In general, I would say that if any part of you has cancer, no part of you is safe, but some parts may be more easily affected based on the type of cancer. For instance, some can spread by proximity, or because the cancer cells got into the lymphatic system, the blood, or other method that may enable it to spread to an organ of a different tissue type.
With breast tissue, it is important to remember breast tissue cells can happen naturally anywhere along the human milk line, which goes from armpit to groin on each side. Normally this tissue is not active, many will never notice it, beyond maybe a supernumerary nipple, although some in pregnancy or during breastfeeding sometimes have lumps along the line. So, yes, you can have breast cancer in your armpit or lower ribcage.
I am not a medical professional, just a former patient remembering how it was explained to me.
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