CPT® Code 81525

1. Indications

The procedure associated with CPT® Code 81525 is indicated for patients diagnosed with Stage II colon cancer. It is specifically performed to assess the risk of cancer recurrence following surgical resection. The gene expression profiling provides valuable information that can guide treatment decisions, particularly regarding the potential benefits of adjunct therapies after surgery.

• Stage II Colon Cancer This procedure is primarily indicated for patients with Stage II colon cancer, where the risk of recurrence needs to be evaluated to inform treatment options.

2. Procedure

The procedure for CPT® Code 81525 involves several critical steps to ensure accurate gene expression profiling. First, a tissue sample is obtained from the patient, which can occur during a colonoscopy or surgical resection. This sample is then preserved using formalin fixation and embedded in paraffin, a standard method for maintaining the integrity of the tissue for subsequent analysis. Once the sample is prepared, the next step involves extracting the RNA from the tissue. This RNA is then subjected to real-time reverse transcription polymerase chain reaction (RT-PCR), a technique that amplifies specific RNA sequences to measure gene expression levels. In this procedure, a total of 12 genes are analyzed: 7 genes that are known to be associated with colon cancer and 5 housekeeping genes that serve as controls. The expression levels of these genes are quantified, and the data is processed using specialized computer software. This software applies an algorithm that generates a recurrence score based on the gene expression data, which reflects the likelihood of cancer recurrence in the patient.

• Tissue Sample Collection A tissue sample is obtained from the patient during a colonoscopy or surgical resection, which serves as the basis for the gene expression analysis.
• Sample Preparation The collected tissue is preserved using formalin fixation and embedded in paraffin to maintain its structural integrity for analysis.
• RNA Extraction RNA is extracted from the prepared tissue sample, which is essential for the subsequent gene expression profiling.
• Real-Time RT-PCR The extracted RNA undergoes real-time reverse transcription polymerase chain reaction (RT-PCR) to amplify specific RNA sequences, allowing for the measurement of gene expression levels.
• Gene Analysis A total of 12 genes are analyzed, including 7 cancer-related genes and 5 housekeeping genes, to assess their expression levels accurately.
• Algorithm Development The results from the gene expression analysis are processed using computer software that applies an algorithm to generate a recurrence score, indicating the risk of cancer recurrence.

3. Post-Procedure

After the gene expression profiling procedure is completed, the results, including the recurrence score, are reported to the healthcare provider. This score is crucial for determining the likelihood of cancer recurrence and can significantly influence the treatment plan for the patient. The healthcare provider may discuss the findings with the patient and consider the need for additional treatments, such as chemotherapy or other adjunct therapies, based on the recurrence risk indicated by the score. Follow-up appointments may be scheduled to monitor the patient's condition and to make any necessary adjustments to the treatment plan based on the results of the gene expression profiling.