[Sustained complete response in lung metastasis of breast cancer by goserelin--report of two cases].

We report two patients with lung metastasis of breast cancer who had durable complete responses (CR) with goserelin. The first patient was a 48-year-old woman diagnosed with left breast cancer (T1N0M0, Stage I) at the age of 40, for which she underwent mastectomy. The tumor was estrogen receptor (ER) and progesterone receptor (PgR) positive. She received tamoxifen for 2 years as adjuvant therapy. After 8 years and 7 months, a lung metastasis was found by chest X-p, and treatment with goserelin was started. After 11 months of this treatment a CR was achieved, and the response lasted 3 years and 5 months. The second patient was a 38-year-old woman with a diagnosis of lung metastasis. She underwent right mastectomy at the age of 29 for breast cancer (T2N1M0, Stage IIB), and the tumor was ER and PgR positive. She received tamoxifen and doxifluridine for 2 years as adjuvant therapy. Eight years and 6 months after the mastectomy, a lung metastasis was found by chest X-p, and goserelin treatment was started. After 8 months of this treatment, chest X-p and CT revealed a complete regression of the lung metastasis, and response lasted 1 years and 7 months. Serum estradiol levels were suppressed below 10 pg/ml during the treatment in both patients. These results indicate the usefulness of LH-RH agonist in the treatment of recurrent breast cancer.