# Genomic Analysis of Undifferentiated Carcinoma of the Pancreas with Squamous Differentiation: A Case Report

## TL;DR

This case report explores the genomic profile of a rare pancreatic cancer subtype with squamous features, revealing shared and unique mutations that may inform future treatment strategies.

## Contribution

The study presents a genomic analysis of a rare pancreatic undifferentiated carcinoma with squamous differentiation, highlighting chromatin remodeling gene mutations.

## Key findings

- Common mutations in KRAS and TP53 were found in both undifferentiated and squamous components of the tumor.
- The squamous component had specific mutations in SMARCA4 and SMARCB1 genes related to chromatin remodeling.
- The findings suggest a common origin for the tumor components and highlight the relevance of chromatin remodeling mutations in squamous differentiation.

## Abstract

Pancreatic cancer is an intractable malignancy associated with a dismal prognosis. Undifferentiated carcinoma, a rare subtype, poses a clinical challenge owing to a limited understanding of its molecular characteristics. In this study, we conducted genomic analysis specifically on a case of undifferentiated carcinoma of the pancreas exhibiting squamous differentiation.

An 80-year-old male, previously treated for colorectal cancer, presented with a mass with central cystic degeneration in the pancreatic tail. The mass was diagnosed pathologically as undifferentiated carcinoma of the pancreas with squamous differentiation. Despite surgical resection and chemotherapy, the patient faced early postoperative recurrence, emphasizing the aggressive nature of this malignancy.

Genomic analysis of distinct histologic components revealed some common mutations between undifferentiated and squamous components, including Kirsten rat sarcoma virus (KRAS) and TP53. Notably, the squamous component harbored some specific mutations in SMARCA4 and SMARCB1 genes that code for members of the SWItch/Sucrose Non-Fermentable (SWI/SNF) chromatin remodeling complex.

The common mutations in the undifferentiated and squamous cell carcinoma components from this analysis suggest that they originate from a common origin. The discussion also underscores the scarcity of genomic analyses on undifferentiated carcinoma of the pancreas, with existing literature pointing to SWI/SNF complex-related gene mutations. However, our case introduces chromatin remodeling factor mutations as relevant in squamous differentiation.

In conclusion, this study provides valuable insights into the genomic landscape of undifferentiated pancreatic carcinoma with squamous differentiation. These findings suggest the importance of further research and targeted therapies to improve the management of undifferentiated carcinoma of the pancreas and enhance patient outcomes.