Colorectal adenocarcinoma

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Colorectal adenocarcinoma
Diagnosis in short

Colorectal adenocarcinoma. H&E stain.
LM DDx other adenocarcinomas (e.g. anal gland adenocarcinoma, lung adenocarcinoma, ovarian adenocarcinoma), traditional adenoma esp. with high-grade dysplasia, sessile serrated adenoma with dysplasia
IHC CK20 +ve, CDX2 +ve, CK7 -ve, beta-catenin (nuclear) +ve
Grossing notes lower anterior resection for cancer grossing, other protocols
Site rectum, colon, cecum, appendix
Associated Dx long standing IBD (Crohn's disease, ulcerative colitis), traditional adenoma esp. with high-grade dysplasia, sessile serrated adenoma esp. with dysplasia
Syndromes familial adenomatous polyposis, Lynch syndrome, Peutz-Jeghers syndrome, Juvenile polyposis syndrome, serrated polyposis syndrome, MUTYH polyposis syndrome, Cowden syndrome
Signs +/-blood in stools, +/-abdominal mass, +/-rectal mass, +/-signs of bowel obstruction (nausea, vomiting), +/-narrow caliber stools
Symptoms +/-constipation
Prevalence common
Blood work +/-anemia (microcytic), +/-CEA elevated
Radiology +/-"apple core" lesion (classic), +/-findings of bowel obstruction (air-fluid levels esp. with transition point)
Endoscopy +/-suspicious mass (exophytic or ulcerated), presence of non-lifting sign, Kudo pit pattern Type VI or Type VN
Prognosis good to poor
Other fecal occult blood test (FOBT) +ve
Clin. DDx colorectal tumours, other causes - DDx dependent on presentation
Treatment usually surgical resection +/-chemotherapy +/-radiation

Colorectal adenocarcinoma is very common, a leading cause of death due to cancer, and the most common form of colon cancer.

The colon and rectum are lumped together as the mucosa in the large bowel is very similar. Thus, colonic adenocarcinoma and rectal adenocarcinoma redirect to this article.

The larger generally topic of colorectal tumours and the pathogenesis of colorectal adenocarcinoma is dealt with in the colorectal tumours article.

Colorectal carcinoma, abbreviated CRC, is typically considered a synonym. Cecal adenocarcinoma is also lumped into CRC.

General

  • Very common.
  • Rectum and sigmoid > proximal large bowel.

Presentation:

Pathogenesis - see pathogenesis of colorectal carcinoma.

Clinical - serum:

  • CEA elevated.[1]
  • CA19-9 elevated.
  • Colon cancer-specific antigen-2 (CCSA-2) elevated.[2]
    • Relatively new; preliminary in 2014.

Gross

Often circumferential or near circumferential:

  • These are referred to as "apple core lesion" or "napkin-ring" lesion.

Mucosa:

  • Granular appearance.
  • Raised (exophytic) or heaped edges with ulceration.

Note:

  • Total mesorectal excisions should be assessed for completeness.
  • The (soft tissue) radial margins, as present in TMEs and right hemicolectomies, should be inked.[3][4]

Images

  • CRC - gross. (WC)

  • CRC - gross. (WC)

  • Rectum - anterior view. (WC)

  • Rectum - lateral view. (WC)

  • Rectum - inked. (WC)

  • Rectum - opened (WC)

Microscopic

Features:

  • Nuclear atypia:
    • Nuclear pseudostratification.
    • Nuclear hyperchromasia.
    • Chromatin clearing or granularity.
  • +/-Necrosis.
  • Architecture - important for grading:
    • Glands.
    • Sheets.

DDx:

Images

  • CRC - low mag. (WC)

  • CRC - intermed. mag. (WC)

  • CRC - high mag. (WC)

  • CRC - low mag. (WC)

  • CRC - intermed. mag. (WC)

  • CRC - high mag. (WC)

  • Cecal adenocarcinoma. (WC/Nephron)

  • Colorectal adenocarcinoma. (WC)

  • CRC lymph node metastasis. (WC/Nephron)

www:

Grading

Based on component composed of glands:

  • >=50% of tumour = low-grade (well-differentiated and moderately differentiated).
  • <50% of tumour = high-grade (poorly-differentiated and undifferentiated).

