Tissue biopsies are tests in which small amounts of tissue are removed for examination to find out if a person has lung cancer and, if so, which type of lung cancer.
Currently, tissue biopsies are the only way to confirm a diagnosis of lung cancer.
There are many different ways doctors can obtain tissue. Depending on which method is used, the doctor can also determine whether the cancer has spread to lymph nodes or other organs. The tissue that is removed is sent to a pathologist, who examines it and then issues a The description of cells and tissues made by a pathologist based on what is seen under a microscope with his or her findings.
Having enough tissue available for Analyzing DNA to look for a genetic alteration that may indicate an increased risk for developing a specific disease or disorder can also be an important consideration. Before a biopsy is done, the patient should speak with his or her doctor about having the tumor sample profiled. Read more about biomarker testing in the Targeted Therapy section.
During a bronchoscopy, a surgeon or a doctor who specializes in lung disease inserts a bronchoscope (a thin, flexible tube) into the patient’s mouth or nose, down the The airway that leads from the larynx (voice box) to the bronchi (large airways that lead to the lungs). Also called windpipe, and into the lungs. A light and a camera at the end of the tube allow the doctor to look for abnormal areas. Tiny tools can be passed down through the bronchoscope to take samples of tissue, which are checked under a microscope for signs of cancer.1,2,3
Prior to a bronchoscopy, a numbing medicine is sprayed in the mouth and throat. Sometimes a patient may also be given A state of calmness, relaxation, or sleepiness caused by certain drugs through an Into or within a vein line to prevent pain or to help the patient relax.1,2,3
Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA)
Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) may be used to access mediastinal lymph nodes. A flexible bronchoscope fitted with an ultrasound device is guided down the trachea. Once the bronchoscope is in place, a needle is inserted through the bronchus and into a lymph node to obtain a sample. EBUS-TBNA requires local anesthesia.4,5
Transthoracic needle biopsy
If a suspicious mass is in the The outermost part or region of the lungs, a needle can be passed though the chest wall with CT or A procedure that uses high-energy sound waves to look at tissues and organs inside the body guidance to biopsy tissue or remove suspicious fluid. When a small needle is inserted through the skin of the chest wall, it is called a The removal of tissue or fluid with a thin needle for examination under a microscope, usually to determine if cancer is present or what the cancer cell type is. If a larger sample is needed, a The removal of a tissue sample with a wide needle for examination under a microscope is done with a larger needle.1,5,6
For a transthoracic needle biopsy, an A medical doctor who is specially trained to use minimally invasive image-guided procedures to diagnose and treat diseases, with the goal of minimizing risk to the patient and improving health outcomes inserts a needle through the chest wall. A chest CT scan or a special X-ray machine called a An instrument equipped with a fluorescent screen on which the internal structures of the human body may be continuously viewed by means of X-ray is used to help the doctor guide the needle toward the suspicious area. A sample of the mass is then aspirated, or sucked out, and sent to the lab to check for cancer cells.1,5,6
Advantages of this type of biopsy are that it requires only a very small nick on the skin, and usually local numbing medicine is all a patient needs. Disadvantages of a transthoracic needle biopsy are that sometimes it can miss small nodules or might not provide enough of a sample to make a diagnosis and perform Analyzing DNA to look for a genetic alteration that may indicate an increased risk for developing a specific disease or disorder. Note: A core biopsy is usually preferred for biomarker testing.6,7,8
There is also a risk that air may leak out of the lung at the biopsy site and into the space between the lung and the chest wall. This complication, called a An abnormal collection of air or gas in the space between the lung and the chest wall, can lead to trouble breathing and may cause part of the lung to collapse. A chest tube can be inserted to treat the pneumothorax, or the air may be sucked out of the space with a needle.1,6
If a patient has a fluid around the lungs, doctors can perform a thoracentesis to see if it was caused by cancer that spread to the linings of the lungs. In this procedure, a doctor numbs the skin and then inserts a hollow needle between the ribs to drain the fluid. The fluid is sent to a laboratory to be checked for cancer cells.1,5,9
A thoracoscopy is a surgical procedure performed in the operating room under general anesthesia. A surgeon makes a small incision in the skin of the chest wall and inserts a special instrument with a small video camera on the end to examine the lungs and inside of the chest. Samples of tissue are removed for a pathologist to look at under the microscope. This procedure is also referred to as VATS (video-assisted thoracoscopic surgery).
