Science Current Events | Science News | Brightsurf.com
 

Measuring progesterone receptor expression to improve hormone-receptor-positive cancer management

May 03, 2012
Presentations at the 4th IMPAKT Breast Cancer Conference

American and Spanish researchers have found potential ways for doctors to improve the treatment of hormone receptor-positive breast cancer even if they lack access to costly multi-gene tests, as they report at the 4th IMPAKT Breast Cancer Conference.

Because breast cancer is a biologically and clinically varied disease, doctors aim to choose appropriate treatments based on the characteristics of each patient's individual tumor. In the past, this has been done using pathology-based biomarkers; however these do not capture the full diversity of cancers.

"In this context, tests based on multi-gene expression have been shown to provide valuable information beyond the pathology-based biomarkers," says Dr Aleix Prat from the University of North Carolina, Chapel Hill. "However, multi-gene tests are not readily available in most of the world due to cost, assay turnaround times and other logistic issues."

Dr Prat and colleagues addressed this problem by trying to improve the current pathology-based biomarkers to better represent data coming from a particular multi-gene test known as the PAM50 breast cancer intrinsic classifier.

"The PAM50 breast cancer intrinsic classifier identifies two major groups of hormonal receptor-positive breast cancer known as the Luminal A and Luminal B subtypes. These two molecular entities have different risks of relapse and responses to chemotherapy," Dr Prat said.

Alongside the development of this multi-gene assay, clinicians have devised pathology-based surrogate assays for the identification of both the Luminal A and Luminal B subtypes. "In the absence of multi-gene assays, the pathology-based assays are clinically valuable," Dr Prat explained. "However, we observed that the current pathology-based definitions of the Luminal A and Luminal B subtypes still show a 30-40% discordance rate compared to multi-gene tests such as the PAM50 breast cancer intrinsic classifier."

The researchers examined differences in gene expression patterns between Luminal A and Luminal B tumors using the PAM50 test. They also collected clinical-pathological features from 2,950 primary tumors across four independent studies. Using statistical methods, they tested the independent prognostic significance of those features.

They found that the expression of progesterone receptor was one of the most discriminatory molecules. "Addition of quantitative scoring of the progesterone receptor into the current pathology-based Luminal A definition appears to better identify the subgroup of patients that have an outstanding survival when treated with endocrine therapy alone, and therefore do not need systemic chemotherapy," Dr Prat said. "This subpopulation of patients is likely to represent around 30% of the patients with low-risk pathology-defined Luminal A tumors."

"Current pathology-based definitions of the Luminal A and Luminal B subtypes are valuable, but can be improved for the management of hormonal receptor-positive breast cancer," the researcher concluded. "We believe that we have an improvement based upon the progesterone receptor, and given that progesterone receptor is widely used, our improvement could be widely and quickly adopted, if further validated."

According to Dr Di Leo, Hospital of Prato, Italy, former IMPAKT Chair, this is an important study with practical implications, because it tells us that the evaluation of the progesterone receptor along with the evaluation of other biomarkers, such as the estrogen receptor, proliferation markers and c-erbB2, may be relevant to better define the biological profile of the tumor. "This is a critical step towards a personalized medicine approach in breast cancer. It will be important to test the progesterone receptors according to a standardized approach across the pathology departments. One potential concern, in fact, could be the use of different techniques for the progesterone receptors evaluation, which might lead to discordant results between different pathology labs."

European Society for Medical Oncology


Related Breast Cancer Current Events and Breast Cancer News Articles


Breast screening for over 70s doesn't prompt sharp fall in advanced disease
Instead, it may just lead to overdiagnosis and overtreatment, suggest the researchers, led by a team based at Leiden University Medical Centre in the Netherlands.

African American Women Receive Less Breast Reconstruction after Mastectomy
Dartmouth researchers have found that African American women are 55 percent less likely to receive breast reconstruction after mastectomy regardless of where they received their care.

CNIO successfully completes its fisrt clinical trial on HER-2-negative breast cancer with nintedanib
The experimental drug nintedanib, combined with standard chemotherapy with paclitaxel, causes a total remission of tumours in 50% of patients suffering from early HER-2- negative breast cancer, the most common type of breast cancer.

'Electronic skin' could improve early breast cancer detection
For detecting cancer, manual breast exams seem low-tech compared to other methods such as MRI. But scientists are now developing an "electronic skin" that "feels" and images small lumps that fingers can miss.

Penn Study Finds Genetic Mutations Linked With Ethnic Disparities in Cancer
One of the goals of genome sequencing is to identify genetic mutations associated with increased susceptibility to disease.

