Regression

Regression in medicine is the partial or complete reversal of a disease's signs and symptoms.

* Clinically, regression generally refers to a decrease in severity of symptoms without completely disappearing. At a later point, symptoms may return. These symptoms are then called recidive.

Mandard tumor regression grade (TRG), in this case showing rectal cancer.[1]

* In cancer, regression refers to a specific decrease in the size or extent of a tumour.[2] In histopathology, histological regression is one or more areas within a tumor in which neoplastic cells have disappeared or decreased in number.[3] In melanomas, this means complete or partial disappearance from areas of the dermis (and occasionally from the epidermis), which have been replaced by fibrosis, accompanied by melanophages, new blood vessels, and a variable degree of inflammation.[3]

## References

1. ↑ Santos, Marisa D.; Silva, Cristina; Rocha, Anabela; Nogueira, Carlos; Castro-Poças, Fernando; Araujo, António; Matos, Eduarda; Pereira, Carina et al. (2017). "Predictive clinical model of tumor response after chemoradiation in rectal cancer". Oncotarget 8 (35): 58133–58151. doi:10.18632/oncotarget.19651. ISSN 1949-2553. PMID 28938543.
-Figure 3- available via license: Creative Commons Attribution 3.0 Unported
2. ↑ "Regression" (in en). National Cancer Institute. https://www.cancer.gov/publications/dictionaries/cancer-terms?cdrid=46039. Retrieved 31 August 2017.
3. ↑ 3.0 3.1 Ribero, Simone; Gualano, Maria Rosaria; Osella-Abate, Simona; Scaioli, Giacomo; Bert, Fabrizio; Sanlorenzo, Martina; Balagna, Elena; Fierro, Maria Teresa et al. (2015). "Association of Histologic Regression in Primary Melanoma With Sentinel Lymph Node Status". JAMA Dermatology 151 (12): 1301–1307. doi:10.1001/jamadermatol.2015.2235. ISSN 2168-6068. PMID 26332402.

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