Search results for “uncommon

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21 articles
Body Fluids Open Access

An Uncommon Complication of Multiple Myeloma in a Post Bone Marrow Transplant patient–Plasma Cell Pleocytosis

Jan 2022
PrachiCorresponding author Senior Resident, Department of Pathology, Dharamshila Narayana Super speciality Hospital, New Delhi

This case report describes plasma cell pleocytosis occurring after bone marrow transplantation for multiple myeloma. The authors outline clinical presentation, cerebrospinal fluid findings, and differential diagnosis, emphasizing the need to consider hematologic relapse or CNS involvement in post‑transplant patients with neurologic symptoms. Management considerations and follow‑up strategies are discussed.

Non-Hodgkin Lymphoma of External Auditory Canal – Uncommon Location and Related Risk Factors

Feb 2018 DOI 10.14302/issn.2641-5518.jcci-17-1880
A D Mettias BassemCorresponding author ENT Department, Fayoum University, Egypt.

Objective: Presentation of rare case report of primary non-Hodgkin Lymphoma of temporal bone secondary to immunodeficiency after prolonged steroid administration in a diabetic patient. Then review the literature of similar case reports. Method: 49 years old female presented with hearing loss, facial paralysis and otalgia. Biopsy revealed high grade non Hodgkin’s B-lymphoma. She underwent chemotherapy and had remarkable response. Result: Rapidly progressive deafness, facial paralysis and otalgia are common presentations of external canal Non-Hodgkin lymphoma. The disease is common in middle age, females and has a fair response to chemotherapy, good to radiotherapy. Surgery is an alternative method in isolated lesions or recurrent cases. Conclusion: High dose steroid and type II diabetes are potential risks for acquired immunodeficiency. External Auditory canal lymphoma is uncommon sequel. Chemotherapy is very effective in treatment of isolated cases without B symptoms

Ophthalmic Science Open Access

Herpes Zoster Ophthalmicus Presenting with Suspected Orbital Myositis Following Recent Recombinant Zoster Vaccination

Jul 2026 DOI 10.14302/issn.2470-0436.jos-26-6357
Awan MuhammadCorresponding author

Herpes zoster ophthalmicus (HZO) is a manifestation of varicella-zoster virus (VZV) reactivation involving the ophthalmic division of the trigeminal nerve, carrying significant risk of vision-threatening complications. Diplopia in HZO is often attributed to cranial nerve palsy, although orbital myositis remains a rare and underrecognized cause. We present a 79-year-old male who developed right-sided headache, binocular diplopia, and a V1 vesicular rash two weeks after receiving the recombinant zoster vaccine. Examination revealed restriction of extraocular movements without a localizing cranial nerve pattern, raising suspicion for orbital myositis. Neuroimaging was unremarkable, and VZV polymerase chain reaction confirmed the diagnosis of HZO. The patient received antiviral therapy and was discharged in stable condition after three days. This case highlights HZO presenting with suspected orbital myositis in temporal association with vaccination and underscores the need for vigilance for uncommon neuro-ophthalmic manifestations, as early recognition and treatment are essential to prevent vision-threatening complications. Given the patient's advanced age, this case also emphasizes the possibility that age-related immunosenescence may contribute to VZV reactivation and the development of HZO-related ocular complications. Potential therapeutic approaches targeting age-related immune dysfunction are also considered.

Efficacy and Safety of Lercanidipine Combination in Hypertensive Patients

Dec 2025 DOI 10.14302/issn.2329-9487.jhc-25-5778
S Kallistratos ManolisCorresponding author

Calcium channel blockers (CCBs) are widely used for the treatment of arterial hypertension, but they differ in terms of pharmacology, tolerability, and pleiotropic actions. Lercanidipine, a highly lipophilic third generation dihydropyridine, reduces blood pressure (BP) effectively as monotherapy and in combination without inferiority to other major antihypertensive classes. We systematically searched PubMed and the Cochrane Library (last update: September 1, 2025) and screened reference lists for additional studies. Evidence from dose finding trials, randomized controlled studies, large observational cohorts, and meta analyses shows clinically meaningful reductions in office, home, and ambulatory BP with lercanidipine, including in patients with diabetes, obesity, chronic kidney disease, or high cardiovascular (CV) risk. Fixed- dose combinations with renin angiotensin system blockers (e.g., enalapril) provide greater BP reductions than monotherapy and are associated with favorable neurometabolic profiles. Beyond BP control, lercanidipine improves central hemodynamics and arterial stiffness, favors endothelial biology, and contributes to left ventricular hypertrophy regression. Across comparative trials, lercanidipine is generally better tolerated than older dihydropyridines. Presents lower rates of vasodilatory adverse events, less sympathetic activation, while discontinuations due to adverse events are uncommon. Overall, lercanidipine particularly within single pill combinations offers effective, durable BP lowering across diverse patient profiles with a favorable safety and tolerability profile and pleiotropic benefits that extend beyond BP reduction. Figure 1. Graphical Abstract: Pleiotropic effects of Lercanidipine

