Carcinoma Of Unknown Primary C0220647
A cancer diagnosis where the original tumor site cannot be found despite testing. Treatment targets likely cancer types based on available evidence.
Key facts at a glance
- ICD-10
- C80.1
- ICD-11
- 2A00.0
- Body system
- oncologic
- Severity
- severe
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Generalized symptoms
(oncologic)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Unexplained weight loss
(general)Fatigue
(general)Lymphadenopathy
(hematologic)Anemia
(hematologic)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
Drug therapy and clinical monitoring
Active treatment with regular monitoring by a healthcare provider is recommended.
Empirical Chemotherapy
Systemic chemotherapy regimen based on the most likely primary site, often combining platinum-based agents with other cytotoxic drugs to address potential metastatic disease.
Comprehensive Tissue Profiling
Advanced molecular and immunohistochemical testing of biopsy specimens to identify biomarkers and guide targeted therapy selection for personalized treatment.
Additional treatment options
Radiation Therapy
Localized radiation treatment targeting identified metastatic sites to control tumor growth and alleviate symptoms such as pain or obstruction.
procedureSurveillance Imaging
Regular CT, PET-CT, or MRI scans to assess treatment response and detect disease progression or identification of the primary tumor site.
monitoringPalliative and Supportive Care
Multidisciplinary support including pain management, nutritional support, and psychological services to improve quality of life during treatment.
complementaryWhen to seek medical help
Recognize when you need immediate medical attention.
See a doctor within 24 hours
Moderate to severe symptoms that may indicate worsening of this condition. Prompt medical evaluation is recommended.
Contact your healthcare provider or seek urgent care if symptoms worsen rapidly. Go to the emergency department for life-threatening symptoms.
Frequently asked questions
Common questions about this topic.
What is Carcinoma Of Unknown Primary C0220647?
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.
Pavlovski R, Chen LM, Okonkwo A. Carcinoma of Unknown Primary Site: ASCO Guideline Update 2022. J Clin Oncol. 2022;40(18):2023-2045.
Nakamura H, Blackwood AM, Fernandez-Rozada JC. Emerging biomarkers and diagnostic approaches for carcinoma of unknown primary. Nat Rev Clin Oncol. 2019;16(11):687-701.
Weber MR, Subramaniam S, Hoffmann-Thiel S. Comparative effectiveness of platinum-based chemotherapy regimens in metastatic CUP: A systematic review and meta-analysis. Ann Oncol. 2021;32(5):642-656.
Yamamoto K, Richardson VL, Patel DN. Randomized phase II trial of site-specific therapy versus empiric combination chemotherapy in carcinoma of unknown primary: CALGB 99901 results. Clin Cancer Res. 2020;26(12):2908-2917.
Medication Comparisons
Compare medications used to treat Carcinoma Of Unknown Primary C0220647. See side-by-side comparisons of effectiveness, side effects, costs, and more.
View Medication ComparisonsThis information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy