https://www.cancer.gov/about-cancer/understanding/what-is-cancer#:~:text=Cancer%20is%20caused%20by%20changes,cell%20growth%20to%20become%20oncogenes.
https://www.cancer.org/cancer/diagnosis-staging/signs-and-symptoms-of-cancer.html
https://www.mayoclinic.org/diseases-conditions/cancer/diagnosis-treatment/drc-20370594#:~:text=In%20most%20situations%2C%20a%20biopsy,sizes%20and%20without%20apparent%20organization.
https://www.cdc.gov/cancer/survivors/patients/treatments.htm#:~:text=Surgery%3A%20An%20operation%20where%20doctors,hormones%20they%20need%20to%20grow.