Adenocarcinoma of the lung

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Adenocarcinoma of the lung
Diagnosis in short

Lung adenocarcinoma, mucinous. H&E stain.
LM nuclear atypia, eccentrically placed nuclei, usu. abundant cytoplasm (classically with mucin vacuoles), often conspicuous nucleoli, +/-nuclear pseudoinclusions
IHC CK7 +ve, TTF-1 +ve, CK20 -ve, p40 -ve, p63 -ve (usually)
Molecular +/-EGFR mutations, +/-ALK chromosomal translocation (inv(2)(p21p23) -- EML4-ALK fusion)
Site lung - see lung tumours
Prevalence most common primary lung tumour
Radiology lung mass - typically peripheral lesion (distant from large airways), may be multifocal
Prognosis moderate
Clin. DDx other lung tumours - primary and metastatic
Treatment surgical resection if feasible

Adenocarcinoma of the lung, also lung adenocarcinoma, is common malignant lung tumour.

General

Treatment:

  • Lung adenocarcinoma may be treated with EGFR inhibitors (e.g. gefitinib (Iressa), erlotinib (Tarceva)).[1]

Patients that receive EGFR inhibitors classically are:[2]

  • Non-smokers.
  • Female.
  • Asian.
    • Caucasians also benefit.[3]

Gross

  • Classically peripheral lesions.
  • May be multifocal.

Microscopic

Features:

Negatives:

  • Lack of intercellular bridges.

Patterns:[4]

  • Lepidic - tumour grows long the alveolar wall; means scaly covering.[5]
  • Acinar - berry-shaped glands.
  • Papillary - fibrovascular cores.
  • Micropapillary - nipple shaped projections without fibrovascular cores.
  • Solid - sheet of cells.

Notes:

  • Lymphovascular invasion is common.
  • Micropapillary predominant pattern and tumours with any amount of the lepidic pattern are associated with EGFR mutations.[6]

DDx:

Images

  • BAC - mucinous type - low mag. (WC/Yale Rosen)

  • BAC - mucinous type - high mag. (WC/Yale Rosen)

www:

Classification

Classification based on extent:[4]

  1. Adenocarcinoma in situ (AIS) - previously known as BAC.
    • Subtypes: nonmucinous, mucinous, mixed mucinous/nonmucinous.
  2. Minimally invasive adenocarcinoma (MIA).
    • Lepidic growth with up to 5 mm of invasion.
    • Subtypes: nonmucinous (most common), mucinous, mixed mucinous/nonmucinous.
  3. Invasive adenocarcinoma:
    • Subtypes: micropapillary, mucinous (previously mucinous BAC), colloid, fetal, enteric.

IHC

Primary versus metastatic:

  • CK7 +ve.
  • TTF-1 +ve.
  • CK20 -ve.

Adenocarcinoma versus SCC:

  • TTF-1 +ve.
  • p40 -ve.[8]
  • p63 -ve -- occasionally +ve.

Molecular

  • EGFR mutations (typically assessed by PCR) - respond to TKIs (e.g. gefitinib, erlotinib) if:[9]
    • Exon 19 deletion.
    • Exon 21 L858R.
      • Natural history of mutation is suspected to have a better prognosis vs. wild-type.[10]
    • KRAS mutations are absent, i.e. wild-type KRAS.[11]

Sign out

Biopsy

LUNG, LEFT, BIOPSY:
- ADENOCARCINOMA, LEPIDIC GROWTH; INVASION CANNOT BE EXCLUDED IN THIS SMALL SPECIMEN.

Resection

LUNG, LEFT UPPER LOBE, LOBECTOMY:
- ADENOCARCINOMA WITH AN ACINAR PATTERN, SOLID PATTERN, MICROPAPILLARY PATTERN 
  AND LEPIDIC PATTERN -- PATTERNS IN ORDER OF PREVALENCE.
- MARGINS NEGATIVE FOR MALIGNANCY.
- THREE LYMPH NODES NEGATIVE FOR MALIGNANCY (3 POSITIVE/4).
- PLEASE SEE TUMOUR SUMMARY.

LUNG, RIGHT UPPER LOBE, LOBECTOMY:
- MULTIPLE ADENOCARCINOMAS (x2) WITH AN ACINAR PATTERN, SOLID PATTERN, MICROPAPILLARY PATTERN 
  AND LEPIDIC PATTERN -- PATTERNS IN ORDER OF PREVALENCE.
- MARGINS NEGATIVE FOR MALIGNANCY.
- FOUR LYMPH NODES NEGATIVE FOR MALIGNANCY (0 POSITIVE/4).
- LYMPHOVASCULAR INVASION PRESENT.
- PLEASE SEE TUMOUR SUMMARY AND COMMENT.

COMMENT:
The histology of the two adenocarcinomas resemble one another and lymphovascular
invasion is present.  These findings favour that the smaller tumor is a metastasis, rather
than a synchronous primary.

