Does a squamous cell carcinoma antigen (SCC) level of 1.9 require a PET-CT scan?

PET-CT refers to positron emission tomography-computed tomography, whose English name is PET-CT. SCC antigen 1.9 refers to a squamous cell carcinoma (SCC) antigen level of 1.9 μg/L. SCC antigen is merely a tumor marker. If the SCC antigen level is solely 1.9 μg/L without any other symptoms or discomfort, there is no need for a PET-CT scan. However, if other abnormalities or lesions are present, a PET-CT may be necessary.

1. Not necessary

Firstly, due to differences in testing methods and technologies, the normal upper limits and reference ranges for SCC antigen levels can vary significantly between hospitals. It is recommended to undergo repeated testing at the same hospital to compare changes and fluctuations in the antigen levels over time. Secondly, if multiple tests conducted at the same hospital show fluctuating values, the elevated SCC antigen may be associated with benign conditions such as pneumonia or dermatitis. In such cases, PET-CT is not required; treatment should instead focus on managing the underlying benign condition as directed by a physician.

2. Necessary

If the SCC antigen level continues to rise, it becomes essential to evaluate the patient's clinical symptoms along with imaging results such as PET-CT and MRI to determine whether malignant diseases such as esophageal cancer, lung cancer, or skin cancer are present. In these situations, a PET-CT scan is warranted.

Patients with abnormal SCC antigen levels are advised to seek timely medical evaluation, obtain a definitive diagnosis, and initiate appropriate treatment promptly to avoid disease progression.