Molecular detection (k-ras) of exfoliated tumour cells in the pelvis is a prognostic factor after resection of rectal cancer?
BACKGROUND
After total mesorectal excision (TME) for rectal cancer around 10% of patients develops local recurrences within the pelvis. One reason for recurrence might be spillage of cancer cells during surgery. This pilot study was conducted to investigate the incidence of remnant cancer cells in pelvic lavage after resection of rectal cancer. DNA from cells obtained by lavage, were analysed by denaturing capillary electrophoresis with respect to mutations in hotspots of the k-ras gene, which are frequently mutated in colorectal cancer.


RESULTS
Of the 237 rectal cancer patients analyzed, 19 had positive lavage fluid. There was a significant survival difference (p = 0.006) between patients with k-ras positive and negative lavage fluid.


CONCLUSIONS
Patients with k-ras mutated cells in the lavage immediately after surgery have a reduced life expectation. Detection of exfoliated cells in the abdominal cavity may be a useful diagnostic tool to improve the staging and eventually characterize patients who may benefit from aggressive multimodal treatment of rectal cancer.
Kristensen
Annette Torgunrud
AT
Section for Surgical Oncology, Rikshospitalet-Radiumhospitalet Medical Center, Montebello, Oslo, Norway. a.t.kristensen@medisin.uio.no
Wiig
Johan N
JN
Larsen
Stein G
SG
Giercksky
Karl-Erik
KE
Ekstrøm
Per O
PO
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D011905:Genes, ras; D006801:Humans; D008297:Male; D008875:Middle Aged; D009362:Neoplasm Metastasis; D009369:Neoplasms / Q000235:genetics* / Q000378:metabolism*; D010388:Pelvis / Q000473:pathology*; D010865:Pilot Projects; D012004:Rectal Neoplasms / Q000473:pathology / Q000601:surgery*; D012008:Recurrence; D016896:Treatment Outcome