Micro

Adequacy: scant tissue (<0.5 cm).
Gland formation: focal, poorly formed.
Cell size: large.
Cytoplasm: moderate-to-abundant, grey-eosinophilic.
Nucleus location: eccentric.
Nuclear pleomorphism: moderate.
Nuclear moulding: absent.
Nucleoli: present, prominent.
Nuclear pseudoinclusions: present.

Number of cores: 3.
Length of cores (total): 2.0 cm.

Gland formation: present.
Cell size: large.
Cytoplasm: moderate, grey-eosinophilic.
Necrosis: none apparent.
Mucin: none.

Nucleus location: eccentric.
Nuclear pleomorphism: moderate.
Nuclear moulding: absent.
Nuclear pseudoinclusions: absent.
Nuclear shape/arrangment: cigar-like/pseudostratified.
Nucleoli: present.

Staging note

  • Two small tumours in one lobe is pT3.
  • Visceral pleural involvement upgrades small tumours.

See also

References

  1. ↑ Sun Y, Ren Y, Fang Z, et al. (October 2010). "Lung adenocarcinoma from East Asian never-smokers is a disease largely defined by targetable oncogenic mutant kinases". J. Clin. Oncol. 28 (30): 4616–20. doi:10.1200/JCO.2010.29.6038. PMID 20855837.
  2. ↑ Job B, Bernheim A, Beau-Faller M, et al. (2010). "Genomic Aberrations in Lung Adenocarcinoma in Never Smokers". PLoS One 5 (12): e15145. doi:10.1371/journal.pone.0015145. PMC 2997777. PMID 21151896. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2997777/.
  3. ↑ Rosell, R.; Moran, T.; Cardenal, F.; Porta, R.; Viteri, S.; Molina, MA.; Benlloch, S.; Taron, M. (Oct 2010). "Predictive biomarkers in the management of EGFR mutant lung cancer.". Ann N Y Acad Sci 1210: 45-52. doi:10.1111/j.1749-6632.2010.05775.x. PMID 20973798.
  4. ↑ 4.0 4.1 Travis WD, Brambilla E, Noguchi M, et al. (February 2011). "International association for the study of lung cancer/american thoracic society/european respiratory society international multidisciplinary classification of lung adenocarcinoma". J Thorac Oncol 6 (2): 244–85. doi:10.1097/JTO.0b013e318206a221. PMID 21252716.
  5. ↑ URL: http://medical-dictionary.thefreedictionary.com/lepidic. Accessed on: 8 August 2013.
  6. ↑ Shim, HS.; Lee, da H.; Park, EJ.; Kim, SH. (Oct 2011). "Histopathologic characteristics of lung adenocarcinomas with epidermal growth factor receptor mutations in the International Association for the Study of Lung Cancer/American Thoracic Society/European Respiratory Society lung adenocarcinoma classification.". Arch Pathol Lab Med 135 (10): 1329-34. doi:10.5858/arpa.2010-0493-OA. PMID 21970488.
  7. ↑ URL: http://cancergrace.org/lung/2007/05/14/bac-mucinous-and-non-mucinous/. Accessed on: 8 August 2013.
  8. ↑ Bishop, JA.; Teruya-Feldstein, J.; Westra, WH.; Pelosi, G.; Travis, WD.; Rekhtman, N. (Mar 2012). "p40 (ΔNp63) is superior to p63 for the diagnosis of pulmonary squamous cell carcinoma.". Mod Pathol 25 (3): 405-15. doi:10.1038/modpathol.2011.173. PMID 22056955.
  9. ↑ John, T.; Liu, G.; Tsao, MS. (Aug 2009). "Overview of molecular testing in non-small-cell lung cancer: mutational analysis, gene copy number, protein expression and other biomarkers of EGFR for the prediction of response to tyrosine kinase inhibitors.". Oncogene 28 Suppl 1: S14-23. doi:10.1038/onc.2009.197. PMID 19680292.
  10. ↑ URL: http://www.mycancergenome.org/mutation.php?dz=nsclc&gene=egfr&code=l858r. Accessed on: 27 April 2012.
  11. ↑ Pao, W.; Wang, TY.; Riely, GJ.; Miller, VA.; Pan, Q.; Ladanyi, M.; Zakowski, MF.; Heelan, RT. et al. (Jan 2005). "KRAS mutations and primary resistance of lung adenocarcinomas to gefitinib or erlotinib.". PLoS Med 2 (1): e17. doi:10.1371/journal.pmed.0020017. PMID 15696205.
  12. ↑ Li, Y.; Ye, X.; Liu, J.; Zha, J.; Pei, L. (Jan 2011). "Evaluation of EML4-ALK fusion proteins in non-small cell lung cancer using small molecule inhibitors.". Neoplasia 13 (1): 1-11. PMID 21245935.
  13. ↑ Yang, P.; Kulig, K.; Boland, JM.; Erickson-Johnson, MR.; Oliveira, AM.; Wampfler, J.; Jatoi, A.; Deschamps, C. et al. (Jan 2012). "Worse disease-free survival in never-smokers with ALK+ lung adenocarcinoma.". J Thorac Oncol 7 (1): 90-7. doi:10.1097/JTO.0b013e31823c5c32. PMID 22134072.
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