Ira J. Bleiweiss, MD

faculty photo
Professor of Pathology and Laboratory Medicine at the Hospital of the University of Pennsylvania
Department: Pathology and Laboratory Medicine

Contact information
Hospital of the University of Pennsylvania
Founders 6
3400 Spruce St.
Philadelphia, PA 19104
Office: 215-662-2569
Fax: 215-615-0463
Education:
BA (Biological Basis of Behavior)
University of Pennsylvania, 1980.
MD
St. George's University School of Medicine, Grenada, West Indies, 1984.
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Selected Publications

Tondi Resta I, Nelson ND, Toorens E, Bleiweiss IJ, Nayak A : Mucinous Cystadenocarcinomas of the Breast Exhibit Heterogeneous Genomic Profile as Triple Negative Breast Cancer, Harbor Alterations in PIK3CA, PTEN, AKT1, and GNAS Genes, and May Not Be Indolent. Int J Surg Pathol April 2025.

Avalos Hernandez SR, Hu T, Dumoff KL, Vickery JM Bleiweiss IJ, Nayak A: Invasive lobular carcinoma with extracellular mucin (ILCEM) presenting at distant metastases and recurrences may exhibit triple negative phenotype. Mod Pathol March 2025 Notes: Poster presented at the United States and Canadian Academy Pathologists Annual Meeting.

Narasimhamurthy M, Le A, Boruah N, Moses R, Kelly G, Bleiweiss I, Maxwell KN, Nayak A.: Clinicopathologic Features of Breast Tumors in Germline TP53 Variant-Associated Li-Fraumeni Syndrome. Am J Surg Pathol 49: 195-205, March 2025.

Nayak A, Demarest K, Bleiweiss IJ, Shah PD: Pathologic response of metaplastic carcinomas to KEYNOTE-522 regimen: correlation with histological subtypes. Mod Pathol March 2025 Notes: Poster presented at the United States and Canadian Academy Pathologists Annual Meeting.

Tondi Resta I, Hu T, Dumoff KL, Avalos Hernandez SR, Vickery JM Bleiweiss IJ, Nayak A: Tubulopapillary carcinomas of the breast: histopathologic features, immunohistochemical staining with p16, p53, and SOX10, and molecular findings. Mod Pathol March 2025 Notes: Poster presented at the United States and Canadian Academy Pathologists Annual Meeting.

Tondi Resta I, Goldbach MM, Tchou JC, Bleiweiss IJ, Nayak A: Pathologic Features and Residual Cancer Burden (RCB) after Neoadjuvant Endocrine Therapy (NET) in Hormone Receptor Positive Breast Cancer (HR+ BC). Mod Pathol March 2024 Notes: Poster presented at the United States and Canadian Academy Pathologists Annual Meeting.

Lennerz JK, Pantanowitz L, Amin MB, et al. : Ensuring remote diagnostics for pathologists: an open letter to the US Congress. Nat Med 12: 2453-2455, December 2022.

Narasimhamurthy M, Good M, Desai H, Le A, Bleiweiss IJ, Maxwell K, Nayak A: Clinico-pathological features of breast tumors associated with Li-Fraumeni Syndrome. Mod Pathology 35: 196-198, March 2022 Notes: Poster presented at the United States and Canadian Academy Pathologists Annual Meeting, Los Angeles, CA, March 2021.

Zhao X, Nayak A, Bleiweiss IJ: Does the status of the tumor bed at surgical margins affect local recurrence and overall prognosis in patients undergoing lumpectomy status post neoadjuvant therapy. Mod Pathology 35: 224-225, March 2022 Notes: Poster presented at the United States and Canadian Academy Pathologists Annual Meeting, Los Angeles, CA, March 2021.

Hawrot K, Shulman LN, Bleiweiss IJ, Wilkie EJ, Jankowitz RC, Laughlin AI: Time to Treatment Initiation for Breast Cancer during the 2020 COVID-19 Pandemic. JCO Oncology Practice 17(9): 534-540, September 2021.

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Last updated: 05/30/2025
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