Retrospective Analysis of Chemoradiotherapy for Limited-Stage Small-Cell Lung Cancer / 대한방사선종양학회지

PURPOSE: This study was designed to analyze the outcome and toxicity of thoracic radiation therapy (TRT) and chemotherapy for patients who suffer with limited-stage small-cell lung cancer (LS-SCLC). MATERIALS AND METHODS: We retrospectively studied 35 patients with LS-SCLC. TRT was administered once daily (1.8 to 2 Gy per fraction) and it was directed to the primary tumor for a total 50 to 66 Gy in 6 to 7 weeks. The patients received four cycles of etoposide plus cisplatin. TRT was begun on day 1 of the first cycle of chemotherapy in the concurrent arm and after the fourth cycle in the sequential arm. RESULTS: The median progression-free survival time was 16.5 months (95% confidence interval [CI], 9.0 to 24.1 months) for the sequential arm, and 26.3 months (95% CI, 16.6 to 35.9 months) for the concurrent arm. The 2-year progression-free survival rate was 16.0 percent for the sequential arm and 50.0 percent for the concurrent arm (p=0.0950 by log-rank test). Leukopenia was more severe and more frequent in the concurrent arm than in the sequential arm. However, severe esophagitis was infrequent in both arms. The radiotherapy was interrupted more frequently in the concurrent arm than in the sequential arm due to hematologic toxicities (p=0.001). CONCLUSION: This study suggests that concurrent TRT with etoposide plus cisplatin is more effective for the treatment of LS-SCLC than sequential TRT. However, there is a significant increase in the risk of toxicities, and radiotherapy was frequently interrupted in the concurrent arm due to hematologic toxicities.

An Analysis of p53, bcl-2 and Ki-67 Expressions, and Apoptosis in Rectal Cancer: Their Correlation with the Tumor Response after Preoperative Radiochemotherapy

Background : Preoperative radiochemotherapy (RCT) has been administered for locally advanced rectal cancer to increase the therapeutic benefits, and to preserve the sphincter in low-lying tumors, however, tumor responses after RCT are variable. Methods : Apoptotic index (AI), and expressions of Ki-67, p53 and bcl-2 were analyzed in pretreatment biopsies from 69 patients with rectal cancer by immunohistochemistry. Tumor response was graded in surgically resected specimens by using a three-scale grading system: no response (NR), partial remission (PR) and complete remission (CR). Results : CR was identified in 19 cases (28%), PR in 24 cases (35%), and NR in 26 cases (38%) of 69 cases. p53 protein was expressed in 49 cases (71%), whereas bcl-2 was in 42 cases (61%). The pretreatment Ki-67 labeling index was 65.4+/-3.4%. The tumor response was not associated with any of these markers. Tumors with CR/PR showed a higher AI (0.84+/-.84%/0.66+/-.52%) than that of tumors with NR (0.58+/-0.54%). There was a significant correlation between tumor response and the histologic differentiation (p=0.008) or recurrence (p=0.039). Conclusions : The AI revealed a tendency to increase in tumors with CR/PR, while expressions of p53 and bcl-2, and Ki-67 labeling index had little direct association with tumor response.

The Usefulness of Diagnostic Scan Using Technetium-99m Pertechnetate Scintigraphy prior to the First Ablative Radioiodine Treatment in Patients with Well Differentiated Thyroid Carcinoma: A Comparative Study with Iodine-131 / 대한핵의학회잡지

PURPOSE: A prospective comparison was made between imaging with Tc-99m pertechnetate (Tc-99m) and Ioine-131 (I-131) for the detection of residual and metastatic tissue after total thyroidectomy in patients with well-differentiated thyroid carcinoma. MATERALS AND METHODS: Initially our patients had imaging with Tc-99m, followed by I-131 within 3 days. The study included 21 patients who had ablation with high dose of I-131 ranging from 100 mCi to 150 mCi. Planar and pinhole images were acquired for both Tc-99m and I-131. Diagnostic images of Tc-99m and I-131 were compared with post-therapy images. Degree of uptake on Tc-99m and I-131 images was scored by four point scale and compared. RESULTS: The results of the Tc-99m study were: 16 of 19 studies (84%) were positive on simple planar images, but 19 of 20 studies (95%) were positive on pinhole images. Conventional I-131 diagnostic imaging on the other hand showed that all studies (100%) were positive on both planar and pinhole images. There was a significant difference in degree of uptake between Tc-99m and I-131 planar images (p<0.05). Only one case of Tc-99m scintigraphy was negative on both planar and pinhole studies (false negative). There was no distant metastasis on the therapeutic I-131 images. CONCLUSION: Tc-99m scan using pinhole in certain clinical situations is an alternative to the I-131 scan in detecting thyroid or lymph node metastasis prior to the first ablative treatment after thyroidectomy for well-differentiated thyroid carcinoma.

Brown Tumors Due to Parathyroid Carcinoma ; 99mTc-MIBI Scan Findings: Case Report / 대한핵의학회잡지

No abstract available.