What does Napsin a positive mean?

Background. Napsin A and thyroid transcription factor-1 (TTF-1) are known to be useful immunohistochemical markers to distinguish primary lung cancers from metastatic lung tumors. These markers are usually positive in primary lung adenocarcinomas but not metastatic adenocarcinomas in other organs.

What is Napsin?

Napsin A (Nap-A) is a functional aspartic proteinase that may be an alternative marker for primary lung ACA. Objectives: To compare Nap-A versus TTF-1 in the typing of primary lung carcinoma and the differentiation of primary lung ACA from carcinomas of other sites.

What does TTF-1 positive mean?

TTF-1 plays a key role in morphogenesis of the lungs[1] and is expressed in up to 90% of pulmonary small cell carcinoma[2]. This explains why this marker is frequently used to search for the primary origin of metastatic neuroendocrine tumours.

What is TTF-1 and Napsin A?

TTF-1 has been the premier marker for lung adenocarcinoma. A new and promising marker, Napsin A, is expressed in type II pneumocytes and in adenocarcinomas of the lung (2). Studies have shown Napsin A to be more sensitive and specific than TTF-1 in lung adenocarcinomas and virtually negative in all squamous carcinomas.

What is Napsin a negative?

As shown in Table I, napsin A expression was positive in 84.9% of the lung adenocarcinomas, and 87.5% in the glandular component of adenosquamous cell carcinomas, but negative in other types of primary lung cancer and metastatic lung cancer cases. Napsin A had a high specificity of 93.8% to lung adenocarcinomas.

What does CDX2 positive mean?

These results suggest that positive CDX2 staining represents a highly sensitive and specific marker of metastatic colorectal carcinoma in both biopsy and resected specimens, and is superior to staining for the CK7-/20+ phenotype.

What is a Napsin test?

Napsin A has clinical utility for the identification of primary lung adenocarcinomas. Napsin A is also positive in a subset of thyroid and renal cell carcinomas (especially papillary type).

Is TTF 1 positive good or bad?

In this study, we demonstrated that TTF-1 expression was a good prognostic indicator for OS and PFS in patients with stage IV lung adenocarcinoma regardless of the presence or absence of EGFR mutations. We also confirmed that TTF-1 positivity was strongly correlated with EGFR mutations.

What does TTF 1 negative mean?

Background: Patients with thyroid transcription factor 1 (TTF1) negative lung adenocarcinoma (ADC) have been reported to have a worse prognosis and to lack epidermal growth factor receptor (EGFR) mutations. This study describes a series of sample tumors from patients with clinically confirmed lung cancer.

Is Napsin a cytoplasmic staining?

Napsin A has also been useful in cases where the tumor is diffusely positive for both TTF1 and p63. Interpretation of napsin A is relatively difficult because it is a cytoplasmic stain, and weak staining of macrophages within the tumor may cause difficulties in interpretation.

What does p63 positive mean?

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 does CDX2 negative mean?

CDX2-negative tumors are often associated with an increased likelihood of aggressive features, including advanced stage, poor differentiation, and vascular invasion and BRAF mutation.

What is napsin (Pernick N)?

Cite this page: Pernick N. Napsin A. PathologyOutlines.com website. Accessed September 2nd, 2021. A novel aspartic proteinase of the pepsin family involved in the maturation of surfactant protein B

What is sinusoidal invasion of the adrenal gland?

Sinusoidal invasion (sinusoid is endothelial lined vessel in adrenal gland with little supportive tissue; consider only sinusoids within tumor) Capsular invasion (nests or cords of tumor extending into or through capsule with a stromal reaction); either incomplete or complete

What are the different types of adrenal tumors?

1 Adrenal cortical adenoma: see Modified Weiss criteria above 2 Adrenal medullary tumors: inhibin-, MelanA-, calretinin- and chromogranin+ 3 Hepatocellular carcinoma 4 Renal cell carcinoma: usually contains glands which may contain red blood cells, glycogen+, keratin+, EMA+, CD10+,… More