Showing posts with label BRCA 1. Show all posts
Showing posts with label BRCA 1. Show all posts

Sunday, February 24, 2013

NOMENCLATURE OF GENES TO LOOK FOR IN TRIPLE NEGATIVE BREAST CANCER

One may try to determine whether a breast cancer has bad prognosis in order to determine whether chemotherapy should be given (MammaPrint, Oncotypr DX), but more importantly, I believe, is to focus on genes of good prognosis which include driver genes against which we dispose of an answer in our Arsenal.
Currently we dispose of
1. Chemotherapy that attacks DNA and Microfilament/Microtubules,  (first and second law of nature)
2. Immune Modulators such as Interferon
3. Antibody to Membrane Receptor (EGFR/VEGF) Avastin
4.  Inhibitor to T-cell driven immunity (CTLA4)
5.  Inhibitors to sub-membrane or first line driver Mutations KRAS, HRAS, or the RAS family
6.  Inhibitors to 2nd line driver Mutations (anti MEK)
7. Inhibitor to Tertiary line driver Mutations and Mitochondrial level inhibition (MTOR, Metformin)
8. Anti-proteasome or inhibitor to cellular protein degradation (Velcade)
9. Inhibitors at Nuclear lever Include Histone Deacethylator and Acyl transferase inhibitor, check point controller inhibitors,  anti-Centrosome metabolism and inhibitors of various promoters and transcription factors.

Other opportunities not included in this classification go to specific genes of proliferation, Amplification, differentiation and metastasis that have been brought forth as indicator of either response to chemotherapy or simply as "Good prognosis" genes.  These will include the BRCA since a response to PARP inhibitors and Cisplatin based combinations should be anticipated.

Multikinase inhibitors such as Dasatinib (SRC+ BCR/ABL but also STAT5) and Arsenic Trioxide should be included   
LBK1: could predict early disease (inhibitor controlling initiation of metastasis)
DDR2: could predict anti MEK sensitivity
MEKK-1 sensitivity to Cisplatin
TFF1-could predict sensitivity to estrogen despite negative Estrogen
DYRK2, favorable in lung cancer
 
c-JUN amplification and over expression of 8q23-24 could predict  response to interferon/Interleukin
EGFR, VEGF, ALK,  and other Driver Mutations would match those discussed By DR Kris in lung cancer.

(to be continued!)

Wednesday, January 16, 2013

BRCA 1,2  
BR=Breast   CA=cancer
Tumor suppressor gene which encodes a protein regulator of transcription gene involved with cell proliferation (once again it is a regulator that is involved!)

1. Prophylactic Bilateral mastectomy reduces the short term risk of Breast cancer, and overall risk by 90%
2.Adding Bilateral Salpingo-Oophorectomy decreases risk of Breast and Ovarian cancer.
3.BRCA1 high grade and Hormone Receptor Negative, majority are basal like subtype  (but also more Atypia and Medullary histology found here!
4.whereas BRCA2 are more likely receptor positive and of luminal subtype
5. Risk of contralateral breast cancer in those with the disease 50-60%
6.BRCA 2 increases risk of Gastric,bilary,gallbladderand pancreatic cancer also.
7. The 2 HITS Theory assumes that the first hit is to have the abnormality but with the protecting presence of the normal BRCA gene.  The second (environment factor) Hit knock out the normal BRCA to unleash the effect of the abormal BRCA1-100
IF YOU HAVE IT
1-Abide by strict surveillance protocol
2-Bilateral protective Mastectomy
3. Bilateral protective Oophorectomy
4. participation in preventive research drug (Tamoxifen,Raloxifen)

and know about possibility of insurance issues that may arise
SEE A GENETIC COUNSELOR PRIOR TO TESTING!