Ronald A. De Lellis Adjunct Professor of Pathology and Laboratory Medicine, Professor Emeritus of Pathology and Laboratory Medicine

Expertise/Certifications: Anatomic Pathology, Endocrine Pathology
Office number:  444-4483
(Lab Customer Service: 401-793-4242)

Dr. Ronald DeLellis is Professor of Pathology and Laboratory Medicine at Brown University School of Medicine, and Consultant in Pathology and Laboratory Medicine for Lifespan Academic Medical Center. He has been a professor at Brown since 2001 when he relocated to Rhode Island from New York where he was Vice Chairman and Director of Anatomic Pathology at The New York Hospital-Cornell Medical Center and Professor of Pathology at Cornell University Medical College since 1998. Dr. DeLellis received his M.D. degree from Tufts University School of Medicine in Boston and completed his residency training in pathology at the Massachusetts General Hospital and National Cancer Institute. His subspecialty is in the area of endocrine pathology.

Brown Affiliations

Research Areas

scholarly work

Chen X, Hoda SA, DeLellis RA, Seshan SV. Lupus Mastitis. Breast J 2005 Jul-Aug; 11:283-4.

DeLellis, RA. Parathyroid carcinoma. An overview. Adv. Anat Pathol 2005; 12:53-61.

Lloyd, RV, Erickson, LA, Casey, MB, Lem, KY, Lohse, CM, Asa, Sl, Chan, JKC, DeLellis, RA, Harach, HR, Kekudo, K, LiVolsi, VA, Rosai, J, Sebo, TJ, Sobrinho-Simoes, M, Wenig, BM, Lae, ME. Observer variations in the diagnosis of follicular variant of papillary thyroid carcinoma. Am J Surg Pathol 2004; 48: 1336-1340.

Fischer, AH, Young, KA, DeLellis, RA. Incorporating pathologists' criteria of malignancy into the evolutionary model for cancer development. J Cel Biochem 2004; 93 28-36.

Ghannoum, JF, DeLellis, RA, Shin, SJ. Primary carcinoid tumor of the prostate with concurrent adenocarcinoma. Int J Surg Pathol 2004; 12: 167-170.

DeLellis, RA, Xia, L. Paraneoplastic endocrine syndromes: A review. Endocrine Pathol 2003;14:303-317.

DeLellis, RA, Shin, SJ. Immunohistochemical characteristics of adrenocortical carcinoma: An overview. Acta Histochem Cytochem 2003; 36: 293-298.

Khan, A., Tischler, AS, Patwardhan, NA, DeLellis, RA. Calcitonin immunoreactivity in neoplastic and hyperplastic parathyroid glands: an immunohistochemical study . Endocrine Pathol 2003;14:249-256.

Chen. X., DeLellis, RA, Hoda, SA. Adrenoleukodystrophy. Arch Pathol Lab Med 2003; 127:119-20.

Yao, D, Hoda, S, Yin, DY, Kuhel, WI, Harigopal, M, Resetkova, E, Delellis, RA. Interpretative problems and preparative technique influence reliability of intraoperative parathyroid imprint. Arch Pathol Lab Med. 2003; 127: 64-67.

research overview

The research interests of Dr. Ronald DeLellis are in:
• The biology of thyroid cancer;
• Multiple endocrine neoplasia syndromes/clinical and molecular features;
• Immunohistochemical and in situ hybridization methodologies/applications in surgical pathology and cytopathology.

research statement

Research Interests:
• The biology of thyroid cancer;
• Multiple endocrine neoplasia syndromes/clinical and molecular features;
• Immunohistochemical and in situ hybridization methodologies/applications in surgical pathology and cytopathology.

Research/Molecular Pathology Core Facility:
Under my direction and that of the Co-director, Dr. Murray Resnick, the Molecular Pathology Core facility provides state-of-the-art instrumentation and support personnel for the research efforts of the Department of Pathology staff, members of the COBRE Center for Cancer Research Development, and academic community. To date, a total of 32 research groups have made use of our services and facilities, which includes laser capture microdissection, real time PCR, immunohistochemistry, biostatistics, data and image analysis, and a tissue bank that contains both normal and tumor tissue from more than 600 patients.

funded research

1974-1980 Public Health Service Grant, National Cancer Institute, CA 17389
"C-Cell Hyperplasia and Medullary Carcinoma of the Thyroid"
Ronald A. DeLellis, M.D. and Hubert J. Wolfe, M.D. (Co-Principal Investigators)
$750,000 (15% effort)

1980-1986 Public Health Service Grant, National Cancer Institute, CA 12924
"Biology of the Normal and Neoplastic C-Cell"
Ronald A. DeLellis, M.D. and Hubert J. Wolfe, M.D. (Co-Principal Investigators)
$950,000 (15% effort)

1985-1988 Public Health Service Grant, National Cancer Institute, CA 17983
"Clinical Cancer Education Program"
Larry Nathanson, M.D. (Principal Investigator), Ronald A. DeLellis, M.D (Co-Investigator)
$1,500,000 (5% effort)

1981-1983 Public Health Service Contract, NCI-CM-67072
"Classification of Non-Hodgkin's Lymphomas"
Richard Rudders, M.D. (Principal Investigator), Ronald A. DeLellis, M.D. (Co-Investigator)
$350,000, (5% effort)

1983-1986 Public Health Service Contract, CA 30335
"Immunohistochemical Profile and Survival in Breast Carcinoma"
Arthur K. Lee, M.D. (Principal Investigator), Ronald A. DeLellis, M.D., (Co-Investigator)
$400,000 (10% effort)

2002-2007 COBRE Center for Cancer Research Development, Molecular Pathology Core, 5-year grant
Ronald A. DeLellis, M.D., (Principal Investigator of Core)
$675,163 (5% effort)