title: Topic update: effects of colorectal cancer treatments on female fertility and potential methods for fertility preservation.
abstract: OBJECTIVE
  Preservation of fertility in young females with a diagnosis of colorectal cancer is gaining increasing importance as survival rates of cancer increase. This review examines the effects of pelvic surgery, chemotherapy, and radiotherapy on fecundity. It also discusses the options available to patients including ovarian transposition, gonadotropin-releasing hormone analogs, embryo and ovarian cryopreservation, and ovarian tissue transplantation.
  
  
  METHODS
  A search of MEDLINE, EMBASE, and the Cochrane library was performed using keywords and exploded Mesh search headings and the subsequent articles were reviewed. Relevant studies were included.
  
  
  RESULTS
  There are no studies that examine the effect of surgery for colorectal cancer on female fertility, in particular, surgery below the peritoneal reflection for rectal cancer. However, patients with familial adenomatous polyposis have a similar fecundity before and after proctocolectomy with ileal pouch-anal anastomosis. These patients did significantly better than patients with ulcerative colitis who underwent the same procedure. There is conflicting evidence regarding the effects of open vs laparoscopic surgery on fertility. Oxaliplatin, an adjuvant therapy, has moderate gonadotoxic effects. Fluorouracil is considered to have almost no effect on human reproductive function. Gonadotropin-releasing hormone agonists are currently used to preserve female fecundity during chemotherapy. A recent update of patients treated for Hodgkin lymphoma showed that significantly fewer women treated with a gonadotropin-releasing hormone agonist during chemotherapy exhibited premature ovarian failure. Ovarian transposition reduces the radiation dose to approximately 5% to 10% of the dose to the ovaries in their normal position. Other options are available to women with cancer who wish to preserve their germ line, including embryo and oocyte cryopreservation and ovarian tissue cryopreservation.
  
  
  CONCLUSIONS
  Significant advances are now allowing females to preserve their fertility after cancer treatment. It is essential that patients receive adequate fertility counseling before any intervention to give them an opportunity to consider fertility alternatives.
authors.affiliation: Department of Colorectal Surgery, Mater Misericordiae University Hospital, Dublin, Ireland.
authors.forename: Mary Teresa
authors.initials: MT
authors.lastname: O'Neill
authors.forename: Tara
authors.initials: T
authors.lastname: Ni Dhonnchu
authors.forename: Ann E
authors.initials: AE
authors.lastname: Brannigan
mesh_terms: D015179:Colorectal Neoplasms / Q000150:complications / Q000473:pathology / Q000628:therapy*; D005260:Female; D006801:Humans; D007247:Infertility, Female / Q000453:epidemiology* / Q000473:pathology / Q000517:prevention & control*