Basal cell carcinosarcoma with PTCH1 mutations in both epithelial and sarcomatoid primary tumor components and in the sarcomatoid metastasis

Maija Ht Kiuru, Gregory McDermott, Daniel C. Coit, Michael F. Berger, Klaus J. Busam

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Basal cell carcinosarcoma is a rare biphenotypic malignant skin tumor, in which one tumor component has light microscopic features of basal cell carcinoma, whereas the other has features of sarcoma. Clinical experience with this tumor is limited, and associated molecular genetic alterations are unknown. Herein, we report a unique case of metastatic basal cell carcinosarcoma, in which we analyzed the 2 components of the primary tumor as well as the metastasis by next-generation sequencing. The patient was a 72-year-old man who presented with a 7-year history of a large tumor of the left forearm. The tumor showed mixed features of basal cell carcinoma and undifferentiated sarcoma. The patient underwent a wide local excision and sentinel lymph node biopsy, which revealed microscopic subcapsular deposits of metastatic sarcomatoid tumor. One year later, intra-abdominal metastatic tumor was detected and resected. It had sarcomatoid features by light microscopy and failed to stain for epithelial markers by immunohistochemistry. DNA was extracted separately from the epithelial and sarcomatoid component of the primary tumor, intra-abdominal metastasis, and normal tissue. All exons of 230 cancer-associated genes were sequenced to an average read depth of >500-fold. This revealed multiple identical mutations in epithelial and sarcomatoid tumor compartments. Both compartments harbored 2 identical mutations, a truncating and a missense mutation, in the patched gene (PTCH1). This finding is not only of interest for a shared heritage of different subpopulations in a biphenotypic tumor, but also relevant clinically. It provides a rationale for the clinical use of hedgehog pathway inhibitors for treatment of patients affected by this tumor. Unfortunately, the patient reported herein died of metastatic disease before targeted therapy could be initiated.

Original languageEnglish (US)
Pages (from-to)138-142
Number of pages5
JournalAmerican Journal of Surgical Pathology
Volume38
Issue number1
DOIs
StatePublished - Jan 2014
Externally publishedYes

Fingerprint

Carcinosarcoma
Neoplasm Metastasis
Mutation
Neoplasms
Basal Cell Carcinoma
Sarcoma
Light
Sentinel Lymph Node Biopsy
Neoplasm Genes
Missense Mutation
Forearm
Molecular Biology
Microscopy
Exons

Keywords

  • basal cell carcinoma
  • carcinosarcoma
  • patch mutations
  • sequencing

ASJC Scopus subject areas

  • Anatomy
  • Pathology and Forensic Medicine
  • Surgery

Cite this

Basal cell carcinosarcoma with PTCH1 mutations in both epithelial and sarcomatoid primary tumor components and in the sarcomatoid metastasis. / Kiuru, Maija Ht; McDermott, Gregory; Coit, Daniel C.; Berger, Michael F.; Busam, Klaus J.

In: American Journal of Surgical Pathology, Vol. 38, No. 1, 01.2014, p. 138-142.

Research output: Contribution to journalArticle

@article{dc9b59b25d8645bfb50879af00194810,
title = "Basal cell carcinosarcoma with PTCH1 mutations in both epithelial and sarcomatoid primary tumor components and in the sarcomatoid metastasis",
abstract = "Basal cell carcinosarcoma is a rare biphenotypic malignant skin tumor, in which one tumor component has light microscopic features of basal cell carcinoma, whereas the other has features of sarcoma. Clinical experience with this tumor is limited, and associated molecular genetic alterations are unknown. Herein, we report a unique case of metastatic basal cell carcinosarcoma, in which we analyzed the 2 components of the primary tumor as well as the metastasis by next-generation sequencing. The patient was a 72-year-old man who presented with a 7-year history of a large tumor of the left forearm. The tumor showed mixed features of basal cell carcinoma and undifferentiated sarcoma. The patient underwent a wide local excision and sentinel lymph node biopsy, which revealed microscopic subcapsular deposits of metastatic sarcomatoid tumor. One year later, intra-abdominal metastatic tumor was detected and resected. It had sarcomatoid features by light microscopy and failed to stain for epithelial markers by immunohistochemistry. DNA was extracted separately from the epithelial and sarcomatoid component of the primary tumor, intra-abdominal metastasis, and normal tissue. All exons of 230 cancer-associated genes were sequenced to an average read depth of >500-fold. This revealed multiple identical mutations in epithelial and sarcomatoid tumor compartments. Both compartments harbored 2 identical mutations, a truncating and a missense mutation, in the patched gene (PTCH1). This finding is not only of interest for a shared heritage of different subpopulations in a biphenotypic tumor, but also relevant clinically. It provides a rationale for the clinical use of hedgehog pathway inhibitors for treatment of patients affected by this tumor. Unfortunately, the patient reported herein died of metastatic disease before targeted therapy could be initiated.",
keywords = "basal cell carcinoma, carcinosarcoma, patch mutations, sequencing",
author = "Kiuru, {Maija Ht} and Gregory McDermott and Coit, {Daniel C.} and Berger, {Michael F.} and Busam, {Klaus J.}",
year = "2014",
month = "1",
doi = "10.1097/PAS.0000000000000101",
language = "English (US)",
volume = "38",
pages = "138--142",
journal = "American Journal of Surgical Pathology",
issn = "0147-5185",
publisher = "Lippincott Williams and Wilkins",
number = "1",

