in surgical decision making for degenerative spinal disorders. Part I: lumbar spine.

2005

Spine

Irwin ZN, Hilibrand A, Gustavel M, McLain R, Shaffer W +3 more

Plain English
This study looked at how different surgeons decide on surgeries for certain back problems related to the lower spine. They found that there are significant differences in treatment approaches based on factors like surgeons’ age and background. For instance, younger surgeons preferred using certain techniques more often and orthopedists recommended fusion surgery more than neurosurgeons, especially in cases of scoliosis with stenosis. Who this helps: This helps patients with degenerative spine disorders by highlighting the variability in treatment, which can lead to more informed decisions about their care.

PubMed

Variation in surgical decision making for degenerative spinal disorders. Part II: cervical spine.

2005

Spine

Irwin ZN, Hilibrand A, Gustavel M, McLain R, Shaffer W +3 more

Plain English
This study looked at how different surgeons decide on surgical approaches for cervical spine diseases, which involve the neck area of the spine. Researchers found that while all surgeons agreed on treating single-level disc herniations (with 28 of 29 recommending surgery), there were significant differences in how they approached other conditions. Notably, younger surgeons were more likely to suggest using additional instruments during surgery, especially for multilevel stenosis with myelopathy, indicating that age and training may influence treatment decisions. Who this helps: This information benefits both patients needing spine surgery and doctors making treatment choices.

PubMed

Single umbilical artery: does it matter which artery is missing?

1995

American journal of obstetrics and gynecology

Abuhamad AZ, Shaffer W, Mari G, Copel JA, Hobbins JC +1 more

Plain English
This study looked at whether the side of the missing artery (left or right) in fetuses with a single umbilical artery affects any congenital problems. The researchers found that most missing arteries were on the left side (73%), and while 26% of the fetuses had congenital anomalies, all complex issues and genetic abnormalities only occurred when the left artery was absent. Interestingly, having just one artery did not lead to more fetuses being smaller than expected. Who this helps: This information benefits doctors and parents of unborn babies with this condition by clarifying the risks associated with which artery is missing.

PubMed

Infrared observations of the neptunian system.

1989

Science (New York, N.Y.)

Conrath B, Flasar FM, Hanel R, Kunde V, Maguire W +11 more

Plain English
This study examined the atmosphere of Neptune using data collected from the Voyager 2 spacecraft. Researchers found that Neptune has a complex temperature structure, with warmer poles and equatorial areas compared to the cooler mid-latitudes. They noted a specific presence of acetylene gas and measured Neptune's average temperature at around 59.3 kelvins, while its moon Triton has a daytime surface temperature of about 38 kelvins. Who this helps: This information benefits astronomers and planetary scientists studying the atmospheres of gas giants.

PubMed

Role of uterine adhesions in the cause of multiple pregnancy losses.

1986

Clinical obstetrics and gynecology

Shaffer W

PubMed

Physiological evaluation of co-pulsation. A new concept for ventricular assist.

1969

Transactions - American Society for Artificial Internal Organs

Sato T, Hogan J, Shaffer W, Holcomb WG, Sato G +1 more

PubMed

New approaches to understanding the alcoholic.

1945

Alcohol hygiene

WOOLLEY LF, SHAFFER W, CRANFORD V

PubMed

New approaches to understanding the alcoholic; the thematic apperception test.

1945

Alcohol hygiene

SHAFFER W

PubMed

Frequent Co-Authors

Kevin J Bozic Deborah Cummins Jayson N Murray Peter Shores Anne Woznica Kaitlyn Sevarino Bradley Spieler David Jevsevar Kevin G Shea Yasseline Martinez

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