Lainy, you are very welcome.
By the way:
R1 = microscopically positive margins
R2 = macroscopically positive margins, or gross positive margins
In both cases, cancer cells are present at the margins.
In R1 case, the cells are not visible to a naked eye. They are discovered during pathology exam after the surgery.
In R2 case, the surgeon can usually see the bad parts but cannot do anything to improve the margins.
N0 = clear lymph nodes
N1 = positive lymph nodes