Novel Immunotherapy Vaccine Decreases Recurrence in HER2 Positive Breast Cancer Patients
A new breast cancer vaccine candidate, (GP2), provides further evidence of the potential of immunotherapy in preventing disease recurrence.

Penn team finds ovarian cancer oncogene in 'junk DNA'
Over the years researchers have made tremendous strides in the understanding and treatment of cancer by searching genomes for links between genetic alterations and disease.

Women & Infants Breast Cancer Specialist Reports Advance in Treatment of Triple-Negative Breast Cancer
William M. Sikov, a medical oncologist in the Breast Health Center and associate director for clinical research in the Program in Women's Oncology at Women & Infants Hospital of Rhode Island, served as study chair and lead author for a recently-published major national study that could lead to improvements in outcomes for women with triple-negative breast cancer, an aggressive form of the disease that disproportionately affects younger women.

Study reveals breast surgery as a definitive and safe treatment for elderly patients
A study conducted by National Cancer Centre Singapore (NCCS) has shown that age per se is not a contraindication to breast cancer surgery, and such surgeries may be safely performed for women aged 80 years and above.

Research finds no association between wearing a bra and breast cancer
A population-based case-control study found no association between bra wearing and increased breast cancer risk among postmenopausal women, according to research published in Cancer Epidemiology, Biomarkers & Prevention, a journal of the American Association for Cancer Research.
More Breast Cancer Current Events and Breast Cancer News Articles

Let Me Get This Off My Chest: A Breast Cancer Survivor Over-Shares

Let Me Get This Off My Chest: A Breast Cancer Survivor Over-Shares
by Margaret Lesh (Author)


Tamoxifen hot flashes, mastectomy, reconstruction, breast cancer etiquette, Frankenboobs, bras with special attachments—Margaret Lesh shares all in her funny, heartfelt collection of essays, anecdotes, and life lessons from the perspective of a two-time breast cancer survivor. She’ll tell you when it’s okay to play the cancer card, what you should take to the hospital, and gives suggestions on how to cope in those dark moments of the soul. With practical tips sprinkled throughout, LET ME GET THIS OFF MY CHEST explores how breast cancer changed her outlook on life, offering honest insights, humor, and sensitivity as she looks for the silver lining in a not-so-great situation. Whether you are a woman diagnosed with breast cancer or whether you know someone with breast cancer, this...

An Inconvenient Year

An Inconvenient Year
by Original Writing


It is a book that deals with the social side of cancer, as a parent, a lover and a friend. It is a story of coping with uncertainty, the reactions of others and living with them too. It documents the total shock and utter fear that a diagnosis brings and the hopelessness of surrendering to a treatment that brings its own baggage yet ultimately insures life. It talks about confronting hair loss along with discovering the more covert assault on all things feminine. Yet at the very root of the book, ahead of the fear and anger, there is humour and laughter. Though the story of cancer has been told before, it has not been told like this"

Fight Now: Eat & Live Proactively Against Breast Cancer

Fight Now: Eat & Live Proactively Against Breast Cancer
by Aaron Tabor, MD


Dr. Tabor’s FIGHT NOW book provides information on lifestyle choices that might improve breast health and overall health. The purpose of Dr. Tabor’s medical research is to empower you to become proactive against breast cancer now with specific food and lifestyle choices. We can make specific food and lifestyle choices to lower the risk of getting breast cancer, risk of recurrence, and risk of dying from breast cancer. The only alternative is to be reactive after you get breast cancer or have a recurrence of breast cancer. The choice is clear

Whether you are currently fighting breast cancer; are a survivor; or, simply trying to lower your risk, Dr. Tabor’s FIGHT NOW book will give you concise, critical information that you can start using today. You don’t have to read...

The Mayo Clinic Breast Cancer Book

The Mayo Clinic Breast Cancer Book
by By the breast-health experts at Mayo Clinic Cancer Center (Author)


    
     From the breast health experts at Mayo Clinic comes a guide to the many aspects of breast cancer—from prevention, to care and coping, to survival, to living with hope. Trustworthy information offered in a spirit of companionship.

     
     The Mayo Clinic Breast Cancer Book is the trusted resource for anyone wanting reliable information about this dreaded disease. Mayo Clinic set out to provide comprehensive and up-to-date facts in easy-to-understand language. They've succeeded in this handbook for those who've been diagnosed, or for those who want to give sensitive and helpful support to someone with breast cancer. The Mayo Clinic Breast Cancer Book stands out for its tone of companionship, as well as for the many patient stories that appear...

