According to Global Market Insights, the global lung cancer market size is $29.5 billion in 2022, and diagnostics segment of lung cancer is $14 billion in 2022. It is reasonable to conclude that the total market is $29.5 billion and the total addressable market is $14 billion. Target market's calculation requires a bit more bottom-up analysis.
‍
In 2022, the total population in the USA, Japan, Europe, United Arab Emirates , Uruguay, Chile, Saudi Arabia, and Canada is roughly 1.293 billion people. The median age of a cancer diagnosis is 66 years old according to the National Cancer Institute, so it would be appropriate for everyone aged 50, 60, 70, 80, and 90 take the diagnostic test. Using "census.gov" and assigning the USA's aged population as being roughly equivalent to the other listed countries, one can then equate that those four age groups are roughly 2.04% of the total population. A diagnostic test is likely to generate $100 in revenue per person tested. Using the equation of target market = (at risk population in developed countries)x(revenue per test administered), one can calculate that there is a $2 billion target market for lung cancer detection.