Hi Cheryl,
Firstly, if you had an endo biopsy that should have picked up any cancer cells. (It is not always possible to do this in the doctor's office if the neck of the womb is too tightly closed and then a D&C is often necessary)
Were you told that the lining of your womb is too thick? (I am not sure what .8 means!) Please read the following extract from a web site:-
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Any woman with bleeding after the menopause or abnormal bleeding must see a gynaecologist urgently. A smear test is always done but this may be negative even if there is cancer. The gynaecologist may manage to get a sample of tissue from inside the womb in the clinic. An ultrasound scan may arranged to measure the thickness of the lining of the womb. If this is less than 4mm cancer is unlikely. More likely, an examination of the lining of the womb with a fine telescope (hysteroscopy) and sampling of the lining of the womb (D & C) will be arranged. This may be done as a day case operation under general anaesthetic or in the clinic under local anaesthetic.
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If the lining of your womb is too thick then you may have a condition called endometrial hyperplasia. (See
http://my.webmd.com/content/article/1680.51528) This can be treated with hormones. Be careful though - it can sometimes lead on to cancer, so you should be checked again after treatment to see that all has returned to normal (something that never happened for me!!!)
I think you need to ask your doctor some more questions and to find out if the lining of your womb is thicker than 4mm. If it isn't, then I wouldn't worry too much - especially as your endo biopsy didn't detect any cancer cells.