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Immunohistochemical analysis of lung carcinomas with pure or partial bronchioloalveolar differentiation

Comparative Study

Affiliations

• ¹ Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, Calif 90095, USA.

• PMID: 15043468
• DOI: 10.5858/2004-128-406-IAOLCW

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Comparative Study

G Peter Sarantopoulos et al. Arch Pathol Lab Med. 2004 Apr.

• ¹ Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, Calif 90095, USA.

• PMID: 15043468
• DOI: 10.5858/2004-128-406-IAOLCW

Item in Clipboard

Context: In 1999, the World Health Organization redefined bronchioloalveolar carcinomas (BACs) as those neoplasms with only a pure lepidic growth pattern and no invasion.

Objectives: The present study examined 45 lung cancers with a BAC component (1) to determine whether these tumors would be classified as BACs by current World Health Organization standards, (2) to quantitate the BAC component within these tumors, and (3) to see if phenotypic differences exist between the so-called invasive and noninvasive regions of these tumors.

Design: Retrospective review of hematoxylin-eosin-stained slides and classification of histologic grade, tumor subtype, and percentage of pure BAC pattern, with further characterization by immunohistochemical staining for thyroid transcription factor 1, cytokeratin 7, cytokeratin 20, and Ki-67 antibodies.

Results: Only 7 (15.6%) of the 45 tumors examined could be classified as BAC by current strict World Health Organization criteria. Those tumors, classified as nonmucinous and mixed, showed similar immunohistochemical staining for cytokeratin 7, cytokeratin 20, and thyroid transcription factor 1; mucinous tumors showed disparate staining. Significant differences in immunohistochemical staining and tumor cell proliferation were seen for the regions of tumors designated as lepidic, infiltrative, and leading edge and for the regions of tumors with different histologic grades (ie, well, moderately, and poorly differentiated).

Conclusions: Nonmucinous and mixed BACs are phenotypically similar and show identical immunohistochemical staining patterns; mucinous tumors, on the other hand, show disparate immunohistochemical staining. Pulmonary neoplasms designated as adenocarcinomas with a BAC component represent a heterogenous group with a range of cell types, differentiation, growth, and immunophenotypes. Within an individual neoplasm, there are regional differences in these parameters as well.

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