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. 2001 Apr;54(4):257–271. doi: 10.1136/jcp.54.4.257

Pulmonary preinvasive neoplasia

K Kerr 1
PMCID: PMC1731391  PMID: 11304841

Abstract

Advances in molecular biology have increased our knowledge of the biology of preneoplastic lesions in the human lung. The recently published WHO lung tumour classification defines three separate lesions that are regarded as preinvasive neoplasia. These are (1) squamous dysplasia and carcinoma in situ (SD/CIS), (2) atypical adenomatous hyperplasia (AAH), and (3) diffuse idiopathic pulmonary neuroendocrine cell hyperplasia (DIPNECH). SD/CIS is graded in four stages (mild, moderate, severe, and CIS), based upon the distribution of atypical cells and mitotic figures. Most airways showing SD/CIS demonstrate a range of grades; many epithelia are hard to assess and the reproducibility of this complex system remains to be established. Detailed criteria are, however, welcome and provide an objective framework on which to compare various molecular changes. Alterations in gene expression and chromosome structure known to be associated with malignant transformation can be demonstrated in CIS, less so in dysplasias, but also in morphologically normal epithelium. The changes might be sequential, and their frequency and number increase with atypia. Less is known of the "risk of progression" of SD/CIS to invasive "central" bronchial carcinoma. It may take between one and 10 years for invasion to occur, yet the lesion(s) may be reversible if carcinogen exposure ceases.

AAH may be an important precursor lesion for peripheral "parenchymal" adenocarcinoma of the lung: the "adenoma" in an adenoma–carcinoma sequence. There is good morphological evidence that AAH may progress from low to high grade to bronchioloalveolar carcinoma (BAC; a non-invasive lesion by definition). Invasion then develops within BAC and peripheral lung adenocarcinoma evolves. The molecular events associated with this progression are not well understood and studies are hampered by a lack of clear criteria to distinguish high grade AAH from BAC. Nonetheless, as with SD/CIS, the patterns of expression of tumour associated genes are consistent with neoplastic progression. We have little idea of the incidence of AAH in the normal or "smoking" populations. It is found more frequently in cancer bearing lungs, especially in those with adenocarcinoma, and is more common in women. No data are available on the risk of progression of AAH. DIPNECH is an exceptionally rare lesion associated with the development of multiple carcinoid tumours. Almost nothing is known of its biology.

Knowledge of these lesions will be crucial in the design and understanding of lung cancer screening programmes, where it is likely that the morphological and, more importantly perhaps, the molecular characteristics of these lesions will provide useful targets for detection and possibly even treatment.

Key Words: lung cancer • preneoplasia • carcinogenesis

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Figure 1 A diagrammatic summary of the WHO criteria13 for bronchial squamous dysplasia/carcinoma in situ (CIS). The distribution of various features is related to the lower, middle, and upper thirds of the multilayered "squamous" epithelium.

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Figure 2 (A) Mild dysplasia: basal zone crowding and minimal cytological atypia. (B) Moderate dysplasia: vertically orientated nuclei occupy the lower two thirds of the epithelium whereas maturation is still clearly visible towards the surface. (C) Severe dysplasia: greater cytological aberration, mitoses are clearly present in the lower two thirds of the epithelium, and there is virtually no maturation. Note the sharp transition from normal respiratory epithelium on the left.

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Figure 3 Carcinoma in situ. Full thickness severe cytological atypia with a chaotic appearance.

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Figure 4 (A) Ciliated respiratory epithelial cells overlying a population showing clear squamous differentiation (intercellular bridges) and prominent vertical orientation of nuclei (moderate dysplasia?) (B) Apart from the persisting superficial ciliated cells, this could be regarded as carcinoma in situ.

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Figure 5 (A) A 4 mm diameter focus of atypical adenomatous hyperplasia (AAH) easily visible on the lung cut surface as a result of abundant collagen in the alveolar walls. (B) AAH lesions are often found in the centriacinar zone, near respiratory bronchioles.

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Figure 6 Atypical adenomatous hyperplasia. Low grade lesions show (A) intermittent or (B) complete runs of cuboidal cells lining slightly thickened alveolar walls. More cellular lesions (C) may be larger and have columnar Clara-like cells. Less often, lesions are very cellular, more atypical (D), and very difficult to distinguish from bronchioloalveolar cell carcinoma.

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Figure 7 (A) This 1.7 cm lesion with a rather solid and cystic centre has alveolar spaces clearly visible in the periphery. (B) Whole mount of the same lesion. Closer examination (C) shows a periphery typical of atypical adenomatous hyperplasia but the central, solid zone shows (D) papillary bronchioloalveolar-like areas and clear evidence of stromal invasion (arrows).

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Figure 8 A hyperplastic focus of neuroendocrine cells in the airway epithelium, found in the same lobe as an atypical carcinoid tumour (immunoperoxidase with anti-chromogranin).

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