Ex vivo assessment of targeted therapies in a rare metastatic epithelial-myoepithelial carcinoma.

Abstract:

:Epithelial-myoepithelial carcinoma (EMC) is a rare subtype of salivary gland neoplasms. Since the initial description of the cancer, just over 300 cases have been reported. EMCs occupy a biphasic cellular differentiation-state defined by the constitution of two cell types representing epithelial and myoepithelial lineages, yet the functional consequence of the differentiation-state heterogeneity with respect to therapy resistance of the tumors remains unclear. The reported local recurrence rate of the cases is approximately 30%, and while distant metastases are rare, a significant fraction of these cases are reported to receive no survival benefit from radio- or chemotherapy given in addition to surgery. Moreover, no targeted therapies have been reported for these neoplasms. We report here the first use and application of ex vivo drug screening together with next generation sequencing to assess targeted treatment strategies for a rare metastatic epithelial-myoepithelial carcinoma. Results of the ex vivo drug screen demonstrate significant differential therapeutic sensitivity between the epithelial and myoepithelial intra-tumor cell lineages suggesting that differentiation-state heterogeneity within epithelial-myoepithelial carcinomas may present an outlet to partial therapeutic responses to targeted therapies including MEK and mTOR inhibitors. These results suggest that the intra-tumor lineage composition of EMC could be an important factor to be assessed when novel treatments are being evaluated for management of metastatic EMC.

journal_name

Neoplasia

authors

Mäkelä R,Arjonen A,Suryo Rahmanto A,Härmä V,Lehtiö J,Kuopio T,Helleday T,Sangfelt O,Kononen J,Rantala JK

doi

10.1016/j.neo.2020.06.007

subject

Has Abstract

pub_date

2020-09-01 00:00:00

pages

390-398

issue

9

eissn

1522-8002

issn

1476-5586

pii

S1476-5586(20)30129-9

journal_volume

22

pub_type

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