Incidence of bone and soft tissue sarcoma after radiotherapy: a cohort study of 295,712 Finnish cancer patients

Radiotherapy is commonly used for treatment of malignant disease. As a consequence of radiotherapy, an increased risk of developing a second malignant neoplasm has been shown. However, little is known about the effects of radiation on developing sarcoma. The aim of this study was to examine the risk of developing a bone or soft tissue sarcoma after radiotherapy for a first primary cancer. The study population included all the patients with primary cancers of breast, cervix uteri, corpus uteri, lung, ovary, prostate, rectum and lymphoma diagnosed during 1953-2000 and identified from the Finnish Cancer Registry. Patients were followed up for subsequent sarcomas. The follow-up yielded 1.5 million person-years at risk and 147 sarcomas. Compared to the national incidence rates, after 10 years of follow-up sarcoma risk was increased among patients who had received neither radiotherapy nor chemotherapy (standardised incidence ratio (SIR) 2.0, 95% CI 1.3-3.0), radiotherapy without chemotherapy (SIR 3.2, 95% CI 2.3-4.3), chemotherapy without radiotherapy (SIR 4.9, 95% CI 1.0-14.4), as well as combined radiotherapy and chemotherapy (SIR 3.4, 95% CI 0.4-12.5). For radiotherapy in ages below 55 the SIR was 4.2 (95% CI 2.9-5.8). In the adjusted regression analysis the rate ratio was 1.5 (95% CI 0.9-2.6) for the radiotherapy group. In conclusion, radiotherapy appears to be associated with an increased risk of developing sarcoma especially among younger patients. Further investigation is needed to clarify the dose-response of the preceding ionizing radiation.     

Cancer risk after radiotherapy for breast cancer

Among women with breast cancer, we compared the relative and absolute rates of subsequent cancers in 1541 women treated with radiotherapy (RT) to 4570 women not so treated (NRT), using all registered in the Swiss Vaud Cancer Registry in the period between 1978 and 1998, and followed up to December 2002. Standardised incidence ratios (SIRs) and the corresponding 95% confidence intervals (CIs) were based on age- and calendar year-specific incidence rates in the Vaud general population. There were 11 lung cancers in RT (SIR = 1.40; 95% CI: 0.70-2.51) and 17 in NRT women (SIR = 0.76; 95% CI: 0.44-1.22), 72 contralateral breast cancers in RT (SIR = 1.85; 95% CI: 1.45-2.33) and 150 in NRT women (SIR = 1.38; 95% CI: 1.16-1.61), and 90 other neoplasms in RT (SIR = 1.37; 95% CI: 1.10-1.68) and 224 in NRT women (SIR = 1.05; 95% CI: 0.91-1.19). Overall, there were 173 second neoplasms in RT women (SIR = 1.54, 95% CI: 1.32-1.78) and 391 among NRT women (SIR = 1.13, 95% CI: 1.02-1.25). The estimates were significantly heterogeneous. After 15 years, 20% of RT cases vs 16% of NRT cases had developed a second neoplasm. The appreciable excess risk of subsequent neoplasms after RT for breast cancer must be weighed against the approximately 5% reduction of breast cancer mortality at 15 years after RT.     

