G. Petur Nielsen

G. Petur Nielsen, MD is a Professor of Pathology at Harvard Medical School and serves as Subspecialty Head, Bone and Soft Tissue Pathology at Massachusetts General Hospital. With a clinical focus on bone and soft tissue tumors, his expertise spans diagnostic pathology, molecular genetics of neoplasms, and ancillary testing applications.

Research interests center on

• Pathology and biology of bone/soft tissue tumors
• Molecular genetics of bone and soft tissue neoplasms
• Chordoma and sarcoma research
• Epithelioid vascular tumor differentiation
• Mesenchymal tumors of the female genital tract

His work includes landmark studies on tumor misdiagnosis rates, immunohistochemical profiling, and genomic analysis of chordomas.

Scientific contributions appear in leading journals like Nature and American Journal of Surgical Pathology, with major emphasis on

• Molecular tumor classification
• Mutational signature analysis
• Translational oncology
• Diagnostic accuracy improvement
• Genomic instability mechanisms