Peritumoural lymphocytic response

  • AKA Crohn's-like lymphoid reaction.
  • AKA Crohn's like reaction.[5]
  • AKA Crohn-like response.[6]
Main article: Peritumoural lymphocytic response

Intratumoural lymphocytic response

  • AKA tumour-infiltrating lymphocytes, abbreviated TILs.

General

  • Finding is suggestive of microsatellite instabillity.[7]

Microscopic

Features:

  • >10 lymphocytes/0.94 mm2.[8] †
    • Lymphocytes should be between the tumour cells.[8][9] ††
      • Other lymphocytes do not count.

Note:

  • † Greenson et al. says >2 lymphocytes/HPF, where 5 HPF are sampled. Since the sample area given by Greenson et al. is 0.94 mm2, their field diameter is ~ 0.4892 mm. This field diameter corresponds to a 20 mm eye piece (0.4892 mm * 40x = 19.57 mm).
    • Many microscopes in use today have a field diameter at 40x of ~ 0.55 mm; thus, 4 fields would be approximately 0.95 mm2.
  • †† Definitions vary substantially - some authors consider lymphocytes adjacent to the tumour (in the stroma around the tumour cells) "intratumoural".[10]
Images

  • TILs - high mag. (WC)

  • TILS - very high mag. (WC)

  • TILs - high mag.

  • TILs - very high mag.

  • TILs - extremely high mag.

www:

Tumour deposits

  • AKA discoutinuous extramural extension.
  • AKA peritumoral deposits.

General

Definition - TNM/AJCC 7th edition:[12]

  • Microscopic or macroscopic nodule in the lymphatic drainage bed of the tumour.
    • No standardized distance (from tumour) criteria are defined.[13]
  • No findings suggestive of it being a lymph node replaced by tumour:
    1. No significant lymphoid tissue.
    2. Irregular contour.
      • Round nodules of tumour are considered lymph nodes that are replaced by tumour.

Significance:

  • Poor prognosticator.
    • Can be understood as a type of invasive front/border, e.g. well-circumscribed border versus infiltrative border.[13]

Staging implications:

  • Tumour deposits are not counted as (positive) lymph nodes[12] and in the context of positive lymph nodes do not change the N stage.
    • If no positive lymph nodes are present, the N stage is pN1c.
  • The T stage is not affected by tumour deposits.[12]

Notes:

Ueno criteria

Ueno et al. propose that a tumour deposit is either:[13]

  1. >=2 mm from the tumour front.
  2. >=2 mm (radially) from the deepest aspect of the muscularis propria, if the tumour is not present in the plane of section.

Tumour regression

There is a three tiered regression grading system by Ryan et al. for colorectal cancer that has essentially been adopted by CAP:[15]

Grade Features
Grade 1 small groups of tumour cells or single tumour cells
Grade 2 definite tumour but more fibrosis ("cancer outgrown by fibrosis")
Grade 3 definite tumour with no fibrosis or tumour with a lesser amount of fibrosis ("fibrosis outgrown by cancer")

IHC

  • CK7 -ve. ‡
  • CK20 +ve.
  • CEA +ve.
  • CDX2 +ve.

Note:

  • ‡ High stage colorectal cancer (CRC) may be CK7 +ve/CK20 +ve; in one series, 13% of stage 3 and 17% of stage 4 colorectal cancers were CK7 +ve/CK20 +ve.[16]

Molecular

  • KRAS mutation analysis.
    • Mutation present ~ 40% of CRC.
    • Mutations in codons 12 or 13 associated with failure of anti-EGFR therapy (e.g. cetuximab, panitumumab).[17]
  • BRAF mutation analysis.
    • V600E missense mutation found in ~10% CRC.[18]

Note:

  • KRAS mutations and BRAF mutations are considered mutually exclusive as they occur in the same pathway.

Sign out

Right hemicolectomy

TERMINAL ILEUM, CECUM, ASCENDING COLON AND APPENDIX, RIGHT HEMICOLECTOMY:
- INVASIVE ADENOCARCINOMA, LOW-GRADE, pT2, pN0.
-- MARGINS NEGATIVE FOR DYSPLASIA AND NEGATIVE FOR MALIGNANCY.
-- PLEASE SEE TUMOUR SUMMARY.
- SMALL BOWEL WALL WITHIN NORMAL LIMITS.
- APPENDIX WITHOUT SIGNIFICANT PATHOLOGY.
- TWELVE LYMPH NODES NEGATIVE FOR MALIGNANCY ( 0 POSITIVE / 12 ).

