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Hi, Captn, and welcome.
Stage IV lung cancer is a challenging diagnosis. At one time the outlook was pretty invariably grim, but we have folks here who are 10-year-plus survivors of Stage IV lung cancer--treatments have greatly improved and new discoveries are happening every day.
A lot depends on variables such as the exact type of lung cancer, where it has spread, what the genetic makeup is of the particular cancer (certain genetic markers in the cancer cells respond to certain types of targeted therapies), the age of the patient, how healthy the patient is otherwise, etc.
Figuring out how long someone might live with lung cancer is pretty much a guessing game. The most important thing is to be in the hands of experienced doctors who are able to recommend and provide the most promising treatments for the person's specific cancer. Every patient, and every cancer, is unique. If your friend isn't confident in his medical team, he might want to explore second opinions. I was lucky enough to have very early stage cancer (found through screening), but if I had Stage IV, I think I would be trying to get treatment at a teaching hospital that has a good record of treating lung cancer. Such hospitals often have access to the latest treatments, including clinical trials.
Your friend needs your support right now. You also might want to tell him about this website and forum so he can connect with others who have been treated or are currently being treated with the same therapies.
Welcome here. I'm sorry to hear about your health concerns and that you haven't been able to get a diagnosis. It sounds very frustrating. I have the same question that LexieCat has about what kind of doctors you've been seeing. If you haven't seen a pulmonologist, my first suggetion would be that you see one. My pulmonologist was able to tell me a lot from looking at my CT scan. She told me that one lung nodule was very suspicious for cancer due to its shape.She thought it was probably a primary lung cancer and not a metastasis from a different cancer I had previously. This turned out to be correct. She also told me that scarring in my lungs was likely from valley fever, an illness I was never aware that I had. This illness occurs where I grew up, but not where I have lived as an adult. So I thought she was very knowledgeable. This is why I recommend a pulmonologist.. If you have one and he or she can't answer your questions in a way you think is reasonable, you might want to get a second opinion. I'd also suggest seeing a neurologist, if you haven't already.
Best of luck getting some answers! Please keep us informed about what you find out.