@Angrymum22 When you say the majority of breast cancers - I suppose you mean Grade 1, Luminal A, oestrogen positive ones? - yes, they are very slow growing aren't they, and usually need minimal treatment and have an excellent prognosis. They are the most common type and the public image of breast cancer.
However, mine was unfortunately not oestrogen positive and was grade 3 rather than 1. It grew astronomically faster than taking 2-5 years to be large enough the feel. In less than 2 years, it was already all over my lymph nodes (up to collar bone) and an enormous mass. My subtype can go from nothing to stage IV in a year. It used to be completely deadly until targeted therapies around 20 or so years ago which have made a very significant difference to survival, although it remains a super-aggressive type of breast cancer that often metastesises to the brain. Early diagnosis and treatment is vital and the delays the NHS forced me to endure put me at increased risk of recurrence.
I didn't have the oncotype test. Not for my subtype: my type needs chemo at every stage. There was no justification for the delays. The reason was that no staff were available to do the biopsy and the CT was fully booked. For WEEKS. As for my original 2WW appointment being so delayed, they never did explain why.
I agree with you completely about the complexity, and that breast cancer is a collection of various very, very different diseases with different drivers behind the cancer, different prognoses, treatments and outcomes. I think that applies to all body parts though: there are multiple diseases all called 'cancer' in each body part.
You said they were considering changing the name from cancer. I would support that. People are misled with breast cancer survival statistics because the majority have such a slow growing, easy to treat subtype, and the rest of us in the minority face far worse statistics and awful treatments with months of aggressive chemo, weeks of radiotherapy, etc etc and worse prognoses BUT the general public think breast cancer is simply a lumpectomy and possibly a pill for a few years. I wish they'd name each cancer according to the subtype, driver, grade, as well as body part.
@Snackpocket I hope your Dad will be ok.