No one here is going to sugar coat this for you, the figures that you noted do not present with good prognostic indications. However; there is no way of knowing how far this disease has spread until you have subsequent staging done.
So you'll undergo a Sentinel Lymph Node Biopsy to determine your lymphatic staging. If that is negative (Hopefully it is!!) then you could look into clinical trials for Stage II. If it is positive, then they'd reccomend either further surgery for purposes of a clinical trial (this would be a removal of all of the lymph nodes in the are and not just a few like the Sentinel Node Biopsy).
My entire take away is this:
1. Make sure you are being seen by a Melanoma specialist.
2. Every individual is different, and just because your primary was deep does not mean you have metastatic disease.
3. The comment above mine says you should be "worried". My advice is to save your energy from worry until
you know more, until you have a plan with your provider, and until you are doing something. Concern, stress, and anxiety are all normal. No one should tell you how to feel!
Remember- there are statistics that take patients with your prognostic factors and measure their outcomes. In a group of 100 people, those figures may not be very positive. However; every individual is different. Your body responds differently, it may engage its immune defenses in a different way than those 99 other people. It does not mean you are doomed, you do not have enough real time information yet to validate that assumption, but it does mean it's time to get serious and that begins with a specialist.
My advice from here- perhaps you research a little more the stories of others in your situation on this incredibly resourceful site.
Wishing you my best of luck.
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