A thoracoscopy can be used for multiple reasons:
- To sample An abnormal mass of tissue that results when cells divide more than they should or do not die when they should and lymph nodes on the outer parts of the lungs
- To see if lung cancer has spread to the spaces between the lungs and the chest wall
- To check if the tumor has spread to nearby lymph nodes and organs
- As part of the treatment to remove part of a lung in some early-stage lung cancers
Because it is more invasive and requires general anesthesia, a thoracoscopy is not usually the first procedure done to get tissue to diagnose lung cancer if a less invasive procedure can be done. It is sometimes used for diagnosis if tests such as transthoracic needle biopsies are unsuccessful in getting enough tissue for the diagnosis. However, a thoracoscopy is performed more often during the treatment of lung cancer.1,10
Mediastinoscopy and mediastinotomy
Mediastinoscopy is performed to get tissue from the area between the lungs. A surgeon makes a small incision in the front of the neck at the top of the breastbone. Then a thin, hollow tube with a light and a lens for viewing is inserted through the incision, along the front edge of the windpipe. Instruments are passed through the tube to take samples from the lymph nodes along the The airway that leads from the larynx (voice box) to the bronchi (large airways that lead to the lungs); also called "windpipe". The samples are sent to a laboratory to check for cancer cells. A mediastinoscopy requires general anesthesia and is performed in an operating room. A similar procedure, mediastinotomy, also gets tissue from the area between the lungs. This procedure makes an incision, a little larger than that in a mediastinoscopy. near the breast bone and between the left second and third ribs in order to reach lymph nodes unreachable by mediastinoscopy.1,10,11
Updated June 5, 2019
- Lung Cancer – Non-Small Cell: Diagnosis. American Society of Clinical Oncology website. http://www.cancer.net/cancer-types/lung-cancer-non-small-cell/diagnosis. Approved January 2019. Accessed June 4, 2019.
- Bronchoscopy. NIH National Heart, Lung, and Blood Institute website. http://www.nhlbi.nih.gov/health-topics/bronchoscopy. Accessed June 4, 2019.
- Bronchoscopy. NIH National Library of Medicine MedlinePlus website. https://medlineplus.gov/ency/article/003857.htm. Updated May 8, 2019. Accessed June 4, 2019.
- Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS TBNA). Seatle Cancer Care Alliance website. https://www.seattlecca.org/diseases/lung-cancer/endobronchial-ultrasound. Accessed June 4, 2019.
- Claude V. What You Need to Know About Biopsies for Lung Cancer. American College of Chest Physicians website. http://www.chestnet.org/News/Blogs/CHEST-Thought-Leaders/2017/17/05/What-you-need-to-know-about-biopsies. Posted May 31, 2017. Accessed November 29, 2017.
- Lung needle biopsy. NIH U.S. National Library of Medicine website. http://www.nlm.nih.gov/medlineplus/ency/article/003860.htm. Updated July 14, 2018. Accessed June 4, 2019.
- Needle Biopsy of the Lung. RadiologyInfo.org website. https://www.radiologyinfo.org/en/info.cfm?pg=nlungbiop. Reviewed April 10, 2018. Accessed June 4, 2019.
- Schneider F, Smith MA, et al. Adequacy of core needle biopsy specimens and fine-needle aspirates for molecular testing of lung adenocarcinoma. American Journal of Clinical Pathology. Volue 142, Issue 2, February 2015, Pages 193-200. https://academic.oup.com/ajcp/article/143/2/193/1766676. Published January 2, 2015. Accessed June 4, 2019.
- Thoracentesis. NIH National Heart, Lung, and Blood Institute website. http://www.nhlbi.nih.gov/health-topics/thoracentesis. Accessed June 4, 2019.
- Tests for Non-Small Cell Lung Cancer. American Cancer Society website. https://www.cancer.org/cancer/non-small-cell-lung-cancer/detection-diagnosis-staging/how-diagnosed.html. Revised June 23, 2017. Accessed June 4, 2019.
- Mediastinoscopy with biopsy. NIH U.S.National Library of Medicine website. https://www.nlm.nih.gov/medlineplus/ency/article/003864.htm. Revised May 15, 2018. Accessed June 5, 2019.