Mucinous component present

TERMINAL ILEUM, CECUM, ASCENDING COLON AND APPENDIX, RIGHT HEMICOLECTOMY:
- INVASIVE ADENOCARCINOMA WITH A MUCINOUS COMPONENT, LOW-GRADE, pT1, pN0.
-- MARGINS NEGATIVE FOR DYSPLASIA AND NEGATIVE FOR MALIGNANCY.
-- PLEASE SEE TUMOUR SUMMARY.
- SMALL BOWEL WALL WITHIN NORMAL LIMITS.
- APPENDIX WITHOUT SIGNIFICANT PATHOLOGY.
- FOURTEEN LYMPH NODES NEGATIVE FOR MALIGNANCY ( 0 POSITIVE / 14 ).

Left hemicolectomy

LEFT COLON, LEFT HEMICOLECTOMY:
- INVASIVE ADENOCARCINOMA, LOW-GRADE, pT1, pN0.
-- MARGINS NEGATIVE FOR DYSPLASIA AND NEGATIVE FOR MALIGNANCY.
-- TWELVE LYMPH NODES NEGATIVE FOR MALIGNANCY ( 0 POSITIVE / 12 ).
-- PLEASE SEE TUMOUR SUMMARY.

See also

References

  1. ↑ Bagaria, B.; Sood, S.; Sharma, R.; Lalwani, S. (Sep 2013). "Comparative study of CEA and CA19-9 in esophageal, gastric and colon cancers individually and in combination (ROC curve analysis).". Cancer Biol Med 10 (3): 148-57. doi:10.7497/j.issn.2095-3941.2013.03.005. PMID 24379990.
  2. ↑ Xue, G.; Wang, X.; Yang, Y.; Liu, D.; Cheng, Y.; Zhou, J.; Cao, Y. (2014). "Colon cancer-specific antigen-2 may be used as a detecting and prognostic marker in colorectal cancer: a preliminary observation.". PLoS One 9 (4): e94252. doi:10.1371/journal.pone.0094252. PMID 24710115.
  3. ↑ URL: http://www.cancercare.on.ca/common/pages/UserFile.aspx?fileId=13954. Accessed on: 6 February 2013.
  4. ↑ Bateman, AC.; Carr, NJ.; Warren, BF. (Apr 2005). "The retroperitoneal surface in distal caecal and proximal ascending colon carcinoma: the Cinderella surgical margin?". J Clin Pathol 58 (4): 426-8. doi:10.1136/jcp.2004.019802. PMID 15790712.
  5. ↑ Ogino, S.; Nosho, K.; Irahara, N.; Meyerhardt, JA.; Baba, Y.; Shima, K.; Glickman, JN.; Ferrone, CR. et al. (Oct 2009). "Lymphocytic reaction to colorectal cancer is associated with longer survival, independent of lymph node count, microsatellite instability, and CpG island methylator phenotype.". Clin Cancer Res 15 (20): 6412-20. doi:10.1158/1078-0432.CCR-09-1438. PMID 19825961.
  6. ↑ URL: http://www.cap.org/apps/docs/committees/cancer/cancer_protocols/2012/Colon_12protocol_3200.pdf. Accessed on: 14 September 2012.
  7. ↑ Iacopetta, B.; Grieu, F.; Amanuel, B. (Dec 2010). "Microsatellite instability in colorectal cancer.". Asia Pac J Clin Oncol 6 (4): 260-9. doi:10.1111/j.1743-7563.2010.01335.x. PMID 21114775.
  8. ↑ 8.0 8.1 Greenson, JK.; Bonner, JD.; Ben-Yzhak, O.; Cohen, HI.; Miselevich, I.; Resnick, MB.; Trougouboff, P.; Tomsho, LD. et al. (May 2003). "Phenotype of microsatellite unstable colorectal carcinomas: Well-differentiated and focally mucinous tumors and the absence of dirty necrosis correlate with microsatellite instability.". Am J Surg Pathol 27 (5): 563-70. PMID 12717242.
  9. ↑ 9.0 9.1 Garg, K.; Soslow, RA. (Aug 2009). "Lynch syndrome (hereditary non-polyposis colorectal cancer) and endometrial carcinoma.". J Clin Pathol 62 (8): 679-84. doi:10.1136/jcp.2009.064949. PMID 19638537.
