What is AMACR stain?
Alpha-methylacyl-CoA-racemase (AMACR) is a recently discovered tumor marker whose expression is significantly upregulated in prostate cancer.
What is AMACR deficiency?
Collapse Section. Alpha-methylacyl-CoA racemase (AMACR) deficiency is a disorder that causes a variety of neurological problems that begin in adulthood and slowly get worse. People with AMACR deficiency may have a gradual loss in intellectual functioning (cognitive decline), seizures, and migraines.
What is Racemase staining?
Positive racemase staining converts an atypical diagnosis, based on suspicious histology and negative basal cell marker stains, to cancer in approximately 10% of cases thought to be atypical by contributing pathologists, and in approximately 50% of cases thought to be atypical by a specialist in genitourinary pathology …
What does P504S positive mean?
Expression of P504S was not found in basal cell hyperplasia, urothelial cells/metaplasia and small atrophic glands that may mimic prostate carcinoma. Our findings indicate that P504S is a highly sensitive and specific positive marker for prostate carcinoma.
What is Hmwck?
In recent period, basal cell markers high molecular weight cytokeratin (HMWCK), P63 and prostate biomarker AMACR have been used as adjuvant to morphology in diagnostically challenging cases with a very high sensitivity and specificity.
What is an Racemase prostate?
Alpha-methylacyl-CoA racemase (AMACR) is a mitochondrial and peroxisomal enzyme that is overexpressed in prostate cancer. The aim of this study was to confirm and expand the findings that the PCa risk increased in men associated with AMACR expression across various geographic regions.
What is atypical small acinar proliferation?
This is referred to as atypical small acinar proliferation (ASAP). ASAP, which is defined as a “focus of small acinar structures formed by atypical epithelial cells,” is a condition in which the pathologist has insufficient data to make a diagnosis and thus raises the suspicion of cancer.
What is p63 in immunohistochemistry?
Tumor protein 63 (p63) is a transcription factor of the p53 gene family involved in differentiation of several tissues including squamous epithelium. p63 immunohistochemistry is broadly used for tumor classification but published data on its expression in cancer is conflicting.
What is pin prostate?
Prostatic intraepithelial neoplasia (PIN) is a condition “defined by neoplastic growth of epithelial cells within preexisting benign prostatic acini or ducts.”3 Because PIN satisfies almost all the requirements for a premalignant condition, high-grade PIN (HGPIN) is widely accepted as a precursor to prostate cancer.
What is acinar proliferation in prostate?
Background: Atypical small acinar proliferation (ASAP) occurs in approximately 5% of prostate biopsies. Approximately 30-40% of patients with ASAP may develop prostate cancer (PCa) within a 5-year period. Current guidelines recommend a repeat biopsy within 3-6 months after the initial diagnosis.
What does atypical cells mean on a prostate biopsy?
Abstract. Atypical small acinar proliferation is a histopathological diagnosis of unspecified importance in prostate needle-biopsy reports, suggestive but not definitive for cancer.
What is a positive p63?
P63: scored positive when high intensity staining was present on ≥50% of tumor cells; the remainder was scored negative [10]. TTF-1: scored positive when staining was present on ≥5% of tumor cells; the remainder was scored negative [11].
What is GATA3 positive?
A recent study found GATA-3 to be associated with favorable breast cancer pathologic features, including negative lymph node and positive estrogen receptor (ER) status. GATA-3 levels were also found to be an independent prognostic marker, with low expression predicting for breast cancer recurrence.
What is precancerous prostate?
Precancerous conditions of the prostate are those that have the potential to cause cancer. Precancerous tissues contain cells with abnormalities that have arisen from DNA mutation. Sometimes, these abnormal cells proliferate and cancer develops.
What does acinar proliferation mean?
Can amacr/p504s stain be used as an adjunctive stain?
Although it has limitations with respect to sensitivity and specificity, AMACR/P504S will no doubt become a standard adjunctive stain used by pathologists seeking to reach a definitive diagnosis in prostate biopsies considered to be atypical, but not diagnostic of malignancy on haematoxylin and eosin sections alone.
Is amethylacyl CoA racemase a potential prostatic adenocarcinoma specific marker in prostate cancer?
Amethylacyl CoA racemase (AMACR), a new potential prostatic adenocarcinoma specific marker, has been reported to have sensitivity ranging from 82% to 100% respectively.[11,12,13,14,15,16] The present study is carried out with the aim to evaluate the expression of AMACR in prostate cancer and its correlation with Gleason grade. Materials and Methods
Can amacr/p504s be used to identify prostate cancer in biopsies?
AMACR/P504S overexpression is not unique to prostate cancer. As such, this marker cannot be used to identify prostate cancer in biopsies containing metastatic adenocarcinoma of unknown primary site.