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Wikipedia

Precancerous condition

A precancerous condition is a condition, tumor or lesion involving abnormal cells which are associated with an increased risk of developing into cancer.[1][2][3] Clinically, precancerous conditions encompass a variety of abnormal tissues with an increased risk of developing into cancer. Some of the most common precancerous conditions include certain colon polyps, which can progress into colon cancer, monoclonal gammopathy of undetermined significance, which can progress into multiple myeloma or myelodysplastic syndrome.[4] and cervical dysplasia, which can progress into cervical cancer.[5] Bronchial premalignant lesions can progress to squamous cell carcinoma of the lung.[6]

Precancerous condition
Other namesPremalignant condition, precancer, premalignancy, dysplasia, intraepithelial neoplasm, carcinoma in situ
Micrograph of high grade squamous intraepithelial lesion, a precancerous condition of the uterine cervix. Pap stain.
SpecialtyOncology

Pathologically, precancerous tissue can range from benign neoplasias, which are tumors which don't invade neighboring normal tissues or spread to distant organs, to dysplasia,[1] a collection of highly abnormal cells which, in some cases, has an increased risk of progressing to anaplasia and invasive cancer which is life-threatening. Sometimes, the term "precancer" is also used for carcinoma in situ, which is a noninvasive cancer that has not grown and spread to nearby tissue, unlike the invasive stage. As with other precancerous conditions, not all carcinoma in situ will become an invasive disease but is at risk of doing so.

Classification

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The term precancerous or premalignant condition may refer to certain conditions, such as monoclonal gammopathy of unknown significance, or to certain lesions, such as colorectal adenoma (colon polyps), which have the potential to progress into cancer (see: Malignant transformation). Premalignant lesions are morphologically atypical tissue which appear abnormal when viewed under the microscope, and which are more likely to progress to cancer than normal tissue.[7] Precancerous conditions and lesions affect a variety of organ systems, including the skin, oral cavity, stomach, colon, lung, and hematological system. Some authorities also refer to hereditary genetic conditions which predispose to developing cancer, such as hereditary nonpolyposis colorectal cancer, as a precancerous condition, as individuals with these conditions have a much higher risk of developing cancer in certain organs.[3]

Signs and symptoms

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The signs and symptoms of precancerous conditions differ based on the organ affected. In many cases, individuals with precancerous conditions do not notice any symptoms. Precancerous conditions of the skin or oral cavity can appear as visible lesions without associated pain or discomfort,[7] while precancerous conditions of the hematological system are typically asymptomatic, and in the case of monoclonal gammopathy of unknown significance, it may only rarely cause numbness and tingling in the hands and feet or difficulty with balance[8] (see: peripheral neuropathy).

Causes

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Main article: Causes of cancer

In most cases, many risk factors for precancerous conditions and lesions are the same risk factors that determines individuals vulnerable to a specific cancer. For example, individuals with cervical or anal infection with oncogenic, or cancer causing, strains of the human papilloma virus (HPV) are at higher risk for cervical and anal cancers,[9] as well as for cervical and anal dysplasia.[9] Similarly, sun or especially UV exposure is an important risk factor for both actinic keratosis which can progress into melanomas[10] as well as skin cancer. Smoking is a risk factor for premalignant (as well as malignant) lung lesions. Hereditary conditions that are risk factors to cancer can also be risk factors to premalignant lesions. However, in many cases, precancerous conditions or lesions can be sporadic and idiopathic in nature, meaning that they are not associated with a hereditary genetic risk factor to the particular cancer, nor with a direct causative agent or other identifiable cause.[11]

Pathophysiology

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Main article: Carcinogenesis
 
Stepwise progression from normal tissue to precancerous lesion to invasive cancer

The pathophysiology of precancerous lesions is thought to be similar to that of cancer, and also varies depending on the disease site and type of lesion.[12] It is thought that cancer is always preceded by a clinically silent premalignant phase during which many oncogenic genetic and epigenetic alterations accumulate before it is truly malignant. The duration of this premalignant phase can vary from cancer to cancer, disease site to site and from individual to individual.[11] Increasing evidence suggests that the evasion of the immune system occurs in premalignant lesions,[13] and that the nature of the first immune response to these lesions may determine if they progress to cancer or regress to normal tissue.[14][15]

