Critical Care Registered Nurse (CCRN) Practice Exam

Which of the following types of cancers is most prevalent in metastatic tumors?

1. Lung

2. Prostate

3. Bladder

4. Thyroid

The correct answer is: Lung

Lung cancer is the most prevalent type of cancer associated with metastatic tumors due to several factors. The lung is a highly vascular organ, which means that cancer cells from various primary sites are prone to spreading through the bloodstream to the lungs. Additionally, lung cancer itself can frequently metastasize to other organs, making it both a common primary site for metastasis and a target for secondary tumors. Metastasis occurs when cancer cells detach from the primary tumor, travel through the bloodstream or lymphatic system, and form new tumors in other organs. Because lung cancer has a high rate of spread and the lungs are a common site for metastasis from other cancers, it stands out in discussions about metastatic tumor prevalence. In contrast, while prostate, bladder, and thyroid cancers can also lead to metastatic disease, they are not as frequently seen as primary contributors to metastatic tumors in other organs as lung cancer is. Prostate cancer typically metastasizes to bones, while bladder cancer often spreads to lymph nodes and other parts of the urinary system. Thyroid cancer can metastasize as well, but it is generally less common compared to lung cancer's role in metastasis.