The averages and standard deviations of several subgroups in a study are sometimes need to be combined in meta-analysis, the calculating method to do this was given in this paper. Firstly, a commonly used incorrect calculating method to do the combination was pointed out; it origins from metrology and should be applied in the combination of standard deviations of several groups of measurements of the same object, and it's not fit for the combination of several subgroups' data in meta-analysis. Meanwhile the calculating error of this method was tested with real and constructed data and its impact on the conclusion of meta-analysis was analyzed. The incorrect method may result in a big calculating error with the real research data and even lead to an incorrect conclusion with the constructed data. The correct formula was deduced and given, the calculating result of the correct formula equals the true value when neglecting the round error. The error analysis of the incorrect method was then done with the correct formula and an accurate combination result can only be got when meeting the condition given by this paper. The correct method in this paper should be used to combine standard deviations in the future researches.
ObjectiveTo investigate the effect of surgery and influence of posttreatment with non-standardized and standardized operation by reviewing and analyzing the sporadic medullary thyroid carcinoma operation cases. MethodsThe clinical data of 26 patients with sporadic medullary thyroid carcinoma treated by surgery from January 2000 to March 2013 in this hospital were analyzed retrospectively.These patients were divided into non-standardized operation group and standardized operation group (total thyroidectomy with lymph node dissection) according to the operation models.The biochemical cure rate, the complication rates of recurrent laryngeal nerve injury and hypopara-thyroidism of these two groups were investigated and compared. ResultsThe 1-year biochemical cure rate had no statistical difference between the non-standardized operation group and standardized operation group (84.21% versus 100%, χ2=1.249 4, P > 0.05), the 1-year recurrence rate was 15.79% and 0, respectively.The 5-year biochemical cure rate of the standardized operation group was significantly higher than that of the non-standardized operation group (100% versus 16.67%, χ2=4.444 4, P < 0.05).The 5-year recurrence rate was 0 and 83.33%, respectively.However, there was no obvious difference between the two groups on the injury rate of recurrent laryngeal nerve (χ2=0.070 8, P > 0.05), as well as the rate of hypoparathyroidism (χ2=2.722 7, P > 0.05). ConclusionsCompared with the non-standardized model, the standardized operation model (total thyroidectomy with lymph node dissection) shows a higher cure rate and a lower recurrent rate, and it does not increase the complication rates of hypoparathyroidism and recurrent laryngeal nerve injury
Objective To summarize the clinical and pathological manifestation, therapy, and prognosis of primary thyroid lymphoma(PTL). Methods The clinical and pathological data of 20 patients with PTL treated in our hospital from Jan.2002 to Feb.2014 were retrospectively analyzed. Results Of the 20 patients, 14 patients were female, 6 patients were male. The median age were 63.5 years old (45-77 years old). Seven patients (35.0%) were diffused large B-cell lymphoma (DLBCL), and 12 patients (60.0%) were extranodal marginal zone B-cell lymphoma of mucosa-associated lymphoid tissue (MALT) lymphoma, 1 patient (5.0%) was follicular lymphoma (FL). Twelve patients complicated with Hashimoto thyroiditis. Six patients(30.0%) accepted surgery only, 13 patients(65.0%) were supplemented with chemotherapy and (or) radiotherapy, 1 patient (5.0%) accepted chemotherapy and radiotherapy only. Two patients lost during follow-up, but 18 patients were followed-up for 6-104 months with the median time of 46.5 months. During the follow-up period, 6 patients died of PTL. The cumulative survival rates of 2-year and 5-year were 74.4% and 66.9%, respectively. Conclusion Most PTL are B-cell original non-Hodgkin lymphoma. In order to get good prognosis, chemotherapy and (or) radiotherapy are mostly needed, while surgery is performed for definitive pathological diagnosis.