Iatrogenic Extra-Capsular Extension of Knee Septic Arthritis Via Intra-Articular Joint Injection

May 2025 DOI 10.14302/issn.2694-2283.jsem-25-5529
Al-saeed NawafCorresponding author

Background Septic arthritis is a potentially limb or life-threatening joint infection that requires prompt recognition and intervention to reduce morbidity and mortality. While intra-articular joint injections are commonly performed for osteoarthritis and other arthropathies, they carry a rare but significant risk of iatrogenic infection, particularly when performed in the presence of unrecognized joint or periarticular infection. Case Presentation We report a case of a 52-year-old female with a history of traumatic brain injury and chronic right knee pain who developed severe knee swelling, pain, and systemic symptoms following an intra-articular corticosteroid injection performed without ultrasound evaluation/guidance. Post-procedure, she presented with fever, elevated inflammatory markers, and purulent knee effusion. Operative washout revealed a purulent tract extending from the knee joint capsule to the lateral thigh. Cultures from joint aspiration and intraoperative samples grew Streptococcus dysgalactiae. Blood cultures were negative. The patient reported frequent cat scratches to the affected knee and described an unusual sensation of the injection needle tracking laterally during the joint injection. She was treated with surgical drainage and a four-week course of amoxicillin, with full clinical recovery. Discussion This case highlights an unusual presentation of septic arthritis with extra-capsular extension likely due to iatrogenic needle tracking during joint injection. The causative organism, S. dysgalactiae, is an uncommon pathogen in septic arthritis, and the presumed source was contiguous spread from untreated cellulitis, possibly related to cat scratches/bites. The absence of predisposing comorbidities and negative blood cultures further support a local rather than hematogenous source. The case emphasizes the importance of thorough clinical evaluation and consideration of infection prior to joint injections, as well as the potential benefits of ultrasound guidance to minimize procedural complications. Conclusion Careful history, physical examination, and appropriate imaging are essential prior to joint interventions to avoid iatrogenic complications. This case illustrates the rare but serious risk of extra-capsular extension of septic arthritis following intra-articular injection and emphasizes the need for vigilance in identifying underlying infection before proceeding with invasive procedures.

Internal Jugular Phlebectasia; A Challenging Neck Mass in Children

Oct 2024 DOI 10.14302/issn.2691-5014.jphn-24-5310
Alsaeed GihadCorresponding author

Cystic neck masses are uncommon in children, and a minority of them are soft. Internal jugular vein phlebectasia (IJVP) is a rare cause of soft neck cysts. It presents usually as a unilateral soft neck mass of changing size. In most cases it is unilateral, right sided and predominantly in males. Imaging study modalities are diagnostic and helpful for observation and follow up. In the vast majority of cases, it decreases in size with time requiring only conservative treatment. However, surgery might be necessary in large or complicated phlebectasia. IJVP is underdiagnosed or misdiagnosed especially in pediatrics, with few cases documented in medical literature. To improve awareness of presentation and management-plan of this rare case, the authors present an extremely rare case of huge left internal jugular phlebectasia in a 14 year-old boy worsened and complicated over years of wait and see approach that needed surgical treatment.

Diseases Open Access

Late Onset Meningitis in Post Traumatic Temporal Meningoencephalocele

May 2022 DOI 10.14302/issn.2997-1977.jd-22-4183
Noorbakhsh SamilehCorresponding author Professor of Pediatric Infectious Disease, pediatric infectious diseases Departement, Iran University of Medical Sciences. Tehran, Iran.

Temporal lobe meningoencephalocele is an uncommon anomaly in the face. As brain tissue herniate through the dural imperfection, cerebrospinal fluid (CSF) or a mass will appear in the mastoid, middle ear or the both. Here we present a 10 years old boy with right lobe temporal meningoencephalocele which results in CSF leakage and manifested with bacterial meningitis. He had a history of head trauma and bone fracture 3 years ago. In surgery the defect repaired and the patient showed improvement.

