ORLANDOOne in four
patients with resected rectal cancer who later underwent surgical salvage for
recurrence at a single site were still alive at 5 years, according to a
subanalysis of a large, randomized Intergroup study presented at the 38th
Annual Meeting of the American Society of Clinical Oncology (abstract 507).
"Approximately 27% of the patients have long-term survival and appear to be
cured," said Michael J. O’Connell, MD, director, Allegheny Cancer Center,
Allegheny General Hospital, Pittsburgh.
This is believed to be the only study to date to look
specifically at the role of surgical salvage after potentially curative
surgical resection in a large series of rectal cancer patients. The analysis is
based on data from Intergroup 0114, a randomized study of four adjuvant
fluorouracil (5-FU)-based chemotherapy regimens combined with radiotherapy
following resection of T3, T4, and node-positive rectal cancer. Six cooperative
groups enrolled 1,792 patients.
Previously, investigators in INT 0114 reported that, with
8.9 years of follow-up, there were no statistically significant outcome
differences between treatment groups. About 42%, or 715 patients, experienced
recurrence; another 10% died with no evidence of malignant disease.
More recently, investigators conducted a subset analysis to
determine the impact of salvage therapy in the 500 evalu-able patients who had
recurrence in a single organ or site (about 71% of the recurrent patients in
INT 0114). Most commonly, the recurrence was in the liver, lungs, or tissues
around the resection site. Most recurrences were detected by chest x-rays or CT
scans (70% to 80%).
Of those 500 patients with a solitary site of recurrence,
171 (34%) underwent further surgery, and of that group, approximately 27% had
long-term disease-free survival out to 5 years.
"The flat plateau phase of these curves suggests that 25% to
30% of the patients have been cured," said Dr. O’Connell, who presented the
results on behalf of lead investigator Joel E. Tepper, MD.
This substudy illustrates some of the patterns of surgical
salvage after primary therapy in North America, Dr. O’Connell said. For
example, it shows that a high percentage of patients with rectal cancer present
with a solitary site of recurrence and that about one third of these patients
receive a surgical procedure with curative intent.