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Old 11-21-2017, 10:42 AM   #1
Cathya
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New Therapeutic Target for ER+ BC

Mount Sinai researchers identify new therapeutic target for ER+ breast cancer
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November 17, 2017
Researchers at the Icahn School of Medicine at Mount Sinai have identified a protein that can be targeted to suppress growth of a common type of breast cancer known as "estrogen receptor positive" (ER+), including ER+ cancers that are resistant to standard treatments.

The protein, tyrosine kinase 6 (PTK6), is an enzyme molecule that is highly expressed in multiple tumor types, including prostate, ovarian, and breast cancers. It can promote cancer cell survival and growth of ER+ breast cancer cells. The study, titled "PTK6 regulates growth and survival of endocrine therapy-resistant ER+ breast cancer cells," was published in an online study today in NPJ Breast Cancer.

"Never before has PTK6 inhibition been shown to inhibit growth and induce cell death of ER+ breast cancer cells, including those resistant to standard treatments for this subtype such as tamoxifen," said Hanna Irie, MD, PhD, Assistant Professor of Medicine (Hematology and Medical Oncology) and Oncological Sciences at The Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, and senior author of the study. "We are excited and gratified by these remarkable results, which could lead to a new way to treat these drug resistant metastases of ER+ breast cancers and/or prevent their metastases in the first place."

According to Dr. Irie, the research is especially important because it supports the potential therapeutic value of targeting PTK6 in ER+ breast cancers, which constitute the most common subtype of breast cancer. Approximately 65 percent of all breast cancers express the estrogen receptor (ER +) and/or the progesterone receptor (PR+). One in eight women in the United States has a chance of being diagnosed with breast cancer and an estimated 250,000 new cases of invasive breast cancer are expected to be diagnosed in 2017.

Groundbreaking study identifies protein as potential factor in cancer metastasis
Standard treatments for ER+ breast cancer are endocrine therapies such as tamoxifen and aromatase inhibitors. "Endocrine therapies are still the most effective medical therapy for this subtype of breast cancer, and the end goal is to inhibit growth and/or kill ER+ breast cancer cells," said Dr. Irie. "However, some breast cancer patients still develop metastatic ER+ disease despite these common endocrine therapies, so newer treatments are very important and necessary to kill endocrine therapy-resistant cancers."

"This is a truly exciting discovery for the field of breast cancer," said Ramon Parsons, MD, PhD, Director of The Tisch Cancer Institute. "This breakthrough could lead to more effective therapies for women with this very common subtype of breast cancer and be the therapeutic target that the drug companies have been waiting for."

Source:
http://www.mountsinai.org/about-us/n...breast-cancer-
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Cathy

Diagnosed Oct. 2004 3 cm ductal, lumpectomy Nov. 2004
Diagnosed Jan. 2005 tumor in supraclavicular node
Stage 3c, Grade 3, ER/PR+, Her2++
4 AC, 4 Taxol, Radiation, Arimidex, Actonel
Herceptin for 9 months until Muga dropped and heart enlarged
Restarting herceptin weekly after 4 months off
Stopped herceptin after four weekly treatments....score dropped to 41
Finished 6 years Arimidex
May 2015 diagnosed with ovarian cancer
Stage 1C
started 6 treatments of carboplatin/taxol
Genetic testing show BRCA1 VUS
Nice! My hair came back really curly. Hope it lasts lol. Well it didn't but I liked it so I'm now a perm lady
29 March 2018 Lung biopsy following chest CT showing tumours in pleura of left lung, waiting for results to the question bc or ovarian
April 20, 2018 BC mets confirmed, ER/PR+ now Her2-
Questions about the possibility of ovarian spread and mets to bones so will be tested and monitored for these.
To begin new drug Palbociclib (Ibrance) along with Letrozole May, 2018.
Genetic testing of ovarian tumour and this new lung met will take months.
To see geneticist to be retested for BRCA this week....still BRCA VUS
CA125 has declined from 359 to 12 as of Aug.23/18


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Old 11-21-2017, 02:49 PM   #2
Laurel
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Re: New Therapeutic Target for ER+ BC

Yea! Good stuff there! Thanks for posting Cathy. They need more weapons in the arsenal for ER+ than Tamoxifen and A.I.s.
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Dx'd w/multifocal DCIS/IDS 3/08
7mm invasive component
Partial mast. 5/08
Stage 1b, ER 80%, PR 90%, HER-2 6.9 on FISH
0/5 nodes
4 AC, 4 TH finished 9/08
Herceptin every 3 weeks. Finished 7/09
Tamoxifen 10/08. Switched to Femara 8/09
Bilat SPM w/reconstruction 10/08
Clinical Trial w/Clondronate 12/08
Stopped Clondronate--too hard on my gizzard!
Switched back to Tamoxifen due to tendon pain from Femara

15 Years NED
I think I just might hang around awhile....

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Old 11-21-2017, 09:28 PM   #3
Carol Ann
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Re: New Therapeutic Target for ER+ BC

Great! Thanks for posting this!

