PIN 4 Cocktail includes which components?

PIN 4 Cocktail includes which components?

• A. p63 (nuclear) and HMW-CK
• B. Prostatic adenocarcinoma only
• C. P504s- prostatic intraepithelial neoplasia - prostatic adenocarcinoma - cytoplasmic p63 (nuclear), and HMW-CK
• D. Cytokeratin 8/18 only

Answer: (C)

The main idea here is that the PIN4 Cocktail is a three-antibody panel used to reliably differentiate benign prostatic glands from carcinoma in challenging tissue samples. It combines AMACR (P504S) with basal-cell markers p63 and high-molecular-weight cytokeratin (HMW-CK, 34βE12). AMACR stains cytoplasm of neoplastic glands, including prostatic intraepithelial neoplasia and prostatic adenocarcinoma, while p63 and HMW-CK label the basal cell layer. Benign glands retain a continuous basal cell layer that is positive for both p63 (nuclear) and HMW-CK, and are typically AMACR-negative or weak. Carcinoma usually lacks this basal layer (p63 and HMW-CK negative) but shows AMACR positivity. Thus the combination of P504S (AMACR) with p63 and HMW-CK in one cocktail specifically helps identify malignant glands and distinguish them from benign glands or PIN.

The main idea here is that the PIN4 Cocktail is a three-antibody panel used to reliably differentiate benign prostatic glands from carcinoma in challenging tissue samples. It combines AMACR (P504S) with basal-cell markers p63 and high-molecular-weight cytokeratin (HMW-CK, 34βE12). AMACR stains cytoplasm of neoplastic glands, including prostatic intraepithelial neoplasia and prostatic adenocarcinoma, while p63 and HMW-CK label the basal cell layer. Benign glands retain a continuous basal cell layer that is positive for both p63 (nuclear) and HMW-CK, and are typically AMACR-negative or weak. Carcinoma usually lacks this basal layer (p63 and HMW-CK negative) but shows AMACR positivity. Thus the combination of P504S (AMACR) with p63 and HMW-CK in one cocktail specifically helps identify malignant glands and distinguish them from benign glands or PIN.