Extraosseous Plasmacytoma of Thyroid Arising in Hashimoto’s Thyroiditis

Sep 2020 DOI 10.14302/issn.2372-6601.jhor-20-3552
Qing XinCorresponding author Department of Pathology, Harbor-UCLA Medical Center, 1000 West Carson Street, Torrance, CA 90502, USA

Plasma cell neoplasms of the thyroid gland are uncommon. They may occur either as a primary extraosseous (extramedullary) plasmacytoma or as secondary involvement by multiple myeloma (MM). Here, we report the case of a 62-year-old female, presenting with goiter and Hashimoto’s thyroiditis, in whom the histologic diagnosis of extraosseous plasmacytoma was unexpected. Histology of the total thyroidectomy specimen showed a diffuse infiltration of well-differentiated plasma cells against a background of Hashimoto’s thyroiditis. By immunohistochemistry, the majority of the plasma cells are positive for IgG heavy chain and kappa light chain (kappa:lambda ratio was about 6-7:1). PCR analysis of the immunoglobulin heavy and kappa chain (IGH, IGK) gene rearrangements showed clonal IGH and IGK gene rearrangements. MM was ruled out by lack of MM-related end organ damage and negative serum protein electrophoresis, immunofixation, and bone marrow biopsy. Although rare, plasmacytoma should be considered in patients presenting with enlarging thyroid gland and autoimmune thyroiditis. Histologic diagnosis and differential diagnoses are comprehensively discussed.

Identity Crisis - Common Tumors in Exceptional Locations, A Case Series

May 2020 DOI 10.14302/issn.2641-4538.jphi-20-3289
Rajendran ThilagaCorresponding author Department of Otorhinolaryngology, Hospital Sultanah Aminah (Ministry of Health, Malaysia), Johor, Malaysia

Mucoepidermoid carcinoma (MEC) accounts for only 5% of all salivary gland tumors and is most often seen in the parotid glands. MEC occurrence in the larynx is, however, rare. The incidence of primary squamous cell carcinoma (SCC) of salivary glands is also scarce and comprises only about 1.6% of all salivary gland malignancies. Hereby, we share our experience in managing two patients with rare and opposite variants of malignancy which were diagnosed at the same time; MEC of the larynx and SCC of the parotid. In MEC tumors, the presence of the intermediate and mucous cells with positivity in mucicarmine stain are the significant features. For SCC tumors, identification of the usual tumor markers (p40, CK 5/6 and p63) are pathognomonic. Although MEC and SCC are common in the head and neck regions, the existence of these malignancies in exceptional locations must be considered. The key features mentioned in our comparison table can help distinguish both these tumors and to deliver the correct treatment modalities. The prevalence of genomic and carcinogenic factors in the occurrence of these tumors in uncommon locations needs to be explored in future studies.

Acute Peritonitis: A Rare Complication Revealing Intestinal Tuberculosis

Sep 2019 DOI 10.14302/issn.2578-2371.jslr-19-3028
Sabbah.MCorresponding author Gastroenterology Department, Habib Thameur Hospital Tunis

Intestinal tuberculosis diagnosis is often difficult because of non-specific symptoms, miming many other conditions such as malignancy, infectious disease, and inflammatory bowel disease. Free intestinal perforation is an uncommon but life-threatening complication of intestinal tuberculosis, associated with high morbidity and mortality.

Ophthalmic Science Open Access

A Case Report of Inverting Papilloma of Lacrimal Sac

Sep 2019 DOI 10.14302/issn.2470-0436.jos-19-2998
Marie Y. Omana ElaineCorresponding author Department of Ophthalmology, Rizal Medical Center, Pasig City, Philippines

Purpose To report a rare case of Inverting Papilloma originating from the Lacrimal Sac in Tertiary Hospital. Method Case report. Results Inverting papilloma is uncommon in lacrimal sac. More often presents in Maxillary sinus, Ethmoid sinus and lateral wall of nasal cavity. This case of 69 years old, Filipino male, who presented with a two-year history of gradually enlarging left medial canthal mass, and tearing. There were no ophthalmoplegia, visual disturbances, proptosis or pain but there was globe displacement superolaterally. Other ophthalmologic examinations were unremarkable at that time of examination. Orbital CT-scan revealed: Heterogenously enhancing mass extending to ipsilateral nasolacrimal canal and nasal cavity causing mass effect. There was note of a suspicious area of hyperostosis. Patient was referred to the Department of Otolaryngology Head and Neck Surgery for co-management. Punch biopsy was done and histopathology revealed Inverting papilloma. Combined surgical management of anterior Maxillectomy via lateral Rhinotomy approach and Dacryocystectomy was done. Intraoperatively, there was note of adhesions to bone in the area of the Lacrimal Sac corresponding to the area of hyperostosis on CT-scan. Post-operative recovery was unremarkable with unchanged visual acuity and extraocular muscle movement. Conclusions This is a case of an inverting papilloma involving the lacrimal sac and nasolacrimal duct that was managed with combined anterior maxillectomy via Lateral Rhinotomy approach and dacryocystectomy for complete resection. We recommended complete resection of the tumor to minimize recurrence. Origin in the Lacrimal Sac area was confirmed by intraoperative findings which correlated with CT- scan findings.

