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Re: Genotyping errors plague CYP2D6 testing for tamoxifen therapy
I first read this a few days ago, and my jaw dropped straight to the floor.
What were they thinking?
I had huge concerns about CYP2D6 because my genotyping results indicate I'm likely an intermediate metabolizer. Those concerns were discounted by both oncs, because the testing is unreliable. Now it turns out the testers were unreliable.
Why they looked at tumor tissue for Cytochrome P50 genes boggles the mind.
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2/6/09 Core needle biopsy: negative; Mammos through 2010: no change
3/30/11 Pea-sized lump in left breast at site of prior biopsy; mammo negative, sonogram not so much
4/14/11 Core needle biopsy: negative for cancer
5/18/11 Excisional biopsy 1.2 cm tumor, LVI, positive margin; ER+60%,PR+20%,HER2/CEP17 5
6/15/11 BMX: Left DCIS & LH; Right ADH; SNB: 2/3 nodes: 1.4 cm and 1 mm; ALND L1&2: 0/10; Stage IIa, Grade 3
7/14/11 CT/Bone scans NED; MUGA 66%
7/19/11 Biweekly dd AC w/Neulasta; done 8/30/11
9/13/11 Transfusion (Hemoglobin 8.6); MUGA 64%
9/20/11 Start Taxol + Herceptin; Taxol done 12/6/2011; continue Herceptin until 9/4/2012
12/27/11 Radiation - 6 weeks; 2/27/2012 - DONE! Yayyyy!
2/29/12 Start Tamoxifen 20 mg/day; continue until 2/28/17
5/16/12 Start five-years Metformin trial
6/19/12 MUGA 61%
8/21/12 Brain MRI NED (head still hurts, brain still fogged)
9/4/12 Herceptin done!
9/6/12 Port out!
7/11/13 Aricept 5mg for cognitive impairment; increased to 10mg as of 8/23/13; back to 5mg 12/2013
5/2014 Add Namenda 7mg
9/2014 Stop Aricept and Namenda; Neuropsychological evaluation
10/24/14 Start cognitive rehabilitation therapy
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