Alcohol consumption and risk of colorectal cancer in a cohort of Finnish men

We investigated the association between self-reported alcohol ingestion and colorectal cancer in a cohort of male smokers in Finland. Among 27,109 men aged 50 to 69 years, 87 colon and 53 rectal cases were diagnosed during the five to eight years of follow-up. Among drinkers, colorectal cancer risk increased with the amount of alcohol consumed (P trend = 0.01) with risk increasing by 17 percent for each drink consumed. Both beer and spirits contributed to this increased risk. Further analyses revealed that the positive association with alcohol was primarily for colon cancer (P trend = 0.01). Interestingly, risk of colorectal cancer associated with drinking (cf self-reported abstinence) changed with follow-up time, suggesting an inverse association for alcohol early in follow-up, and a positive association after about three-and-a-half years of follow-up. Follow-up time did not modify the positive association with amount of alcohol among drinkers, however. Results also indicated that -carotene supplementation may attenuate the effect of alcohol on colorectal cancer risk among drinkers. In conclusion, this study supports a role for alcohol in colon carcinogenesis and suggests that similar studies should evaluate carefully the effects of lifetime drinking habits and recent abstinence.Drs Glynn, Albanes, Brown, Tangrea, and Taylor are with the Division of Cancer Prevention and Control, National Cancer Institute, Bethesda, MD, USA. Drs Pietinen, Rautalahti, and Virtamo are with the National Public Health Institute, Helsinki, Finland. Address correspondence to Dr Glynn, NCI:DCPC:CPRP:CPSB, Executive Plaza North, Suite 211, 6130 Executive Blvd. MSC 7326, Bethesda, MD 20892-7326, USA.This study was supported by a contract (NO1-CN-45165) with the US National Cancer Institute.     

Long-term aspirin use and colorectal cancer risk: a cohort study in Sweden

In a prospective cohort study of 74 250 Swedish women and men, with 7.2 years of follow-up and 705 incident colorectal cancer cases, long duration of aspirin use (>20 years) was associated with a reduced risk of colorectal cancer (multivariate rate ratio: 0.65; 95% confidence interval: 0.45-0.94). Aspirin use for a shorter period was not associated with risk.     

Quality of care experienced by Finnish cancer patients during radiotherapy

The purpose of this study is to describe patients' experiences of the quality of care received at a radiotherapy centre. The data were collected using the Good Nursing Care Scale For Patients (GNCS/P), which was modified for this study. Structured questionnaires were handed out in March-May 2004 to 150 adult curative cancer patients attending outpatient radiotherapy at a university hospital in Finland. A total of 135 completed questionnaires were returned. The patients were generally satisfied with the quality of care they received. Among the four quality categories, the highest ratings were given to staff characteristics, and the lowest to the environment. Younger patients, employed patients and those with a higher level of education gave the lowest quality ratings. Improvements are needed primarily in the counselling and education of patients and their relatives. The results of this study provide valuable clues for improving the quality of care in radiotherapy based on patients' expectations.     

Plasma microRNAs as biomarkers of pancreatic cancer risk in a prospective cohort study

Noninvasive biomarkers for early pancreatic ductal adenocarcinoma (PDAC) diagnosis and disease risk stratification are greatly needed. We conducted a nested case‐control study within the Prospective Investigation into Cancer and Nutrition (EPIC) cohort to evaluate prediagnostic microRNAs (miRs) as biomarkers of subsequent PDAC risk. A panel of eight miRs (miR‐10a, ‐10b, ‐21‐3p, ‐21‐5p, ‐30c, ‐106b, ‐155 and ‐212) based on previous evidence from our group was evaluated in 225 microscopically confirmed PDAC cases and 225 controls matched on center, sex, fasting status and age/date/time of blood collection. MiR levels in prediagnostic plasma samples were determined by quantitative RT‐PCR. Logistic regression was used to model levels and PDAC risk, adjusting for covariates and to estimate area under the receiver operating characteristic curves (AUC). Plasma miR‐10b, ‐21‐5p, ‐30c and ‐106b levels were significantly higher in cases diagnosed within 2 years of blood collection compared to matched controls (all p‐values <0.04). Based on adjusted logistic regression models, levels for six miRs (miR‐10a, ‐10b, ‐21‐5p, ‐30c, ‐155 and ‐212) overall, and for four miRs (‐10a, ‐10b, ‐21‐5p and ‐30c) at shorter follow‐up time between blood collection and diagnosis (≤5 yr, ≤2 yr), were statistically significantly associated with risk. A score based on the panel showed a linear dose‐response trend with risk (p‐value = 0.0006). For shorter follow‐up (≤5 yr), AUC for the score was 0.73, and for individual miRs ranged from 0.73 (miR‐212) to 0.79 (miR‐21‐5p).     

