为提高乳房形态的识别精度,采用密度峰值聚类算法(clustering by fast search and find of density peaks,CFSFDP)对西部地区108位19~27岁青年女性的乳房形态进行聚类分析,再运用广义回归神经网络(GRNN)和概率神经网络(PNN)算法识别乳...为提高乳房形态的识别精度,采用密度峰值聚类算法(clustering by fast search and find of density peaks,CFSFDP)对西部地区108位19~27岁青年女性的乳房形态进行聚类分析,再运用广义回归神经网络(GRNN)和概率神经网络(PNN)算法识别乳房形态。结果表明:西部青年女性乳房形态可分为标准型、丰满型、扁瘦型、高挺型4种;标准型样本占比最大,丰满型的样本则偏少;乳平围对乳房识别意义重大;GRNN及PNN算法对乳房的识别精确率均较高,分别为88.89%和100%,但PNN模型整体优于GRNN模型。展开更多
To study the local recurrence and the role of whole breast radiotherapy for early breast cancer treated by conservative surgery. METHODS From April 1990 to December 2000, 49 patients with early primary breast cancer w...To study the local recurrence and the role of whole breast radiotherapy for early breast cancer treated by conservative surgery. METHODS From April 1990 to December 2000, 49 patients with early primary breast cancer were treated by conservative surgery in our hospital. The cases were comprised of Stage 0, 1; Stage Ⅰ, 31; and Stage Ⅱa, 17. Forty cases underwent quadrantectomy plus axillary lymph node dissection, and the other 9 cases had lumpectomy alone. Irradiation, which was received by 39 patients, was administered by using low tangential half fields with 6 MV X-ray to decrease the pulmonary irradiative volume. The dose to the whole breast was 45 Gy/22 ～23f/4.5W, then a 15 Gy boost dose was delivered to the tumor bed by an electron beam. The other patients underwent an irradiated regional field according to postoperative pathology. RESULTS All patients were followed-up for 10 years or more. The 10- year local recurrence rates, distant metastasis rates and survival rates were 6.1%, 4.1% and 98.0% respectively. All of the 3 patients who had a local recurrence had infiltrative carcinomas and negative lymph nodes. The 10-year local recurrence rate was higher （2.6% vs. 20.0%） with nonpostoperative whole breast radootherapy, but the statistical difference was not marked because of the low number of cases. All of the recurrent lesions localized within 3 cm of the primary lesion. CONCLUSION Original recurrence of the tumor was the main type of local recurrence. Radiotherapy after conservative surgery is very essential. After conservative surgery it is feasible that irradiation can be delivered alone to the neighboring region of the tumor bed. Partial breast radiotherapy can substitute for whole breast radiotherapy.展开更多
文摘为提高乳房形态的识别精度,采用密度峰值聚类算法(clustering by fast search and find of density peaks,CFSFDP)对西部地区108位19~27岁青年女性的乳房形态进行聚类分析,再运用广义回归神经网络(GRNN)和概率神经网络(PNN)算法识别乳房形态。结果表明:西部青年女性乳房形态可分为标准型、丰满型、扁瘦型、高挺型4种;标准型样本占比最大,丰满型的样本则偏少;乳平围对乳房识别意义重大;GRNN及PNN算法对乳房的识别精确率均较高,分别为88.89%和100%,但PNN模型整体优于GRNN模型。
文摘To study the local recurrence and the role of whole breast radiotherapy for early breast cancer treated by conservative surgery. METHODS From April 1990 to December 2000, 49 patients with early primary breast cancer were treated by conservative surgery in our hospital. The cases were comprised of Stage 0, 1; Stage Ⅰ, 31; and Stage Ⅱa, 17. Forty cases underwent quadrantectomy plus axillary lymph node dissection, and the other 9 cases had lumpectomy alone. Irradiation, which was received by 39 patients, was administered by using low tangential half fields with 6 MV X-ray to decrease the pulmonary irradiative volume. The dose to the whole breast was 45 Gy/22 ～23f/4.5W, then a 15 Gy boost dose was delivered to the tumor bed by an electron beam. The other patients underwent an irradiated regional field according to postoperative pathology. RESULTS All patients were followed-up for 10 years or more. The 10- year local recurrence rates, distant metastasis rates and survival rates were 6.1%, 4.1% and 98.0% respectively. All of the 3 patients who had a local recurrence had infiltrative carcinomas and negative lymph nodes. The 10-year local recurrence rate was higher （2.6% vs. 20.0%） with nonpostoperative whole breast radootherapy, but the statistical difference was not marked because of the low number of cases. All of the recurrent lesions localized within 3 cm of the primary lesion. CONCLUSION Original recurrence of the tumor was the main type of local recurrence. Radiotherapy after conservative surgery is very essential. After conservative surgery it is feasible that irradiation can be delivered alone to the neighboring region of the tumor bed. Partial breast radiotherapy can substitute for whole breast radiotherapy.
