Breast Cancer - Moose and Doc

A breast cancer explanations website

 

May 7, 2019 By Dr. Halls

Breast Adenocarcinoma

breast adenocarcinomaThe term ‘breast adenocarcinoma’  is an over-arching term used for breast cancers.

Adenocarcinoma refers to a type of cancer that begins in the glandular tissue cells that have a secretory function.

Both the breast ducts and lobules contain a lot of glandular tissue. Therefore, many breast cancers that start in the breast ducts or lobules fall under the category of adenocarcinomas.

There are many glands that line the organs of the human body, thus adenocarcinomas can occur around the body too.  For example, in the colon, lung cancer, prostate, esophagus or pancreas.

Betty Betty
So, adenocarcinoma is a type of breast cancer that starts in the cells of the glands?

Dr. Halls Dr. Halls
Yes, and according to the National Cancer Institute, around 90% of breast cancers are adenocarcinomas.

Dr. Halls Dr. Halls
However, adenocarcinoma is an ‘umbrella term’ for about 30 different types of breast adenocarcinomas (or cancers).


 
 

Lobes, Lobules and Ducts

Each breast typically has around 15 to 20 sections called lobes and many smaller sections called lobules. The lobules produce breast milk.  The breast milk is secreted into the breast ducts and then carried towards the nipple.

Most breast cancers start in either the breast ducts or the lobules. For this reason, both ductal and lobular breast cancers are referred to as breast adenocarcinomas.

The earliest forms of breast cancer are ductal carcinoma in-situ (DCIS) and lobular carcinoma in-situ (LCIS). In DCIS, the abnormal cells are present but still contained in the milk ducts. Likewise, with LCIS the abnormal cells are found in the breast lobules but have not yet spread to surrounding tissues.

Hence, the term ‘in-situ’ means that the abnormal cells are ‘in the same place’ or have not spread yet. The prognosis for both DCIS and LCIS is excellent.

The two main types of adenoma-carcinoma are:-

  1. Invasive ductal carcinoma (sometimes called infiltrating ductal carcinoma
  2. Invasive lobular carcinoma (sometimes called infiltrating lobular carcinoma)
David David
…and all this time I thought lobes were attached to the ears!

Hector Hector
Yeah, and I thought ducts were part of air-conditioning units …

Brittany Brittany
Boys!


 
 

1) Lobular adenocarcinoma

Lobular carcinomas are actually less common than ductal carcinomas accounting for around 10% to 15% of breast cancers.

However lobular carcinomas tend to have a better prognosis than ductal carcinomas.  Lobular breast cancer has a 5-year survival rate of 77% to 93% with an average of around 90%.

2) Invasive Ductal Carcinoma

Around 80% of breast cancers are the infiltrating ductal carcinoma variety of adenocarcinoma.

However, there are also a number or rarer, specialized forms of adenocarcinoma. The subset of cancers listed below account for no more than 6% of all breast cancers.
breast adenocarcinoma

  • Inflammatory breast cancer accounts for between 1% and 6% of all breast carcinomas.
  • Medullary breast carcinoma accounts for 3% to 5% of breast cancers.
  • Mucinous breast carcinoma accounts for about 3% of breast cancers.
  • Tubular breast carcinoma accounts for only 1% to 2% of all breast cancers.
  • Cribriform breast carcinoma accounts for 5% to 6% of all breast cancers.
  • Papillary breast carcinoma accounts for between 1% to 2% of all breast cancers.

Note: Because lobular invasive cancer is quite rare, some medical specialists argue that it should be included in the above sub-group.  There are, of course, many other subtle variations and hybrid presentations of this core group of specialized adenocarcinomas.

Dr. Halls Dr. Halls
A really important point to remember is that the 5-year survival rate for all breast cancers is around 89.7%. Furthermore, that statistic is from 2006 to 2012 so it is probably even higher.