Skin-sparing radiation using intensity-modulated radiotherapy after conservative surgery in early-stage breast cancer: a planning study

PURPOSE: To evaluate the feasibility of skin-sparing by configuring it as an organ-at-risk (OAR) while delivering whole-breast intensity-modulated radiotherapy (IMRT) in early breast cancer. METHODS AND MATERIALS: Archival computed tomography scan images of 14 left-sided early-breast tumor patients who had undergone lumpectomy were selected for this study. Skin was contoured as a 4- to 5-mm strip extending from the patient outline to anterior margin of the breast planning target volume (PTV). Two IMRT plans were generated by the helical tomotherapy approach to deliver 50 Gy in 25 fractions to the breast alone: one with skin dose constraints (skin-sparing plan) and the other without (non-skin-sparing plan). Comparison of the plans was done using a two-sided paired Student t test. RESULTS: The mean skin dose and volume of skin receiving 50 Gy were significantly less with the skin-sparing plan compared with non-skin-sparing plan (42.3 Gy vs. 47.7 Gy and 12.2% vs. 57.8% respectively; p < 0.001). The reduction in skin dose was confirmed by TLD measurements in anthropomorphic phantom using the same plans. Dose-volume analyses for other OARs were similar in both plans. CONCLUSIONS: By configuring the skin as an OAR, it is possible to achieve skin dose reduction while delivering whole-breast IMRT without compromising dose profiles to PTV and OARs.     

Thyroid cancer risk after thyroid examination with 131I: a population-based cohort study in Sweden

Ionizing radiation is the only established cause of thyroid cancer, though the effect of diagnostic administration of (131)I on thyroid cancer risk appears minimal. The annual number of thyroid examinations using radioiodine is currently 5 per 1,000 individuals worldwide, so this issue is of public health importance. Our objective was to evaluate the excess risk of thyroid cancer following a range of known doses of (131)I administered for diagnostic purposes. We conducted a nationwide, population-based cohort study in Sweden including all 36,792 individuals who received (131)I for diagnostic purposes during 1952-1969 and were alive and free of thyroid cancer 2 years after exposure. Accrual of person-time at risk commenced 2 years after the first (131)I administration. Follow-up for cancer was to the end of 1998. Standardized incidence ratios (SIRs) were calculated as the ratio between the observed and expected numbers of thyroid cancers. Estimates were stratified by previous exposure to external radiation therapy to the neck, reason for thyroid examination, (131)I dose, sex, age at exposure and time since exposure. Thyroid cancers (n = 129) were diagnosed during 886,618 person-years at risk. Excess thyroid cancers were observed only among the 1,767 patients who reported previous external radiation therapy to the neck [SIR = 9.8, 95% confidence interval (CI) 6.3-14.6] and among those originally referred due to suspicion of a thyroid tumor (SIR = 3.5, 95% CI 2.7-4.4 for 11,015 patients without previous external radiation therapy). The 24,010 patients without previous exposure to external radiation therapy to the neck who were referred for a reason other than suspicion of a thyroid tumor received an estimated dose to the thyroid of 0.94 Gy. Among these patients, 36 thyroid cancers were observed compared to 39.5 expected (SIR = 0.91, 95% CI 0.64-1.26). We found no evidence that administration of (131)I for diagnostic purposes increases risk of thyroid cancer. However, our study included few patients under age 20, so the results apply primarily to exposure among adults. Our data suggest that protraction of dose may result in a lower risk than brief X-ray exposure of the same total dose.     

