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Dive into the research topics where Samer Alsidawi is active.

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Featured researches published by Samer Alsidawi.


The Journal of Clinical Endocrinology and Metabolism | 2017

Expression of PD-1 and PD-L1 in anaplastic thyroid cancer patients treated with multimodal therapy: Results from a retrospective study

Ashish V. Chintakuntlawar; Kandelaria M. Rumilla; Carin Y. Smith; Sarah M. Jenkins; Robert L. Foote; Jan L. Kasperbauer; John C. Morris; Mabel Ryder; Samer Alsidawi; Crystal R. Hilger; Keith C. Bible

Context Anaplastic thyroid cancer (ATC) is rare and a highly fatal malignancy. The role of programmed death-1 (PD-1) and programmed death ligand-1 (PD-L1) as prognostic and/or predictive markers in ATC is unknown. Objective Multimodal therapy offers the best chance at tumor control. The objective of this study was to detect potential associations of PD-1/PD-L1 axis variables with outcome data in ATC. Design Retrospective study of a uniformly treated cohort. Setting Single institution retrospective cohort study. Patients or Other Participants Sixteen patients who received intensity-modulated radiation therapy (15 had preceding surgery) were studied. Main Outcome Measure Patients treated with multimodal therapy were followed and assessed for overall survival (OS) and progression-free survival (PFS). Results All samples demonstrated PD-1 expression in inflammatory cells whereas tumor cells were primarily negative. PD-L1 was expressed on ATC tumor cells in most samples and showed mainly membranous staining. High PD-1 expression (>40% staining) in inflammatory cells was associated with worse overall survival (OS; hazard ratio, 3.36; 95% confidence interval, 1.00 to 12.96; P < 0.05) and trended toward worse PFS, whereas high PD-L1 expression in tumor cells (>33% staining) trended toward worse PFS and OS. Conclusion PD-1/PD-L1 pathway proteins are highly expressed in ATC tumor samples and appear to represent predictive markers of PFS and OS in multimodality-treated ATC patients.


Oral Oncology | 2017

Characteristics and long-term outcomes of head and neck squamous cell carcinoma after solid organ transplantation

Samer Alsidawi; Katharine A. Price; Ashish V. Chintakuntlawar; Gustavo Figueiredo Marcondes Westin; Joaquin J. Garcia; Daniel J. Ma; Scott H. Okuno

INTRODUCTION Immunosuppression after solid organ transplant prevents graft rejection, but leads to increased incidence of various malignancies including head and neck squamous cell carcinoma (HNSCC). Outcomes of patients with post-transplant HNSCC are unknown. MATERIALS AND METHODS We retrospectively identified patients who developed HNSCC after solid organ transplant between 1995 and 2010. Adults with pathology-proven HNSCC and adequate follow up were included. Median overall survival and progression free survival were analyzed using the Kaplan-Meier method. The prognostic effect of variables was studied with Cox proportional hazards models. RESULTS Thirty-three patients met study inclusion criteria. The median time to diagnosis of HNSCC after transplant was 5.9years. The primary site was oral cavity in 15 patients, oropharynx in 10, larynx in 3, hypopharynx in 2, parotid in 2 and unknown in 1 patient. Eighty-eight percent underwent upfront surgical resection. Of those, sixty-six percent received adjuvant therapy. Six percent of patients had definitive chemoradiation. Treatment was well tolerated and did not lead to graft rejection. The 5-year overall survival rate was 45% and 37% for localized and locally advanced disease respectively. Seventy-five percent of patients with oropharyngeal tumors were HPV-positive and they had better outcomes (5-year overall survival rate of 67%). In multivariate analysis, age ≥60years was a negative predictor of survival (HR 2.7; 95% CI, 1.1-6.5; P=0.03). CONCLUSIONS Patients with post-transplant HNSCC have relatively poor survival and high risk of locoregional and distant recurrence. HPV- positive oropharyngeal tumors continue to have better outcomes in this population.


Journal of Clinical Oncology | 2017

Pancreatic neuroendocrine tumors: A population-based analysis of epidemiology and outcomes.

Samer Alsidawi; Gustavo Figueiredo Marcondes Westin; Timothy J. Hobday; Thorvardur R. Halfdanarson


Pancreas | 2018

Survival and Prognostic Factors in Patients With Solid Pseudopapillary Neoplasms of the Pancreas

Brandon M. Huffman; Gustavo Figueiredo Marcondes Westin; Samer Alsidawi; Steven R. Alberts; David M. Nagorney; Thorvardur R. Halfdanarson; Amit Mahipal


Journal of Clinical Oncology | 2017

Impact of adjuvant chemotherapy in non-metastatic node positive bronchial neuroendocrine tumors (BNET).

Gustavo Figueiredo Marcondes Westin; Samer Alsidawi; Konstantinos Leventakos; Thorvardur R. Halfdanarson; Julian R. Molina


Journal of Clinical Oncology | 2017

Characteristics and outcomes of head and neck cancer in solid organ transplant recipients.

Samer Alsidawi; Katharine A. Price; Ashish V. Chintakuntlawar; Joaquin J. Garcia; Gustavo Figueiredo Marcondes Westin; Scott H. Okuno


Journal of Clinical Oncology | 2017

The impact of HPV infection on survival of patients with non-oropharyngeal head and neck cancer.

Samer Alsidawi; Gustavo Figueiredo Marcondes Westin; Ashish V. Chintakuntlawar; Scott H. Okuno; Katharine A. Price


Journal of Clinical Oncology | 2017

Lobectomy with mediastinal nodal dissection versus partial lobectomy in patients with bronchial carcinoid tumors: A NCDB analysis.

Gustavo Figueiredo Marcondes Westin; Samer Alsidawi; Konstantinos Leventakos; Thorvardur R. Halfdanarson; Julian R. Molina


Journal of Clinical Oncology | 2017

Outcomes and predictors of survival in testicular sarcomas.

Samer Alsidawi; Gustavo Figueiredo Marcondes Westin; Scott H. Okuno


Journal of Clinical Oncology | 2017

Outcomes of second line treatment in patients with advanced and metastatic biliary cancers.

Gustavo Figueiredo Marcondes Westin; Samer Alsidawi; Chandrikha Chandrasekharan; Andrew M. Briggler; Brendon Huffman; Angeline Pallante; Joleen M. Hubbard; Steven R. Alberts; Thorvardur R. Halfdanarson

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