Allison Duncan

Dr. Allison Duncan


Research Focus & Metrics

Academic Career Length

6Years (2021-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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9 May 2023 in Biomedicines
Verified
Journal Article
Open access
PDF file
ADAllison Duncan
Allison Duncan
DNDarryl Nousome
Darryl Nousome
RRRandy Ricks
Randy Ricks
HKHuai-Ching Kuo
Huai-Ching Kuo
LRLakshmi Ravindranath
Lakshmi Ravindranath
IKIndu Kohaar
Indu Kohaar
Growing evidence indicates the involvement of a genetic component in prostate cancer (CaP) susceptibility and clinical severity. Studies have reported the role of germline mutations and single nucleotide polymorphisms (SNPs) of TP53 as possible risk factors for cancer development. In this single institutional retrospective study, we identified common SNPs in the TP53 gene in AA and CA men and performed association analyses for functional TP53 SNPs with the clinico-pathological features of CaP. The SNP genotyping analysis of the final cohort of 308 men (212 AA; 95 CA) identified 74 SNPs in the TP53 region, with a minor allele frequency (MAF) of at least 1%. Two SNPs were non-synonymous in the exonic region of TP53: rs1800371 (Pro47Ser) and rs1042522 (Arg72Pro). The Pro47Ser variant had an MAF of 0.01 in AA but was not detected in CA. Arg72Pro was the most common SNP, with an MAF of 0.50 (0.41 in AA; 0.68 in CA). Arg72Pro was associated with a shorter time to biochemical recurrence (BCR) (p = 0.046; HR = 1.52). The study demonstrated ancestral differences in the allele frequencies of the TP53 Arg72Pro and Pro47Ser SNPs, providing a valuable framework for evaluating CaP disparities among AA and CA men.

3 October 2021 in Cureus
Verified
Journal Article
Open access
ADAllison Duncan
Allison Duncan
NZNicholas Zingas
Nicholas Zingas
AAAnas Ahmed
Anas Ahmed
RSRoger Shih
Roger Shih
Syphilis is a multi-organ system bacterial infection caused by the bacterium Treponema pallidum. Syphilis can advance through four clinical stages: primary, secondary, latent, and tertiary. Once in the tertiary stage, mortality is seen in up to 58% of individuals. Here, we present a case of latent neurosyphilis manifesting after initiation of the immunosuppressive medication secukinumab, a monoclonal antibody that antagonizes interleukin-17A. A 66-year-old male with type II diabetes mellitus, hyperlipidemia, and rheumatoid arthritis presented to the emergency department for a right lower quadrant abdominal cellulitis at the site of his insulin pump. On examination, a non-blanching papular rash on the palms and soles with several scaling papules was discovered. No visible pustules, oral lesions, or perirectal lesions were seen. Neurological examination was noncontributory. His past medical history revealed initiation of secukinumab for the management of rheumatoid arthritis two months prior to presentation. The rash developed six weeks after starting secukinumab. Basic laboratory tests, including a complete blood count, thyroid panel, renal function panel, fasting blood glucose, electrolytes, and C-reactive protein, were within normal limits. A hepatic panel revealed mildly elevated alkaline phosphatase, alanine transaminase, and erythrocyte sedimentation rate Westergren level. Laboratory tests for hepatitis B, hepatitis C, HIV-1, Chlamydia trachomatis, and Neisseria gonorrhoeae all returned negative. A rapid plasma reagin (RPR) titer returned positive at 1:128, and a serum Treponema pallidum Ab returned reactive. Lumbar puncture serologies demonstrated a positive Venereal Disease Research Laboratory (VDRL) test. The patient was diagnosed with latent neurosyphilis and started on intravenous crystalline penicillin G for three weeks. A thorough history, comprehensive physical examination, and basic workup should be performed in any individual prior to immunosuppressive medication initiation. On initial presentation, our patient had an isolated rash on the palms and soles, which is classical for secondary syphilis. The specific manifestations seen in syphilis depend upon the timing, site, and immune status of the individual. Due to its ability to have a variety of presentations, syphilis should always remain on the differential for any physician caring for immunocompromised individuals. Again, initiation of immunosuppressive medications, such as the monoclonal antibody secukinumab, can result in the reactivation of previously dormant infections. As physicians, we must carefully screen our patients prior to initiating immunosuppressive agents to prevent disease reactivation.

17 April 2023 in Preprints.org
Verified
Preprint
Open access
PDF file
ADAllison Duncan
Allison Duncan
DNDarryl Nousome
Darryl Nousome
RRRandy Ricks
Randy Ricks
HKHuai-Ching Kuo
Huai-Ching Kuo
LRLakshmi Ravindranath
Lakshmi Ravindranath
IKIndu Kohaar
Indu Kohaar
Growing evidence indicates the involvement of a genetic component for CaP susceptibility and clinical severity. Somatic mutations of TP53 have been associated with 50% of diverse human cancers. Studies have also reported the role of germ line mutations and single nucleotide poly-morphisms (SNPs) of TP53 as possible risk factors for cancer development. In this single De-partment of Defense institutional retrospective study, we identified common SNPs in the TP53 gene in AA and CA men and performed association analyses for functional TP53 SNPs with clinico-pathological features of CaP. The CPDR Oncoarray database on blood derived genomic DNA from 321 men treated by radical prostatectomy at WRNMMC were used to examine clini-co-pathological associations with TP53 SNPs. The SNP genotyping analysis on the final cohort of 308 patients (212 AA; 95 CA) identified 74 SNPs in the TP53 gene region with a minor allele fre-quency (MAF) of at least 1%. Two SNPs were non-synonymous in the exonic region of TP53: rs1800371 (Pro47Ser) and rs1042522 (Arg72Pro). The Pro47Ser variant, had a minor allele frequency of 0.01 in AA, however, was not detected in CA. Arg72Pro was the most common SNP with a minor allele frequency of 0.50 (0.41 in AA; 0.68 in CA). Additionally, Arg72Pro was associated with time to biochemical recurrence (BCR) after statistical adjustment for patient age at diagnosis, self-reported race, and Gleason score (p= 0.046; HR = 1.52). The present study demonstrated ancestral differences in allele frequencies of TP53 Arg72Pro and Pro47Ser SNPs in AA and CA CaP, providing a valuable framework for the interrogating CaP disparity among AA and CA men.

8 October 2021 in Cureus
Verified
Journal Article
Open access
ADAllison Duncan
Allison Duncan
DDDavid Dixon
David Dixon
Caffeine has the highest use of any psychoactive substance worldwide and is highly appealing to military personnel who are required to work the long, grueling hours necessary to complete a mission. However, published reports of caffeine intoxication in the medical literature are rare. Individuals undergoing military training experience long work hours in a stressful environment. These conditions can make various caffeine supplements enticing. However, most energy drinks contain multiple serving sizes, and supplements are often packaged in large containers, increasing individuals’ risk of caffeine overconsumption and intoxication. Additionally, young adults in stressful environments are the classic demographic in which the first presentation of a psychiatric illness, such as psychotic disorder, occurs. Interestingly, many of the presenting signs and symptoms, including agitation, restlessness, insomnia, tremors, tachycardia, and psychomotor agitation, are the same in both diagnoses. This stresses the importance of differentiating caffeine intoxication from a psychotic disorder. We present a novel case of an active-duty Service member who presented to the emergency room with symptoms concerning the psychotic disorder. After a more detailed history was acquired, caffeine intoxication became more likely and was ultimately treated. We discuss the overlap in presentation and thus difficulty in differentiating caffeine intoxication from a psychotic disorder.