  10. ↑ Ropponen, KM.; Eskelinen, MJ.; Lipponen, PK.; Alhava, E.; Kosma, VM. (Jul 1997). "Prognostic value of tumour-infiltrating lymphocytes (TILs) in colorectal cancer.". J Pathol 182 (3): 318-24. doi:10.1002/(SICI)1096-9896(199707)182:3318::AID-PATH8623.0.CO;2-6. PMID 9349235.
  11. ↑ Ross, JS.; Torres-Mora, J.; Wagle, N.; Jennings, TA.; Jones, DM. (Sep 2010). "Biomarker-based prediction of response to therapy for colorectal cancer: current perspective.". Am J Clin Pathol 134 (3): 478-90. doi:10.1309/AJCP2Y8KTDPOAORH. PMID 20716806.
  12. ↑ 12.0 12.1 12.2 12.3 Nagtegaal, ID.; Tot, T.; Jayne, DG.; McShane, P.; Nihlberg, A.; Marshall, HC.; Påhlman, L.; Brown, JM. et al. (Jun 2011). "Lymph nodes, tumor deposits, and TNM: are we getting better?". J Clin Oncol 29 (18): 2487-92. doi:10.1200/JCO.2011.34.6429. PMID 21555695.
  13. ↑ 13.0 13.1 13.2 Ueno, H.; Hashiguchi, Y.; Shimazaki, H.; Shinto, E.; Kajiwara, Y.; Nakanishi, K.; Kato, K.; Maekawa, K. et al. (Oct 2013). "Peritumoral deposits as an adverse prognostic indicator of colorectal cancer.". Am J Surg. doi:10.1016/j.amjsurg.2013.04.009. PMID 24112678.
  14. ↑ Puppa, G.; Ueno, H.; Kayahara, M.; Capelli, P.; Canzonieri, V.; Colombari, R.; Maisonneuve, P.; Pelosi, G. (Mar 2009). "Tumor deposits are encountered in advanced colorectal cancer and other adenocarcinomas: an expanded classification with implications for colorectal cancer staging system including a unifying concept of in-transit metastases.". Mod Pathol 22 (3): 410-5. doi:10.1038/modpathol.2008.198. PMID 19136930.
  15. ↑ Ryan, R.; Gibbons, D.; Hyland, JM.; Treanor, D.; White, A.; Mulcahy, HE.; O'Donoghue, DP.; Moriarty, M. et al. (Aug 2005). "Pathological response following long-course neoadjuvant chemoradiotherapy for locally advanced rectal cancer.". Histopathology 47 (2): 141-6. doi:10.1111/j.1365-2559.2005.02176.x. PMID 16045774.
  16. ↑ Hernandez, BY.; Frierson, HF.; Moskaluk, CA.; Li, YJ.; Clegg, L.; Cote, TR.; McCusker, ME.; Hankey, BF. et al. (Mar 2005). "CK20 and CK7 protein expression in colorectal cancer: demonstration of the utility of a population-based tissue microarray.". Hum Pathol 36 (3): 275-81. doi:10.1016/j.humpath.2005.01.013. PMID 15791572.
  17. ↑ Monzon, FA.; Ogino, S.; Hammond, ME.; Halling, KC.; Bloom, KJ.; Nikiforova, MN. (Oct 2009). "The role of KRAS mutation testing in the management of patients with metastatic colorectal cancer.". Arch Pathol Lab Med 133 (10): 1600-6. doi:10.1043/1543-2165-133.10.1600. PMID 19792050.
  18. ↑ Tie J, Gibbs P, Lipton L, et al. (July 2010). "Optimizing targeted therapeutic development: Analysis of a colorectal cancer patient population with the BRAF(V600E) mutation". Int J Cancer. doi:10.1002/ijc.25555. PMID 20635392.
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