}

TY - JOUR

T1 - Basal cell carcinosarcoma with PTCH1 mutations in both epithelial and sarcomatoid primary tumor components and in the sarcomatoid metastasis

AU - Kiuru, Maija Ht

AU - McDermott, Gregory

AU - Coit, Daniel C.

AU - Berger, Michael F.

AU - Busam, Klaus J.

PY - 2014/1

Y1 - 2014/1

N2 - Basal cell carcinosarcoma is a rare biphenotypic malignant skin tumor, in which one tumor component has light microscopic features of basal cell carcinoma, whereas the other has features of sarcoma. Clinical experience with this tumor is limited, and associated molecular genetic alterations are unknown. Herein, we report a unique case of metastatic basal cell carcinosarcoma, in which we analyzed the 2 components of the primary tumor as well as the metastasis by next-generation sequencing. The patient was a 72-year-old man who presented with a 7-year history of a large tumor of the left forearm. The tumor showed mixed features of basal cell carcinoma and undifferentiated sarcoma. The patient underwent a wide local excision and sentinel lymph node biopsy, which revealed microscopic subcapsular deposits of metastatic sarcomatoid tumor. One year later, intra-abdominal metastatic tumor was detected and resected. It had sarcomatoid features by light microscopy and failed to stain for epithelial markers by immunohistochemistry. DNA was extracted separately from the epithelial and sarcomatoid component of the primary tumor, intra-abdominal metastasis, and normal tissue. All exons of 230 cancer-associated genes were sequenced to an average read depth of >500-fold. This revealed multiple identical mutations in epithelial and sarcomatoid tumor compartments. Both compartments harbored 2 identical mutations, a truncating and a missense mutation, in the patched gene (PTCH1). This finding is not only of interest for a shared heritage of different subpopulations in a biphenotypic tumor, but also relevant clinically. It provides a rationale for the clinical use of hedgehog pathway inhibitors for treatment of patients affected by this tumor. Unfortunately, the patient reported herein died of metastatic disease before targeted therapy could be initiated.

AB - Basal cell carcinosarcoma is a rare biphenotypic malignant skin tumor, in which one tumor component has light microscopic features of basal cell carcinoma, whereas the other has features of sarcoma. Clinical experience with this tumor is limited, and associated molecular genetic alterations are unknown. Herein, we report a unique case of metastatic basal cell carcinosarcoma, in which we analyzed the 2 components of the primary tumor as well as the metastasis by next-generation sequencing. The patient was a 72-year-old man who presented with a 7-year history of a large tumor of the left forearm. The tumor showed mixed features of basal cell carcinoma and undifferentiated sarcoma. The patient underwent a wide local excision and sentinel lymph node biopsy, which revealed microscopic subcapsular deposits of metastatic sarcomatoid tumor. One year later, intra-abdominal metastatic tumor was detected and resected. It had sarcomatoid features by light microscopy and failed to stain for epithelial markers by immunohistochemistry. DNA was extracted separately from the epithelial and sarcomatoid component of the primary tumor, intra-abdominal metastasis, and normal tissue. All exons of 230 cancer-associated genes were sequenced to an average read depth of >500-fold. This revealed multiple identical mutations in epithelial and sarcomatoid tumor compartments. Both compartments harbored 2 identical mutations, a truncating and a missense mutation, in the patched gene (PTCH1). This finding is not only of interest for a shared heritage of different subpopulations in a biphenotypic tumor, but also relevant clinically. It provides a rationale for the clinical use of hedgehog pathway inhibitors for treatment of patients affected by this tumor. Unfortunately, the patient reported herein died of metastatic disease before targeted therapy could be initiated.

KW - basal cell carcinoma

KW - carcinosarcoma

KW - patch mutations

KW - sequencing

UR - http://www.scopus.com/inward/record.url?scp=84891614445&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84891614445&partnerID=8YFLogxK

U2 - 10.1097/PAS.0000000000000101

DO - 10.1097/PAS.0000000000000101

M3 - Article

C2 - 24335643

AN - SCOPUS:84891614445

VL - 38

SP - 138

EP - 142

JO - American Journal of Surgical Pathology

JF - American Journal of Surgical Pathology

SN - 0147-5185

IS - 1

ER -