 
 

Immunochemical stains can determine if suspected breast cancer is Adenocarcinoma

The microscopic examination of a breast biopsy specimen usually involves the staining of a cell sample to determine the presence of various proteins or hormones.

breast adenocarcinomaAnalysis of the immunohistochemistry staining process can greatly assist in the differential diagnosis of breast cancers. Furthermore, the staining process can help determine the feasibility of adjuvant chemotherapy treatment.

For example, around 72% of breast adenocarcinomas overexpress the H19 gene as compared to healthy tissues. Notably, normal breast tissue does not express H19 RNA in the mammary glands, except during puberty and pregnancy.

Hormonal receptors for estrogen (ER+) and progesterone (PR+), the Wilms tumor susceptibility gene 1 (WT1) and gross cystic disease fluid protein (GCDFP) are also useful for the diagnosis of breast adenocarcinoma.

Talking Moose
Talking Moose
Wow! That last bit is very complicated. I am ‘mooseified’ Doc!

Dr. Halls Dr. Halls
Yes, but very simply, it means the affected breast cells are examined under a microscope to help with a diagnosis and treatment choices.

Talking Moose
Talking Moose
Well, you could have just said that.


 
 


Handy Questions & Answers

What are the treatments for invasive breast adenocarcinoma?

Treatment for invasive breast adenocarcinoma may include:-

  • Breast surgery: either a lumpectomy to remove the tumor or a mastectomy
  • Chemotherapy
  • Radiation Therapy
  • Hormonal medication
  • Targeted Therapy

What are the two main types of adenocarcinoma?

The two most common types of breast cancer are ductal carcinomas and lobular carcinoma.

What are the symptoms of invasive ductal carcinoma?

Dr. Halls

The symptoms of ductal carcinoma can include the following:-

  • Breast lump or mass
  • Thickening of the skin on the breast
  • A rash, redness or swelling of the breast
  • Dimpling around the skin or around the nipple
  • Nipple Discharge
  • An inverted nipple (nipple turning inwards)
  • Lumps under the arm (lymph node swelling)
  • Changes in the feel or appearance of the nipple or breast that are different from the normal monthly changes a woman experiences

Remember, however, that there may a combination of the above symptoms or just one or two.

What are the symptoms of lobular carcinoma?

Often, in the earliest stages, lobular carcinoma causes no signs or symptoms.  Lobular invasive breast cancer may cause an area of thickening in the breast. Likewise, there may be an area of ‘fullness’ or swelling in the breast.

The appearance of the skin over the affected breast may change and appear dimpled. The nipple can become inverted.

Please note, however, that lobular breast cancer is less likely than other types to cause a firm breast lump.

Jessica Jessica
There is a great campaign called ‘know your lemons‘ to educate women about the symptoms of breast cancer.

Talking Moose
Talking Moose
Yes, I’ve seen that. All women need to take a good old look at their melons and compare them to these lemons.


 
 


References

  • Adriaenssens E, Dumont L, Lottin S, Bolle D, Leprtre A, Delobelle A, Bouali F, Dugimont T, Coll J, Curgy JJ. (1998) H19 overexpression in breast adenocarcinoma stromal cells is associated with tumor values and steroid receptor status but independent of p53 and Ki-67 expression. Am J Pathol. 1998 Nov;153(5):1597-607. https://www.ncbi.nlm.nih.gov/pubmed/9811352
  • Caylor H. Bilateral Adenocarcinoma of the Breast. Annals of Surgery ( April 1929) – Volume 89 – Issue 4 – p 549-551

More references for this post are on this page.

Back to Types of Lesions list or to the brand new breast cancer homepage.

About Steven Halls

Dr Halls has 25 years experience as a radiologist. He worked for 13 years at Cross Cancer Institute in Edmonton, a world-class cancer treatment facility. He has had high-volume experience with cancer, interventional procedures, clinical trials and his own phase 1 and 2 research in MRI and breast cancer staging.

 

Copyright © 2000–2023 · by Steven Halls, MD · [email protected] · 1-780-608-9141 · Contact, Privacy, Terms