Metastatic tumor doubling time is an independent predictor of intrapulmonary recurrence after pulmonary resection of solitary pulmonary metastasis from colorectal cancer.
BACKGROUND
Several investigators have previously reported the prognostic factors affecting survival after a surgical resection of pulmonary metastasis from colorectal cancer (CRC). However, there have so far been no reports describing prognostic factors related to the tumor doubling time (TDT) of pulmonary metastasis.


METHODS
65 patients with solitary pulmonary metastasis from CRC were retrospectively reviewed and the prognostic factors after pulmonary resection including TDT were analyzed.


RESULTS
The 5-year intrapulmonary recurrence-free survival rates after pulmonary resection was 59.9%. The TDT of pulmonary metastasis (<100 vs. 100 days or higher) was only a significant prognostic factor in intrapulmonary recurrence after the pulmonary resection (p = 0.0006). The 5-year overall survival rate after the pulmonary resection was 64.2%. Preoperative serum carcinoembryonic antigen (CEA) level (<5 vs. 5 ng/ml or higher) was the only significant prognostic factor in overall survival after the pulmonary resection (p = 0.0049). The overall survival of patients whose TDT was 100 days or higher tended to be better than that of patients whose TDT was <100 (p = 0.0631).


CONCLUSIONS
The TDT of solitary pulmonary metastasis is a significant prognostic factor after surgery for solitary pulmonary metastasis from CRC.
Tomimaru
Yoshito
Y
Department of Surgery, Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka, Japan.
Noura
Shingo
S
Ohue
Masayuki
M
Okami
Jiro
J
Oda
Kazuyuki
K
Higashiyama
Masahiko
M
Yamada
Terumasa
T
Miyashiro
Isao
I
Ohigashi
Hiroaki
H
Yano
Masahiko
M
Kodama
Ken
K
Ishikawa
Osamu
O
Murata
Kohei
K
Yokouchi
Hideoki
H
Sasaki
Yo
Y
Kameyama
Masao
M
Imaoka
Shingi
S
D000328:Adult; D000368:Aged; D002272:Carcinoembryonic Antigen / Q000097:blood; D002277:Carcinoma / Q000473:pathology* / Q000556:secondary / Q000601:surgery; D015179:Colorectal Neoplasms / Q000473:pathology*; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008175:Lung Neoplasms / Q000473:pathology* / Q000556:secondary / Q000601:surgery; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000401:mortality / Q000473:pathology*; D011237:Predictive Value of Tests; D011379:Prognosis; D012189:Retrospective Studies; D015996:Survival Rate; D013997:Time Factors
D002272:Carcinoembryonic Antigen