Prospective cohort study of cigarette smoking and colorectal cancer risk in women

Epidemiological studies have consistently found a positive association between cigarette smoking and risk of colorectal adenomas, so the absence of a clear association between smoking and colorectal cancer risk may seem paradoxical. However, if colorectal cancer develops only after an induction period of about 35 years, as has been proposed recently, then studies in which all subjects have fewer than about 35 years between smoking commencement and assessment of outcome would be unlikely to detect this association. Few studies have examined smoking of several decades' duration among women. Therefore, in the cohort study reported here, we used proportional hazards models to estimate hazard ratios relating cigarette smoking to colorectal cancer risk among 89,835 women aged 40-59 years at recruitment into the Canadian National Breast Screening Study, a randomized controlled trial of mammography screening for breast cancer. During an average 10.6 years of follow-up (936,433 person-years), a total of 527 women were diagnosed with incident colorectal cancer (363 colon and 164 rectal). We found that smoking was associated with increased risk of rectal cancer 30 years or more after commencement, and especially with smoking of 40 years' duration or longer (hazard ratio=3.14, 95% CI=1.33-7.42). There was little evidence for altered risk of colon cancer. These results, along with those of other recent studies, support the hypothesis that tobacco smoking is an initiator, rather than a promoter, of rectal cancer. However, the results do not support an association with colon cancer risk, even with smoking of very long duration and high intensity.     

104例初治鼻咽癌放疗的回顾性分析

目的：回顾性分析初治鼻咽癌的临床疗效和晚期损伤。方法：初治鼻咽癌患者104例,常规面颈联合野加中下颈切线野照射,鼻咽部剂量70-76Gy,中位剂量72Gy;肿大淋巴结60-70Gy,中位剂量66Gy;颈部预防剂量50Gy。62例患者接受了化疗。常规放疗后如鼻咽有肿瘤残留,则通过立体定向加量10-24Gy,颈部有淋巴结残留的观察3个月,如仍阳性行颈清扫术。生存率用Kaplan-Meier法计算,RTOG/EORTC标准评价晚期损伤。结果：中位随访时间43个月,5年局部区域控制率、无病生存率和总生存率分别为76.2%、62.8%、64.3%。I、II、Ⅲ、Ⅳa期的5年的总生存率分别为100%、86.3%、68.5%、50.2%,Ⅲ＋Ⅳa期的5年的总生存率为59.6%。共40例治疗后出现失败,失败率为38.5%,局部区域失败18例,远处转移22例,骨转移与肺转移居前两位。听力明显下降26例,占25%;味觉异常18例,占17.3%;1例出现放射性颞叶损伤;6例曾出现一过性低头触电感,未见其它放射性脊髓损伤。结论：本组鼻咽癌常规放疗5年总生存64.3%,无严重不良反应。     

Management of skin reactions during radiotherapy: a study of nursing practice

The aim of this study was to investigate the consensus of skin care advice given by nurses during radiotherapy. Sixty-seven nurses, identified through nine Belgian radiotherapy departments, responded to a questionnaire survey consisting of 58 items regarding prevention and management of erythema, dry desquamation and moist desquamation. Consensus for a given advice was categorized as small if less than 50% of the nurses gave the same answer, as moderate if between 50% and 75% and as large when more than 75%. Overall, 33% of the items showed small consensus, 29% showed moderate consensus and 38% showed large consensus. The highest consensus was seen for advice in cases of moist and dry desquamation. There was less agreement in the case of erythema and it decreased further for preventive advice. Some skin care techniques that were frequently used by the nurses cannot be supported by the literature. Also, some techniques recommended by the literature are not frequently used. Further, few differences (P < 0.05) between nurses working in a university hospital and the ones working in a non-university hospital were found in terms of advice given to patients. To increase consensus on skin care issues more conclusive research is needed. Of equal importance is the translation of existing research results into daily clinical practice.     

Timing of radiotherapy in breast-conserving therapy: a large prospective cohort study of node-negative breast cancer patients without adjuvant systemic therapy

Background:

To investigate the issue of timing of radiation therapy (RT) after lumpectomy in relation to recurrences and outcome.