Carol Ann
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July 24, 2013: "Infected" Right Nipple and benign cyst removed, pathology report revealed Paget's, DCIS, and ILC 1.25 cm, ER+/Pro+/HER2 equivocal, Grade 2 under benign cyst, previous diagnostic mammo/ultrasound said I was perfectly healthy in both breasts.

Aug 18, 2013: MRI report says Left breast is perfectly healthy "consistent with previous studies".

Sept 2013: I insist on a bilateral mastectomy anyway. Too nervewracking to let left breast remain with higher risk after 3 cancers in right, nipple in right is already gone anyhow.

Sept 18, 2013: Bilateral mastectomy, 11 right nodes removed, ALL negative BUT -- ER+/PRO+/HER2+ tumor, 1.0 cm, Grade 2 found in a piece of "grossly unremarkable" breast tissue from prophylactic mastectomy of left breast, no nodes removed.

Oct 25, 2013: 13 left side nodes removed, ALL negative, Stage 1 across the board, NO RADS needed, YAAAAY! Port also installed.

Nov 25, 2013 Begin 6 rounds TCH.

March 10, 2014 Just finished 6th and LAST Chemo today, YAAAAAY!

March 24, 2014 Echocardiogram to make sure I'm still good for Herceptin every 3 weeks.

March 31, 2014 Echo results NORMAL, first Herceptin all by itself. Now if only my eyes would stop streaming from the Taxotere ... :)

April 21, 2014 Started Arimidex and therapy for "mild" lymphedema in left hand and arm

May 2014 Therapy completed, I have sleeves and gloves for both arms, a Flexi touch lymph pump to hook up to for an hour every day, and I've become an arm bandaging expert. :)

June 2014 Begin Fosamax to prevent osteoporosis; bone scan revealed osteopenia

Nov 17, 2014 FINAL Herceptin!

Dec 4, 2014 My right thigh muscle has been extra achy for days ... I discover a blister rash cluster on the side of my right thigh while taking a shower. Port appointment cancelled until Dec 17, my doc is working me in tomorrow afternoon to see me and the rash. My muscle at least feels less achy.

Dec 5, 2014 Yep, I have shingles. Boo! I start acyclovir and also have a prescription for a painkiller just in case for over the weekend.

Dec 17, 2014 Port is OUT!

January 2016 Shingles again and this time it started where my left breast (where the hidden HER2+++ tumor was!) used to be. My onc nurse got me a same day appointment to see my doc when I called and told her I had a rash on the site. The antiviral meds are working once again, though, so that is good news. :)
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Old 11-22-2017, 09:25 AM   #4
jra40
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Re: New Therapeutic Target for ER+ BC

Wonderful news, thank you for posting!!
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11/17/10 - Diagnosed with 4.5cm tumor in right breast, IDC, Stage 2, Nuclear grade 2, ER+ PR+ HER2+
12/13/10 - Lymph node biopsy - negative
12/28/10 - Started neo-adjuvant treatment along with clinical trial with 4 rounds of AC chemo every 3 weeks
3/15/11 - Began weekly Taxol/Herceptin infusions along with 750mg of Tykerb taken by mouth daily
6/28/11 - Finished last cycle of Taxol
7/27/11 - Breast MRI shows tumor has dissolved, remarkable reaction to chemo
8/31/11 - Lumpectomy, Sentinel Node biopsy. Node negative, clear margins, 7mm of cancer left over from chemo.
10/05/11 - Started radiation, 5 days a week for 7 weeks.
11/8/11 - Finished radiation
3/21/12 - Last Herceptin!
3/26/12 - Port removed!
Tamoxifen for 5 years
8/4/15 - Hysterectomy & bilateral salpingo-oophorectomy. Due to large fibroids. No cancer!
8/8/15 - Started Arimidex
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