The impact of conventional plus high dose chemotherapy with autologous bone marrow transplantation on hematologic toxicity during subsequent local-regional radiotherapy for breast cancer.
BACKGROUND
Forty patients with Stage II-III breast cancer with 10 or more positive axillary nodes were treated with mastectomy followed by four cycles of standard dose CAF (cytoxan, Adriamycin, 5-FU), followed by high dose cytoxan, cisplatin, carmustine (HDCT) with autologous bone marrow transplant support (ABMT), and local-regional radiotherapy (LR XRT). During LR XRT, the hematologic toxicity experienced by these patients appeared more severe than that usually seen in patients not heavily pretreated with chemotherapy. Radiation therapy was interrupted in four patients (10%) because of thrombocytopenia and leukopenia. This observation prompted a comparison of the hematologic changes seen in this group with those seen in patients not treated previously with chemotherapy.


METHODS
A detailed analysis of changes in hematologic parameters during LR XRT was performed in 33 evaluable patients who received CAF-HDCT/ABMT and compared with a "control" group of 17 women who did not receive prior chemotherapy.


RESULTS
The mean pretreatment leukocyte, platelet, and hematocrit counts were lower in the CAF-HDCT/ABMT group than in the control group, with the differences indicating statistical significance for the latter two (P = 0.17, P < 0.001, and P = 0.001, respectively). None of the control patients required a treatment interruption because of hematologic toxicity, whereas four of the CAF-HDCT/ABMT patients did. Among the CAF-HDCT/ABMT patients, a leukocyte count nadir of less than 2.0, a platelet nadir of less than 50,000, and a hematocrit nadir of less than 25 occurred in 12%, 19%, and 9%, respectively. The corresponding rates of control patients were 6%, 0%, and 0%, respectively. Relative to their pretreatment levels, however, both groups experienced similar declines in platelet and leukocyte counts.


CONCLUSIONS
The higher rate of hematologic toxicity observed in the patients who previously received conventional chemotherapy plus HDCT/ABMT appears to have been due primarily to lower preradiotherapy blood counts.
Department of Radiation Oncology, Duke University Medical Center Durham, North Carolina 27710.
L B
LB
Marks
G L
GL
Rosner
L R
LR
Prosnitz
M
M
Ross
J J
JJ
Vredenburgh
W P
WP
Peters
D000230:Adenocarcinoma / Q000188:drug therapy / Q000532:radiotherapy / Q000601:surgery / Q000628:therapy*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000009:adverse effects / Q000627:therapeutic use*; D001772:Blood Cell Count / Q000187:drug effects / Q000528:radiation effects; D016026:Bone Marrow Transplantation; D001943:Breast Neoplasms / Q000188:drug therapy / Q000532:radiotherapy / Q000601:surgery / Q000628:therapy*; D017024:Chemotherapy, Adjuvant; D003131:Combined Modality Therapy; D005260:Female; D006400:Hematocrit; D006412:Hematopoietic Stem Cells / Q000187:drug effects / Q000528:radiation effects; D006801:Humans; D007958:Leukocyte Count / Q000187:drug effects / Q000528:radiation effects; D007970:Leukopenia / Q000139:chemically induced* / Q000209:etiology; D008197:Lymph Node Excision; D008207:Lymphatic Metastasis; D008408:Mastectomy; D008875:Middle Aged; D010976:Platelet Count / Q000187:drug effects / Q000528:radiation effects; D011879:Radiotherapy Dosage; D013921:Thrombocytopenia / Q000139:chemically induced* / Q000209:etiology; D014182:Transplantation, Autologous