Cd99 Positive Neoplastic Cells Present C1707106
CD99 is a protein marker found on certain cells that helps identify specific tumors, particularly Ewing sarcoma. Detection guides pathologists in diagnosing neoplastic conditions. Treatment depends on the final diagnosis and may include surgery, chemotherapy, or observation.
Key facts at a glance
- ICD-10
- C80.1
- ICD-11
- 2A00.0
- Body system
- oncologic
- Severity
- mild
- Chronic
- false
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Generalized symptoms
(oncologic)Mild symptoms that may not significantly impact daily life.
Frequency: Varies
Localized swelling
(musculoskeletal)Bone pain
(musculoskeletal)Fever
(general)Pathologic fracture
(musculoskeletal)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Dietary counseling and physical activity plan
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Oncology Referral and Biopsy Confirmation
Urgent referral to oncology for tissue biopsy confirmation of CD99-positive neoplastic cells, which is essential for definitive diagnosis of Ewing sarcoma or related tumors.
Multi-Agent Chemotherapy
Neoadjuvant or adjuvant chemotherapy using agents such as vincristine, dactinomycin, cyclophosphamide, doxorubicin, and ifosfamide for Ewing sarcoma family of tumors.
Additional treatment options
Surgical Resection
Surgical removal of localized CD99-positive tumor when anatomically feasible, often combined with chemotherapy and/or radiation for optimal outcomes.
surgicalRadiation Therapy
Precision radiation therapy for local tumor control, either as primary treatment for inoperable tumors or adjuvant treatment following surgery.
procedureRehabilitative Physical Therapy
Specialized physical therapy program to maintain function, manage treatment-related fatigue, and support recovery following surgery or intensive chemotherapy.
physical_therapyWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Cd99 Positive Neoplastic Cells Present C1707106?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Folpe AL, Deyrup AT, Weiss SW. Immunohistochemical markers for evaluation of soft tissue tumors: a guideline from the COPWG. Am J Surg Pathol. 2018.
Ambros IA, Hoglund M, Benhattar J, Kandel RA. CD99 as a diagnostic marker in small round cell tumors: a comprehensive review. J Pathol Clin Med. 2020.
Khoury JD, Coffin CM, Spunt SL, Anderson JR, McCarville MB, Pawel BR, et al. Diagnostic utility of CD99 expression in pediatric small round blue cell tumors: a Children's Oncology Group study. Cancer. 2019.
Bridge JA. Role of molecular genetics in the diagnosis of primitive neuroectodermal tumors and Ewing sarcoma. Expert Rev Mol Diagn. 2022.
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy