Your ALK Gene Test Results in Lung Adenocarcinoma - Pulmonology

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Genetic Testing Report


Hello, I am diagnosed with stage 3B lung adenocarcinoma with an ALK gene mutation.
I am currently undergoing treatment with Alectinib.
A PET scan showed bright spots in the hilar region of the lungs; the thoracic oncologist indicated that these are old cancer cells, while the external thoracic team suggested they are newly developed cancer cells.
On November 2, I underwent surgery by the thoracic surgeon, and the thoracic oncologist performed ALK gene testing on the hilar region.
Below is my genetic testing report: SNOMED: 28000-B-M81403DX: Lung, hilar region/right lower lobe para-bronchial area, excisional biopsy ----- Adenocarcinoma ALK IHC: Positive.
ADDENDUM: Result of immunohistochemical stain: ALK (Ventana anti-ALK D5F3 IHC assay): Positive.
ALK comments: The tissue submitted for ALK study was fixed in formalin.
The 5μm immunohistochemical study for ALK was performed with Ventana anti-ALK (D5F3) rabbit monoclonal primary antibody, purchased from Ventana Medical Systems, Inc.
(Tucson, AZ, USA).
The detection system used was the OptiView DAB IHC Detection Kit and the OptiView Amplification Kit.
The immunostaining was performed with the BenchMark ULTRA automated slide staining system.
Scoring criteria for determination of ALK expression: # Positive for ALK: presence of strong granular cytoplasmic staining in tumor cells (any percentage of positive tumor cells).
# Negative for ALK: absence of strong granular cytoplasmic staining in tumor cells.
* Certain staining elements should be excluded, including 1) light.
May I ask:
1.
What does this report indicate?
2.
Is it the same ALK gene mutation?
3.
Are the hilar cancer cells old or newly developed?
4.
Is the condition worsening? Is it resistant to treatment?
5.
Should I continue taking Alectinib for future treatment?
6.
Thank you for your response, doctor.

Xiao Ke, 40~49 year old female. Ask Date: 2022/11/16

Dr. Yang Wenda reply Pulmonology


Hello: It should still be the original mutation.
For other questions, I suggest you consult your attending physician!

Reply Date: 2022/11/16

More Info


Understanding your ALK gene test results is crucial for managing your lung adenocarcinoma, especially given your current treatment with a targeted therapy like Alectinib (安立適). Let's break down your questions based on the information provided in your report and general medical knowledge.

1. Report Content: Your report indicates that you have adenocarcinoma in the lung, specifically in the hilar region and the right lower lobe. The ALK IHC (Immunohistochemistry) test was positive, meaning that the tumor cells show strong granular cytoplasmic staining for the ALK protein. This suggests that your cancer has an ALK gene rearrangement, which is a specific mutation that can be targeted by certain therapies, such as Alectinib.

2. Same ALK Gene Mutation?: Yes, the report confirms that you have an ALK gene mutation. The positive result for ALK indicates that the cancer cells are likely driven by this mutation, which is critical for determining the appropriate treatment strategy.

3. Old vs. New Cancer Cells: The distinction between "old" and "new" cancer cells can be complex. The report suggests that the findings in the hilar region may represent either residual disease from your previous cancer or new growth. The interpretation of these findings should be discussed with your oncologist, who can provide insights based on imaging studies and your clinical history.

4. Disease Progression and Resistance: The presence of new cancer cells could indicate disease progression. However, the fact that you are on targeted therapy (Alectinib) is a positive factor, as this treatment is designed to specifically target and inhibit the growth of ALK-positive cancer cells. Resistance can develop over time, but ongoing monitoring and adjustments in therapy can help manage this.

5. Future Treatment with Alectinib: Continuing Alectinib is generally recommended for patients with ALK-positive lung adenocarcinoma, as it has been shown to improve outcomes. However, your oncologist will consider your overall health, response to treatment, and any new findings from imaging or biopsies when making treatment decisions. Regular follow-up and monitoring are essential to assess the effectiveness of the therapy and make necessary adjustments.

6. Thank You for Your Questions: It’s important to maintain open communication with your healthcare team. They can provide personalized advice based on your specific situation, including the interpretation of imaging results and the implications for your treatment plan.

In summary, your ALK-positive status is significant for your treatment, and Alectinib is a suitable choice. The presence of new cancer cells should be closely monitored, and your oncologist will guide you through the next steps based on your ongoing response to treatment. Regular follow-ups and imaging will be crucial in managing your condition effectively. Always feel free to ask your healthcare provider any questions or concerns you may have regarding your treatment and prognosis.

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