Honestly lung cancer in a month kills and affects more women than breast cancer does in a year ( or something like that). It's a paradox that we are so fixated on breast cancer.
There are more cases of breast cancer in women alone (which... okay... only 1% of cases are males, but that still >2,000 cases) than lung cancer in both sexes combined. And it used to be insanely fatal. Now its one of the least fatal cancers out there because we have great screening algorithms, good public awareness, and specifically targeted drugs.
But all the research we spend on breast cancer is still required because we've realized something through it. This is our most researched cancer by a mile (some cancer had to be it) and we've managed to make what was one of the deadliest cancers out there become 90% survivable. But we've also learned that breast cancer, and cancer in general, is so much more complicated than we could ever imagine. Take LCIS for example. By all obvious metrics that is a cancer that should be cut out and its genesis has *nothing* to do with ductal forms. EXCEPT that DCIS will never go metastatic nor will it grow so we dont treat it as cancer, but it is a huge risk factor for ductal carcinoma, often in the other breast, by some mechanism *completely different* than the mechanism that made the original LCIS.
Every scientific conundrum needs an experimental model. Breast cancer is our experimental model because it was the ultimate cancer. It was ridiculously prevalent (only prostate cancer is more prevalent), it was crazy lethal (prostate cancer barely kills anyone, statistically), and it took away boobies. You don't pull funding while there is still so many unanswered questions that can be pulled from breast CA and applied to other cancers.
Of note: Lung cancer is almost as prevalent as breast cancer, and is very lethal... but back in the day it was not nearly as prevalent and back in the day breast cancer was equally/more lethal than lung cancer. Its only because we treat breast CA so well that lung cancer took over the title of best known killer.
Also of note: prostate cancer reigns supreme on frequency in the general population in the USA. It clocks in at tens of thousands above any other competitor, and it can only affect 50% of the population and its still #1. But it also has a 90% survival rate with pretty damn conservative urologic/oncologic treatments.
should other cancers get more coverage? sure, if they can raise their own awareness and money. But dont pull the funding or attention from the experimental model we've had such success with. Especially since we have no damn clue what to do with bronchogenic carcinoma and no amount of money is going to fix that overnight.