Hip Angle Behavior in Landing After Drop Jump in Children; and their Implicance in Prevention Programs

Jul 2019 DOI 10.14302/issn.2694-2283.jsem-19-2949
Hinzpeter JaimeCorresponding author Department of Orthopaedic Surgery, Clinical Hospital, University of Chile, Santos Dumontt # 999, Independencia, Zip Code: 8380456, Santiago, Chile.

Background The Anterior Cruciate Ligament (ACL) injury is uncommon, but constitutes an important percentage of the lesions requiring more than 8 weeks of recovery in sports. Most ACL injuries do not require external contact and are associated with biomechanical risk factors that stress this ligament ACL: like an increase in knee valgus angle (KV) and hip flexion (HF) and a decreased in knee flexion (KF). The ACL requires muscle cooperation to resist the load; however, when there is fatigue, the protective capacity of the musculature would decrease. The objective of the study is to analyze the angular behavior before and after a physical load for HF in children of 14-15 years old. Hypothesis The physical load applied in a single training session is enough to change some biomechanical risk factors of ACL injury. Study Design Experimental study Level of Evidence 2b Methods The sample consisted of 50 students from different soccer schools between 14-15 years old. We analyzed the hip angular behavior of hip flexion before and after a training session. The angles where obtained from inertioal sensor while the students performed a Drop Jump test from a 30 centimeters drawer. Results Statistically significant differences were found in the differences between pre physical load HF / post-load HF (p = 0.00053), right pre physical load HF / right post- load HF (p = 0.0086) and left post- load (p = 0.0248206). Conclusions It was concluded that the angular behavior of HF increases significantly in both post-training limbs, after performing a physical load. Clinical Relevance This study analyzed the importance of using prevention injury programs since early stages, and give importance to the eccentric role of hamstring, gluteus and core exercises.

Prevalence of Non-Fistulous Urinary Incontinence among Nonparturient Women in A Tertiary Hospital

May 2018 DOI 10.14302/issn.2381-862X.jwrh-18-2074
Olukemi Bello OluwasomidoyinCorresponding author Department of Obstetrics and Gynaecology, University College Hospital.

Objective: To determine the prevalence and risk factors of non-fistulous urinary incontinence (UI) among non-parturient women at University College Hospital, Ibadan, Nigeria. Methods: A hospital based cross sectional study of 500 non-parturient women presenting with non- fistulous gynaecological symptoms at the University College Hospital, Ibadan. An interviewer administered questionnaire was used to obtain information. Data were analyzed using SPSS version 20. Data analysis involved descriptive statistics, bivariate and multivariate analysis to determine the risk factors of urinary incontinence. Results: Mean age was 36.61 (SD=10.1) years and almost all (83.2%) were married. Prevalence of urinary incontinence is 21.4%. Majority (40.6%) had symptoms of stress urinary incontinence and 8.0% had urge urinary incontinence. Only 19.6% of those who leaked urine in the last one month sought medical attention despite visiting the hospital for other ailment(s), while of those that had ever leaked urine, 13.1% of them ever sought medical attention. Risk factors for UI were age at first delivery (OR=21.21, 95%CI=2.179-206.478), marital status (OR=0.142, 95%CI=0.044-0.454), chronic illness (OR=3.987, 95%CI=2.147-7.405) and history of prolonged labour (OR=3.111, 95%CI=1.584-6.110). Conclusion: UI is not uncommon in Nigeria. The identified predisposing factors were low age at first delivery, history of prolonged labour and chronic illness. There is need to sensitize women of the symptoms and complications associated with urinary incontinence as well as its prevention and need to seek medical care if they have the symptoms.