Methods:

Analysis was done on 1107 breast-conserving therapies (BCT) with 1070 women, all without lymph node metastasis and without any adjuvant systemic therapy. Timing was defined as time from lumpectomy till RT. Patients were categorised into tertiles: <45 days, 45–56 days, and 57–112 days.

Results:

Local control did not show a difference between the tertiles. The distant metastasis-free survival as well as the disease-specific survival showed a decreased outcome starting the RT to early after the lumpectomy.

Conclusion:

The results of this cohort study further refines the hypothesis that timing of RT in BCT might have an impact on outcome. It suggests that a randomised trial in timing of RT in BCT seems necessary to give a definite answer.     

Adjuvant radiotherapy improves long-term survival after resection for gallbladder cancer A population-based cohort study

BackgroundData supporting routine use of adjuvant radiotherapy (RT) compared to without RT (noRT) for gallbladder cancer (GBC) is unclear. This study aimed to determine whether RT improves long-term survival following resection for GBC.MethodsPatients receiving resection for GBC followed by RT from 2004 to 2016 were identified from the National Cancer Database (NCDB). Patients with survival <6 months were excluded to account for immortal time bias. Propensity score matching (PSM) and Cox regression was performed to account for selection bias and analyze impact of RT on overall survival.ResultsOf 7514 (77%) noRT and 2261 (23%) RT, 2067 noRT and 2067 RT patients remained after PSM. After matching, RT was associated with improved survival (median: 26.2 vs 21.5 months, p < 0.001), which remained after multivariable adjustment (HR: 0.82, CI_95%: 0.76–0.89, p < 0.001). On multivariable interaction analyses, this benefit persisted irrespective of nodal status: N0 (HR: 0.84, CI_95%: 0.77–0.93), N1 (HR: 0.77, CI_95%: 0.68–0.88), N2/N3 (HR: 0.56, CI_95%: 0.35–0.91), margin status: R0 (HR: 0.85, CI_95%: 0.78–0.93), R1 (HR: 0.78, CI_95%: 0.68–0.88) and use of adjuvant chemotherapy (AC) (HR: 0.67, CI_95%: 0.57–0.79). Benefit with RT were also seen in patients with T2 - T4 disease and in patients undergoing simple and extended cholecystectomy.ConclusionRT following resection was associated with improved survival in this study, even in margin-negative and node-negative disease. These findings may suggest addition of RT into multimodality therapy for GBC.     

乳腺癌术后分阶段放疗的临床观察

目的:探讨乳腺癌术后持续化疗与不同放疗方案的最佳组合,以求在不影响全身治疗和局部复发的前提下尽可能减少放疗的肺损伤和其他毒副反应。方法:临床病例选择后,根据不同的放化疗过程分为4组(A组:化疗 锁骨上野、腋窝野及胸壁切线野同时放疗 化疗组;B组:锁骨上野、腋窝野及胸壁切线野同时放疗 化疗组;C组:化疗 锁骨上野、腋窝野及胸壁切线野同时放疗组;D组:化疗 锁骨上野、腋窝野及胸壁切线野分阶段放疗组),并进行随访追踪。所有患者治疗结束后均随访3~5年。结果:A组放射性肺损伤发生率最高,而D组发生率最低,与其他各组比较差异均有统计学意义,B、C、D组与A组比较,P值分别为0.023、0.011和0.000,D组与B、C组比较,P值分别为0.015和0.007;4组局部复发率、远处转移率、5年生存率及骨髓抑制比较,差异均无统计学意义,P>0.05;放射性皮炎发生率A组最高,D组最低,与其他各组比较差异均有统计学意义,B、C、D组与A组比较,P值分别为0.033、0.042和0.014,D组与B、C组比较,P值分别为0.023和0.019。结论:乳腺癌术后化疗同时设野分阶段放疗可明显降低放射性肺损伤及其他毒副反应发生率,且不影响局部复发率、远处转移率及5年生存率。     

Chemical exposures in the workplace and breast cancer risk: A prospective cohort study

