According to a book I've got here. Written by Dr. John Link MD. He's a
practicing internist/oncologist. He's the founder of the
Multidisciplinary Breast Center in Long Beach, Calif. {ranked as on of
America's ten best breast cancer centers

It states it this way
Cancer Staging Number:
T1  0-20mm {0-2 cm}
T1a 0-5mm {0-.5 cm}
T1b 5-10mm {.5-1 cm}
T1c 10-20mm {1-2 cm}
T2 20-50mm {2-5 cm}
T3 >50mm {>5cm}

I hope this helps you out abit. I've gotten several books since being dx
in 1999. {the first time} I had a recurrance in Nov of 2002. I had
surgery {mrm right side} and chemo and completed treatments in June of
2003 and so far so good. {everything is crossed here} If you need
anything else just let me know, okay? Private emails are fine also.
Take care there dear/God bless
annie

Ultimately.....we know deeply that the other side of every fear is a
freedom.

"Courage"...is *fear* that has said it's prayers.