Low locoregional recurrence rates in patients treated after 2000 with doxorubicin based chemotherapy, modified radical mastectomy, and post-mastectomy radiation.
OBJECTIVE
To determine the rate of locoregional recurrence (LRR) associated with modern tri-modality therapy.


METHODS
We retrospectively reviewed data from 291 consecutive PMRT patients treated from 1999 to 2001. These patients were compared to an historical group of 313 patients treated from 1979 to 1988 who had fluoroscopic simulation and contour-generated 2D planning. 1999-2001 spans the adoption of CT simulators for breast radiation therapy and a comparison was made between patients simulated before and after the implementation of CT simulation. Five-year actuarial rates for LRR, distal metastasis (DM), and overall survival (OS) between the pre and post CT simulation cohorts were compared as well.


RESULTS
Compared to a 2D planned historic control, the combined contemporary patients had improved outcomes at 5years for all endpoints studied; LRR 3.0% vs. 11.5%, DM 29.2% vs. 39.2%, and OS 79.2% vs. 70.6% (p=0.0004, 0.0052, 0.0012, respectively). Significant factors in a multivariate analysis for LRR were: advanced T-stage (RR=2.14, CI=1.11-4.11, p=0.023), and percent positive nodes (RR=1.01, CI=1.00-1.02, p=0.012). The comparison of the pre and post CT-simulated PMRT patients (1999-2001) found no significant difference in any endpoint.


CONCLUSIONS
The rate of locoregional control for PMRT patients treated with modern radiotherapy is outstanding and has improved significantly compared to historical controls.
The Methodist Hospital, Houston, TX, USA.
Michael P
MP
Greenbaum
Eric A
EA
Strom
Pamela K
PK
Allen
George H
GH
Perkins
Julia L
JL
Oh
Welela
W
Tereffe
Tse-Kuan
TK
Yu
Thomas A
TA
Buchholz
Wendy A
WA
Woodward
D000328:Adult; D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D001943:Breast Neoplasms / Q000401:mortality / Q000473:pathology / Q000628:therapy*; D003131:Combined Modality Therapy; D004317:Doxorubicin / Q000008:administration & dosage; D005260:Female; D006801:Humans; D015411:Mastectomy, Modified Radical / Q000379:methods*; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000453:epidemiology*; D012189:Retrospective Studies
D004317:Doxorubicin