We investigated the relationship between workplace chemical exposures and breast cancer risk among women enrolled in the Sister Study, a prospective cohort study of US and Puerto Rican women. A total of 47,640 participants reported work outside of the home. Workplace exposure to eleven agents (acids, dyes or inks, gasoline or other petroleum products, glues or adhesives, lubricating oils, metals, paints, pesticides, soldering materials, solvents and stains or varnishes) was characterized based on self‐reports of frequency and duration of use. Approximately 14% of the study population reported exposure to only one agent and 11% reported working with two or more of the 11 agents in their lifetime. Hazard ratios (HRs) and 95% confidence intervals (CIs) were estimated for each agent, adjusting for established breast cancer risk factors. During follow‐up, 1,966 cases of breast cancer were reported. Although there were no significant associations between ever use of the eleven agents evaluated and breast cancer risk, women with cumulative exposure to gasoline or petroleum products at or above the highest quartile cutoff had an elevated risk of total (HR: 2.3, 95%CI: 1.1–4.9) and invasive (HR: 2.5, 95%CI: 1.1–5.9) breast cancer compared with women in the lowest quartile group (p_trend = 0.03). Workplace exposure to soldering materials was associated with an increased risk of premenopausal breast cancer (HR = 1.8, 95% CI = 1.1–3.0). Findings support the need for further studies to elucidate the role of occupational chemicals in breast cancer etiology.     

软组织肉瘤手术加术中放疗的临床研究

目的：探讨软组织肉瘤术中放疗的意义。方法：对39例软组织肉瘤患者行根治或姑息性手术，术中放疗在术中放疗手术室进行，术中根据肿瘤大小，选择不同术中放疗限光筒及6～12MeV电子线1次照射15～25Gy，姑息手术者剂量加大至36Gy。术后辅以外照射治疗，常规设野，5／周，2Gy／次，总量40～50Gy。初发病灶10例，术后复发29例。结果：39例患者随访12～64个月，3、5年局控率分别为71．8％和64．1％。3年生存率为82．0％。结论：术中放疗具有较高的局控率，比之其他治疗具有许多优点，将获得较高的生存率。     

软组织肉瘤手术加术中放疗的临床研究

目的:探讨软组织肉瘤术中放疗的意义。方法:对39例软组织肉瘤患者行根治或姑息性手术,术中放疗在术中放疗手术室进行,术中根据肿瘤大小,选择不同术中放疗限光筒及6～12MeV电子线1次照射15～25Gy,姑息手术者剂量加大至36Gy。术后辅以外照射治疗,常规设野,5/周,2Gy/次,总量40～50Gy。初发病灶10例,术后复发29例。结果:39例患者随访12～64个月,3、5年局控率分别为71.8%和64.1%。3年生存率为82.0%。结论:术中放疗具有较高的局控率,比之其他治疗具有许多优点,将获得较高的生存率。     

Risk of cholecystitis in patients with cancer: a population-based cohort study in Denmark

BACKGROUND.

To the authors' knowledge, little information is available regarding the incidence of cholecystitis among patients with cancer.

METHODS.

The authors conducted a population‐based historical cohort study of 51,228 patients with incident cancer, identified in medical databases of western Denmark between 1995 and 2003. A general population comparison cohort of 512,280 persons was assembled using the Danish Civil Registration System. The occurrence of cholecystitis in the 2 groups was determined by linkage to the regional Hospital Discharge Registry.

RESULTS.

