Is LCIS cancer or not?

Some people (myself included) have read on the internet that my kind of cancer really isn't cancer. I knew better because I knew that a pathologist verified the presence of cancer. So today, I looked in one more place on-line, the American Cancer Society, and here's what they say:

Lobular carcinoma in situ

Although not a true cancer, lobular carcinoma in situ (LCIS; also called lobular neoplasia) is sometimes classified as a type of non-invasive breast cancer, which is why it is included here. It begins in the milk-producing glands but does not grow through the wall of the lobules.

Most breast cancer specialists think that LCIS itself does not become an invasive cancer very often, but women with this condition do have a higher risk of developing an invasive breast cancer in the same breast or in the opposite breast. For this reason, women with LCIS should make sure they have regular mammograms.