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Assessing diagnostic delay in Ewing sarcoma: A single tertiary center analysis

Yordan S Ivanov1, Ivo V Ivanov1, Karina A Atanasova-Ivanova1

  • 1Medical University of Sofia, Sofia, Bulgaria.

Folia Medica
|August 30, 2025
PubMed
Abstract

Introduction:

Ewing sarcoma is a rare and highly aggressive primary malignant bone tumor. Early diagnosis is difficult, especially in the early stages of the disease, which often results in delays in diagnosis.

Keywords:
early diagnosis Ewing diagnosis delay patient outcome sarcoma

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Tumor Progression02:07

Tumor Progression

Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...

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