Neoplasms Open Access

Rare Lipomatous Neoplasm of The Thigh in A 13 Year Old Male with A Discussion of Imaging Features and Differential Diagnosis of A Fatty Extremity Mass

Feb 2018 DOI 10.14302/issn.2639-1716.jn-18-1965
T. Caracciolo JamieCorresponding author Department of Diagnostic Imaging, Moffitt Cancer Center, Tampa, FL

Lipomatous tumors are among the most common primary musculoskeletal neoplasms affecting both pediatric and adult patient populations. Patient age, tumor location, and imaging features all contribute to the differential diagnosis of musculoskeletal tumors. Tumors identified outside of common patient demographics or in unusual locations may lead to preoperative misdiagnosis. We present an uncommon adipocytic tumor occurring at an uncommon age which was proven at surgery to represent a preoperatively unexpected diagnosis. A 13 year old male presented with a fatty anterior proximal thigh mass; age and magnetic resonance findings suggested lipoblastoma. However, following complete surgical resection, histopathology confirmed hibernoma, a benign lipomatous tumor characterized by the presence of white and multivacuolated brown fat cells, the vast majority of which occur in adult patients.

Severe Ischemic Stroke due to Progression of Cervical Carotid Artery Dissection

Sep 2017 DOI 10.14302/issn.2470-5020.jnrt-17-1733
Inoue NobuhiroCorresponding author Division of Neurosurgery Kumamoto Neurosurgical Hospital

Spontaneous dissection of the cervical segment of the internal carotid artery (CS-ICA) is uncommon but not rare. A 43-year-old man suddenly developed complete right hemiparesis with motor aphasia. 3 weeks after the initial symptom onset. Magnetic resonance imaging showed enlargement of an intramural hematoma at the cervical carotid artery; it severely compressed and completely occluded the arterial lumen. Diffuse ischemia was observed in the area of the left middle cerebral artery (MCA) immediately after onset and he underwent emergency left superficial temporal artery-MCA double bypass within 6 hours. There was no fatal deterioration and his neurological deficit was resolved. We discuss our treatment of spontaneous dissection of the CS-ICA to prevent ischemic damage.

Veterinary Healthcare Open Access

Canine Periosteal Osteosarcoma

Aug 2017 DOI 10.14302/issn.2575-1212.jvhc-17-1574
Noronha de Toledo GabrielaCorresponding author Department of Clinic and Veterinary Surgery, School of Agricultural and Veterinary Sciences (FCAV), Universidade Estadual Paulista – UNESP, Campus Jaboticabal, SP, Brazil.

Periosteal osteosarcoma is an uncommon primary malignant bone tumor in dogs and humans. This type of tumor is one of the four variants of osteosarcoma. The main feature is a superficial lesion without evidence of bone marrow involvement. The treatment usually performed is limb amputation. There is insufficient data on long-term disease-free time, surgical resection or local recurrence in dogs. The present review aims to gather information on periosteal osteosarcoma in dogs

Non-Syndromic Multiple Keratocystic Odontogenic Tumor: A Case Report

Aug 2017 DOI 10.14302/issn.2379-8572.joa-17-1668
Seifi SafouraCorresponding author Associate Professor of Oral and Maxillofacial Pathology, Oral Health Research Center, School of Dentistry, Babol University of Medical Sciences, Babol, Iran;

A Keratocystic Odontogenic Tumor (KCOT) is a benign odontogenic lesion that is well-known for its histopathological features and invasive clinical behaviors. KCOTs may be non-syndromic or syndromic, and the syndromic type presents a higher risk of recurrence and invasive behaviors. Non-syndromic KCOTs are uncommon and account for only 5% of the cases. The purpose of the present case report is to conduct clinical, radiographic and pathologic evaluations and treat a 37-year-old man with non-syndromic nevoid basal cell carcinoma. Syndromic and non-syndromic keratocysts present more invasive behaviors than the solitary type. The initial symptoms of syndromic keratocysts appear as multiple keratocysts of the mandible and maxilla that are diagnosed by a dentist; as a result, the diagnosis and treatment of the disease is very crucial.

“On the Road to A Better Life”: An Innovative Suicide Prevention Program Based on The Realization of Meaningful Personal Goals

Jan 2017 DOI 10.14302/issn.2476-1710.jdt-16-1306
Lapierre SylvieCorresponding author Department of Psychology, Université du Québec à Trois-Rivières.University of Montreal.

