Hi lubylou
I commented on your other thread before I saw this one - was out all day/eve yesterday!
The point is (as I said on the other thread) if your lining thickens on a conti HRT the progestogen is not doing its job so this could be a worry because of the potential for endometrial hyperplasia and possible cancer. If over-thickening does occur then women can get oestrogen breakthough bleeding but not always ie it could thicken by a considerable amount before this happens I understand.
Clearly in a cycle the lining goes through the cycle of growing - proliferative (oestrogen), to secretory (when the progestogen is added) and then shedding. As I mentioned below ( I think - can't see my post - must be on the other page) the progestogen acts on the oestrogen primed uterus lining in a dose dependent manner so all the lining (that has grown due to oestrogen) is not necessarily shed each time if the dose of progestogen is not sufficient relative to the oestrogen. It should be (shed), because the doses of progestogen are calculated to be more than sufficient - but we are all individual and there are bound to be one or two women for whom it doesn't work exactly as it should.
Sarah - the endometrium is made up of different layers of cells. The biology of it all is quite complex!
Therefore lubylou you are asking different things - it would be much more of a worry to get an over-thickened lining on a conti HRT, but cyclical thickening on a cyclical HRT is normal, and the way to test for over-thickening in this case would be following a bleed when the lining has been shed - ie scan the thickness of the residual lining.
As I think I mentioend Tibolone is associated with some increased risk of endometrial hyperplasia - the manufacturer's information states this:
Endometrial cancer
•
The available data from clinical trials are conflicting, however, observational studies suggest that women who are prescribed tibolone in normal clinical practice may be at an increased risk of having endometrial cancer diagnosed. The risk increases with increasing duration of use but shows no significant increase during the first 2-3 years of use (see section ADVERSE REACTIONS). Tibolone increases endometrial wall thickness, as measured by transvaginal ultrasound.
I hope this helps!
Hurdity x