Paul is right about the insitu vs invasive. A lesion can be small but still be invasive. This is why this cancer is so tricky. I wouldn't get too caught up in the staging. While on some level it is important to know that. To me a better indicator is its differentiation, and nodular involvement, and amount of time from the appearance of the lesion to possible spread to the nodes. This is a good indicator of how aggressive this cancer is.

I only say this because knowing this other information will indicate what potential treatment you will likely go through and whether your dr. Is being aggressive with his treatment.

Not that I think there is ever overkill with treatment (frankly no one ever complained of getting too much treatment - but some have complained of not enough)

Invasive or not though... I always say push push push. This is cancer you want it dealt with by a top dr. And as quickly as possible. Take care.