Examples

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Skin

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Breast

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Head and neck/oral

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Gastrointestinal

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Respiratory

  • Bronchial premalignant lesions

Gynecological

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Urological

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Hematological

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References

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  1. ^ a b "NCI Dictionary of Cancer Terms". National Cancer Institute. 2011-02-02. Retrieved 2018-03-28.
  2. ^ "Precancerous conditions of the colon or rectum". Canadian cancer society. Retrieved 2018-03-19.
  3. ^ a b "Precancerous conditions of the esophagus". Canadian cancer society. Retrieved 2018-03-19.
  4. ^ Korde N, Kristinsson SY, Landgren O (May 2011). "Monoclonal gammopathy of undetermined significance (MGUS) and smoldering multiple myeloma (SMM): novel biological insights and development of early treatment strategies". Blood. 117 (21): 5573–5581. doi:10.1182/blood-2011-01-270140. PMC 3316455. PMID 21441462.
  5. ^ "Precancerous conditions of the cervix". Canadian cancer society. Retrieved 2018-03-19.
  6. ^ Beane J, Mazzilli SA, Tassinari AM, Liu G, Zhang X, Liu H, et al. (September 2017). "Detecting the Presence and Progression of Premalignant Lung Lesions via Airway Gene Expression". Clinical Cancer Research. 23 (17): 5091–5100. doi:10.1158/1078-0432.CCR-16-2540. PMC 7404813. PMID 28533227.
  7. ^ a b c d e Yardimci G, Kutlubay Z, Engin B, Tuzun Y (December 2014). "Precancerous lesions of oral mucosa". World Journal of Clinical Cases. 2 (12): 866–872. doi:10.12998/wjcc.v2.i12.866. PMC 4266835. PMID 25516862.
  8. ^ "MGUS - MGUS Multiple Myeloma - MGUS Myeloma -Monoclonal Gammopathy". Multiple Myeloma Research Foundation. Archived from the original on 2017-07-10. Retrieved 2018-03-28.
  9. ^ a b Roberts JR, Siekas LL, Kaz AM (February 2017). "Anal intraepithelial neoplasia: A review of diagnosis and management". World Journal of Gastrointestinal Oncology. 9 (2): 50–61. doi:10.4251/wjgo.v9.i2.50. PMC 5314201. PMID 28255426.
  10. ^ "Actinic keratosis - Symptoms and causes". Mayo Clinic. Retrieved 2018-03-28.
  11. ^ a b Willimsky G, Czéh M, Loddenkemper C, Gellermann J, Schmidt K, Wust P, et al. (July 2008). "Immunogenicity of premalignant lesions is the primary cause of general cytotoxic T lymphocyte unresponsiveness". The Journal of Experimental Medicine. 205 (7): 1687–1700. doi:10.1084/jem.20072016. PMC 2442645. PMID 18573907.
  12. ^ Hyndman IJ (April 2016). "Review: the Contribution of both Nature and Nurture to Carcinogenesis and Progression in Solid Tumours". Cancer Microenvironment. 9 (1): 63–69. doi:10.1007/s12307-016-0183-4. PMC 4842185. PMID 27066794.
  13. ^ Mascaux C, Angelova M, Vasaturo A, Beane J, Hijazi K, Anthoine G, et al. (July 2019). "Immune evasion before tumour invasion in early lung squamous carcinogenesis" (PDF). Nature. 571 (7766): 570–575. doi:10.1038/s41586-019-1330-0. PMID 31243362. S2CID 195657244.
  14. ^ Maoz A, Merenstein C, Koga Y, Potter A, Gower AC, Liu G, et al. (September 2021). "Elevated T cell repertoire diversity is associated with progression of lung squamous cell premalignant lesions". Journal for Immunotherapy of Cancer. 9 (9): e002647. doi:10.1136/jitc-2021-002647. PMC 8477334. PMID 34580161.
  15. ^ Beane JE, Mazzilli SA, Campbell JD, Duclos G, Krysan K, Moy C, et al. (April 2019). "Molecular subtyping reveals immune alterations associated with progression of bronchial premalignant lesions". Nature Communications. 10 (1): 1856. Bibcode:2019NatCo..10.1856B. doi:10.1038/s41467-019-09834-2. PMC 6478943. PMID 31015447.
  16. ^ "Actinic Keratosis". skincancer.org. Retrieved 2018-03-19.
  17. ^ Neville BW, Day TA (July 2002). "Oral cancer and precancerous lesions". CA: A Cancer Journal for Clinicians. 52 (4): 195–215. doi:10.3322/canjclin.52.4.195. PMID 12139232. S2CID 3238352.
  18. ^ "What Is Vaginal Cancer?". www.cancer.org. Retrieved 2018-03-28.
  19. ^ a b Arya M, Kalsi J, Kelly J, Muneer A (March 2013). "Malignant and premalignant lesions of the penis". BMJ. 346: f1149. doi:10.1136/bmj.f1149. PMID 23468288. S2CID 33771829.
  20. ^ "Bladder Cancer Staging | Bladder Cancer Stages". www.cancer.org. Retrieved 2018-03-28.
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