Yes because they have found evidence of cancer in Egyptian mummies.
Once you got past childhood and survived your early adulthood (and childbirth for women) your reasons for dying were the same as today - cancer, heart disease, strokes and such at a similar age.
This gets a little tricker from my understanding. It isn't just any cancer that has been found but I believe prostate cancer. Prostate Cancer rates have been increasing over the past few decades but rather than jumping on a bandwagon and assuming its caused by this or that, one must realize a few points, one being that at present we have an aging Boomer generation.
But more importantly my understanding if correct is that prostate cancer is definitely one that is found the older we get, almost to the point that an autopsy on elderly men in their 80s or 90s, even if they passed away from a heart attack, or something un related to Cancer, would be discovered more often than not to have traces of prostate cancer. It almost suggests that if a heart attack doesn't get you, by 105 prostate cancer might
So its not at all surprising to discover that prostate cancer, metastasized or not has been found in mummies. With what we know now, I believe it would be more surprising that it not be found, rather than found at all.