Stage is determined by size and whether it has spread to distant areas
her2+ivity does not alter stage.
The TNM staging system has been around for many, many decades as has the grading system.
her2 testing has been around ~ 20-25 years(I just looked up Dr. Slamon's seminal article and it was 22 years old) and has only been done commonly for the last 5-10--3-4 in some areas of the US and 1-2 in some areas of the world. Many countries do not have the means/talent to do the testing at all.
Perhaps what you remember is that despite the small size of your tumor, the fact that it was her2+ caused them to consider you at higher risk than you would otherwise be.
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