Background. Suicide prevention programs centred on reinforcing protective factors are uncommon. Aims. Since leading a meaningful life is incompatible with suicide, a 14-week program designed to help participants realize meaningful personal goals was created to improve the psychological well-being (PWB) of depressed older adults (≥ 65 years). Method. Persons scoring 9 or above on the Beck Depression Inventory- II (M = 22.05) took part in the program (n = 24). Their levels of PWB, depression, and suicidal thoughts were compared to those of a control group (n = 18). The questionnaires were completed three times: pre-test, post-test, and follow-up (six months later). Results. Analyses showed that the program participants improved significantly on most indicators of wellbeing, including suicidal ideation, indicating that increasing protective factors could be an innovative way to prevent suicidal ideation. However, the changes were not significantly higher than those observed in the control group, except for meaning in life. Conclusions. The absence of difference between groups was partly justified by unexplained improvements of controls between post-test and follow-up. Future studies should develop suicide prevention program thatincrease protective factors that provide individuals with means to achieve an optimal state of functioning.

RETRACTED: Fibrous Dysplasia of the Thyroid Cartilage – A Case Study and Review of the Literature

Jun 2015 DOI 10.14302/issn.2379-8572.joa-14-548
Pang AaronCorresponding author

This article has been retracted on 25 March 2016. VIEW THE RETRACTION NOTICE (https://doi.org/10.14302/issn.2379-8572.joa-25-5867) Fibrous dysplasia is a rare disorder of bone that is uncommon in the head and neck region. Herein, we present a rare case of polyostotic fibrous dysplasia involving the right temporal bone and thyroid cartilage in a 19-year-old male. This unique location necessitates close surveillance due to the proximity to the airway and the potential for malignant degeneration.

Pleomorphic Adenoma of The Nasal Septum

Nov 2014 DOI 10.14302/issn.2379-8572.joa-14-561
Elwany samyCorresponding author Department of Otolaryngology, Alexandria medical School, Alexandria, Egypt

Pleomorphic adenomas are uncommon tumors of the nasal cavity. They arise from minor salivary glands, and usually originate from the nasal septum. The tumors are more common in middle-aged females. We present a series of 8 cases of intranasal pleomorphic adenomas. Seven of these tumors originated from the nasal septum, and only one of them originated from the lateral nasal wall. Histopathologic examination of the tumors showed that these tumors have higher epithelial and lower stromal components compared to pleomorphic adenomas of major salivary glands. Endoscopic resection was performed in all cases and the patients were followed up for one year. No recurrences or complications were observed in this series. Endoscopic resection is recommended as the treatment of choice because of its proven efficacy and low morbidity.

Correlation of Oncotype DX Recurrence Score with the Expression of Insulin Receptor Substrate Proteins in Estrogen Receptor + Breast Cancer

May 2014 DOI 10.14302/issn.2572-3030.jcgb-13-369
Khan AshrafCorresponding author Departments of Pathology, UMass Memorial Medical Center, University of Massachusetts Medical School, Worcester, MA 01605, USA

Insulin receptor substrate (IRS) 1 and 2 are downstream signaling proteins that influence breast pathophysiology. IRS-1 promotes carcinoma cell proliferation; whereas IRS-2 regulates cell motility, invasion, and glycolysis. Our lab has shown that distinct cellular localization of IRS-2 also plays a role in carcinoma cell function. Oncotype DX (Genomic Health) (ODX) is a 21-gene expression profile used to classify carcinomas with low, intermediate, and high risk recurrence scores (RS). Our aim is to correlate expression and cellular localization of IRS proteins in breast carcinomas with their ODX RS. 97 breast carcinomas sent for ODX testing from 2006-2009 were collected and grouped according to their RS (low, intermediate or high). Immunohistochemistry for IRS-1/-2 was performed. Specific criteria were used to evaluate IRS staining patterns. Follow-up data, ranging from 3-6 years, was available. Statistical analysis was performed to correlate staining patterns of IRS-1/-2 with the three RS groups. IRS-1 staining, predominantly nuclear, did not significantly correlate with RS (P=.5645). IRS-2 expression patterns did show statistical significance amongst the three RS groups (P=.0371). Tumors with intermediate and low RS were more likely to exhibit punctate and diffuse cytoplasmic expression of IRS-2, and cell membrane expression was uncommon in this group. Expression and cellular localization of IRS proteins play an important role in breast cancer cell biology, and expression patterns for IRS-2 do demonstrate a significant correlation with ODX RS. Further studies are required to elucidate the significance of cellular localization of IRS-1/-2 proteins in breast carcinoma cells and their relationship to ODX scores.

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