The Breast Cancer Survival Manual, Fifth Edition: A Step-by-Step Guide for Women with Newly Diagnosed Breast Cancer

The Breast Cancer Survival Manual, Fifth Edition: A Step-by-Step Guide for Women with Newly Diagnosed Breast Cancer
by John Link (Author)


The updated edition of the essential resource for the 250,000 women diagnosed with breast cancer each yearBreast cancer is the leading cause of death in women from thirty-five to fifty-four years of age, and few things are as terrifying and confusing as a diagnosis of this disease. The fifth edition of The Breast Cancer Survival Manual is a concise, information-packed guide that is newly revised to contain all of the latest findings to help the woman facing treatment feel informed and empowered. John Link, M.D., a pioneer developer of Breastlink Medical Group in Southern California includes the most current medical advice on     • Tamoxifen, Herceptin, and other chemotherapy options      • The growing importance of HER2 oncogene testing      • Clinical research trials...

Just Get Me Through This! - Revised and Updated

Just Get Me Through This! - Revised and Updated
by Deborah A. Cohen (Author), Robert M. Gelfand M.D. (Author)


Warm, reassuring, and practical advice for surviving breast cancer -- from someone who was there.

Breast Cancer (2014): 150 Latest & Illustrated Questions & Answers

Breast Cancer (2014): 150 Latest & Illustrated Questions & Answers


Why this book -- what is so exciting in the field of breast cancer? Take a look:* Many early breast cancers, with timely and appropriate treatments, are now curable.* The five-year survival rate of cancers confined to the milk ducts and milk lobules (DCIS & LCIS) has gone up to 100%.
*For the first time FDA labels a promising & new breast cancer drug the title of "Breakthrough" drug which doubles Progression Free Survival and extends overall survival (Ch:13).* The five-year survival of Stage 1 (larger tumor or lymph node-positive tumor) has gone up to almost 90%.* During the past 60 years, regardless of how advanced the breast cancer is, the average number of women who survive for 10 years has increased by 300%. And about 90% of women diagnosed with breast cancer will survive at...

Cancer: What I Wish I Had Known When I Was First Diagnosed: Tips and Advice From a Survivor

Cancer: What I Wish I Had Known When I Was First Diagnosed: Tips and Advice From a Survivor
by Michele Ryan (Author)


A cancer diagnosis results, understandably, in fear and uncertainty. Once the initial shock passes, the questions begin. Some are medical in nature: What are your treatment options? Some are intensely personal: How do you tell your children? Will your hair grow back after chemo? How will the disease affect your sex life and relationships? In Cancer: What I Wish I Had Known When I Was First Diagnosed, ten-year breast cancer survivor Michele Ryan answers these questions and more. Michele's common sense advice and practical tips provide a comprehensive road map to help navigate the basic challenges of life with cancer. She covers everything from how to evaluate your health insurance to what to pack for hospital stays, all carefully laid out in an easy-to-navigate format so readers can find...

Dr. Susan Love's Breast Book, 5th Edition (A Merloyd Lawrence Book)

Dr. Susan Love's Breast Book, 5th Edition (A Merloyd Lawrence Book)
by Susan M. Love MD (Author), Karen Lindsey (Contributor)


Dr. Susan Love's Breast Book has long been the bible for the newly diagnosed. In this completely revised fifth edition, it also becomes a guide for those at risk of getting breast cancer, survivors interested in the consequences of their treatment, and anyone who wants to understand the new research about how the local environment influences the manifestations and treatments of many different kinds of breast cancer. Major advances being made in genetic research today mean that prevention and treatment can work not only to get rid of mutated cells (through chemo or surgery), but also to change the environment around the cells (through hormone therapy, exercise, and stress reduction). Among other promising developments discussed are advances in imaging, recognition of breast density as a...

Chicken Soup for the Soul: Hope & Healing for Your Breast Cancer Journey: Surviving and Thriving During and After Your Diagnosis and Treatment

Chicken Soup for the Soul: Hope & Healing for Your Breast Cancer Journey: Surviving and Thriving During and After Your Diagnosis and Treatment
by Dr. Julie Silver (Author)


Chicken Soup for the Soul: Hope & Healing for Your Breast Cancer Journey will encourage comfort and encourage breast cancer patients and survivors with its inspiring stories and helpful medical information.

A support group from breast cancer diagnosis through treatment to rehabilitation and recovery, this book combines inspiring Chicken Soup for the Soul stories written just for this book and accessible leading-edge medical information from Dr. Julie Silver of Harvard Medical School. Patients and survivors will find comfort, strength and hope.

© 2014 BrightSurf.com