Cancer Lung Cancer Diagnosis Overview of Bronchioloalveolar Carcinoma Lung Cancer Print By Lynne Eldridge, MD Updated August 27, 2018 Show Article Table of Contents Overview How Does BAC Differ From Other Lung Cancers? Symptoms Diagnosis Treatments Prognosis View All Back To Top RoBeDeRo / Getty Images More in Lung Cancer Diagnosis Non-Small Cell Small Cell Causes & Risk Factors Symptoms Treatment Living With Support & Coping As of July 2016, BAC (Bronchioloalveolar carcinoma) is a term which is no longer in use but was used between 2004 and 2011 to define a particular subtype of lung adenocarcinoma. That said, some oncologists still use this term, so the history and characteristics of what was once classified as BAC will be described here. Bronchioloalveolar carcinoma of the lungs (BAC), as noted above, has now been reclassified as a form of lung cancer. That said, research on BAC can still be helpful in describing this particular type of tumor, and some oncologists may still use the term. In the past, when BAC was used as a classification of lung cancer, this type of cancer was thought to account for 2 percent to 14 percent of all lung cancers, though less was known about this type of non-small cell lung cancer. For this reason and more, BAC (and now the subtype of lung adenocarcinoma to which it has been reclassified) has been referred to as the "mystery of lung cancer." Overview As noted above, BAC has now been reclassified under the heading of lung adenocarcinomas, but since this term is sometimes still used by clinicians, it will be described here in the old setting. In the new classification, BAC may be referred to as "lepidic predominant adenocarcinoma" based on the typical growth pattern of the tumor. BAC develops in cells near in the small air sacs (alveoli) in the outer regions of the lungs. It spreads either along the tissue that separates the alveoli or through the airways. Unlike other forms of lung cancer that often spread to the lining of the lungs (the pleura) and other regions of the body, BAC spreads primarily within the lungs. It can appear as a single spot in the periphery of the lungs, or as scattered spots throughout the lungs. There are 2 main types of BAC: non-mucinous BAC is more common and found more often in smokers, and mucinous BAC, which is less common and often found in non-smokers. How Does BAC Differ From Other Lung Cancers? BAC is more likely to affect non-smokers, women, and Asians (especially eastern Asians) than other forms of lung cancer. Its incidence appears to be increasing, especially among younger non-smoking women. Symptoms Symptoms of BAC are similar to symptoms seen with other lung cancers, and include a persistent cough, coughing up blood (hemoptysis), and chest pain. But it has also been called the “masquerader.” It is not uncommon for BAC to be mistaken for pneumonia or other lung diseases before it is diagnosed. Diagnosis BAC diagnosis is also similar to the diagnosis of other lung cancers, with a few exceptions. A diagnosis of BAC requires a sample of tissue, and fine-needle aspiration biopsy can provide the diagnosis roughly half the time. Unlike other lung cancers, where PET scans are helpful in addition to CT scans in determining where cancer is present, PET scans are less reliable. Staging (stages 1 to 4 or TNM staging) is similar to staging other forms of lung cancer. Treatments Surgery is the treatment of choice for BAC, and when a single tumor can be removed, there is often a good chance that it will be cured. It appears to be less sensitive to traditional chemotherapy, and there is controversy over whether or not adjuvant chemotherapy (chemotherapy given along with surgery) should be used with surgery. BAC does appear to be more sensitive to the newer targeted therapies, treatments designed to target specific gene mutations within the tumor. People with this type of lung cancer should have genetic testing (molecular profiling) done on their tumor. There are now treatments approved for these lung cancers which have EGFR mutations, ALK rearrangements, and ROS1 rearrangements, with medications being used in clinical trials for those with other genetic changes in their tumors as well. Lung transplants are being looked at as an additional treatment, and if the cancer does not recur in the transplanted lungs, it offers another chance for long-term survival. Prognosis In general, the survival rate is significantly better for BAC than for other forms of non-small cell lung cancer, especially when it is caught early and only one tumor is present. In one study, those who were diagnosed with BAC and had tumors less than 3 centimeters in diameter, had a 5-year survival rate of 100 percent with surgery. With later stages of the disease survival rates vary considerably, depending on factors such as separate tumors in the same lobe, lymph node involvement, and distant spread of the tumor. Was this page helpful? Thanks for your feedback! Limiting processed foods and red meats can help ward off cancer risk. These recipes focus on antioxidant-rich foods to better protect you and your loved ones. Sign up and get your guide! Email Address Sign Up There was an error. Please try again. Thank you, , for signing up. What are your concerns? Other Inaccurate Hard to Understand Submit Article Sources Arenberg, D., American College of Chest Physicians. Bronchioalveolar lung cancer: ACCP evidence-based clinical practice guidelines (2nd edition). Chest. 2008. 132(3 Suppl):306S-13S. Butt, U., and T. Allen. 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