In all, 230 incident diagnoses of cholecystitis were identified in the cancer cohort during 130,185 person‐years (median follow‐up time: 1.6 years), corresponding to an incidence rate of 1.8 of 1000 person‐years. After adjustment for confounders, the relative risk (RR) for cholecystitis among cancer patients compared with the general population cohort was 1.38 (95% confidence interval [95% CI], 1.20‐1.58). Overall, the RR for cholecystitis was doubled during the first 6 months after cancer diagnosis (RR = 1.95; 95% CI, 1.50‐2.54), after which the RR declined but remained greater than 1 throughout the rest of the follow‐up period (RR = 1.23; 95% CI, 1.05‐1.45). Cancer patients between the ages of 51 and 70 years had the highest risk increase for cholecystitis compared with other age groups. During the first 6 months after a cancer diagnosis, pancreatic cancers (12 cholecystitis events; RR = 9.44 [95% CI, 5.18‐17.18]) and colorectal cancers (10 cholecystitis events; RR = 4.98 [95% CI, 2.65‐9.34]) were found to be associated with the greatest cholecystitis risk increase compared with other tumor types. After 6 months, most cancers were associated with a relatively small increased risk, although there was an RR of 4.72 (95% CI, 1.99‐11.21) based on 5 cholecystitis events among thyroid cancer patients.

CONCLUSIONS.

The results of the current study indicate that cholecystitis occurs more frequently among cancer patients than in the general population, particularly within the first 6 months after a cancer diagnosis. Clinicians who treat cancer patients should remain vigilant about this type of infection. Cancer 2008. © 2008 American Cancer Society.     

104例初治鼻咽癌放疗的回顾性分析

目的:回顾性分析初治鼻咽癌的临床疗效和晚期损伤.方法: 初治鼻咽癌患者104例,常规面颈联合野加中下颈切线野照射,鼻咽部剂量70-76Gy,中位剂量72Gy;肿大淋巴结60-70Gy,中位剂量66Gy;颈部预防剂量50Gy.62例患者接受了化疗.常规放疗后如鼻咽有肿瘤残留,则通过立体定向加量10-24Gy,颈部有淋巴结残留的观察3个月,如仍阳性行颈清扫术.生存率用Kaplan-Meier法计算,RTOG/EORTC标准评价晚期损伤. 结果: 中位随访时间43个月,5年局部区域控制率、无病生存率和总生存率分别为76.2%、62.8%、64.3%.Ⅰ、Ⅱ、Ⅲ、Ⅳa期的5年的总生存率分别为100%、86.3%、68.5%、50.2%,Ⅲ+Ⅳa期的5年的总生存率为59.6%.共40例治疗后出现失败,失败率为38.5%,局部区域失败18例,远处转移22例,骨转移与肺转移居前两位.听力明显下降26例,占25%;味觉异常18例,占17.3%;1例出现放射性颞叶损伤;6例曾出现一过性低头触电感,未见其它放射性脊髓损伤.结论: 本组鼻咽癌常规放疗5年总生存64.3%,无严重不良反应.     

Dietary polyunsaturated fatty acids and breast cancer risk in Chinese women: a prospective cohort study

Breast cancer is the most common cancer in women. Controversy exists regarding the role of dietary fat in breast cancer etiology. We investigated the association of dietary polyunsaturated fatty acids (PUFAs) and the ratio of n-6 PUFAs to marine-derived n-3 PUFAs with breast cancer risk in the Shanghai Women's Health Study, a prospective cohort study including 72,571 cancer-free participants at baseline. Dietary fatty acid intake was determined using food frequency questionnaires. We used Cox proportional hazards analysis to estimate the relative risks (RRs) and 95% confidence intervals (CIs) for the association of breast cancer risk with dietary fatty acids consumption. In 583,998 person-years of follow-up, we identified 712 breast cancer cases. We found no association of breast cancer risk to dietary intake of linoleic acid, arachidonic acid, α-linolenic acid or marine-derived n-3 PUFA. We found a statistically significant interaction between n-6 PUFA intake, marine-derived n-3 PUFA intake and breast cancer risk (p = 0.008). Women with lower intake (the lowest tertile) of marine-derived n-3 PUFA and higher intake (the highest tertile) of n-6 PUFA had an increase risk for breast cancer (RR = 2.06; 95% CI = 1.27-3.34) compared to women with higher intake (the highest tertile) of marine-derived n-3 PUFAs and lower intake (the lowest tertile) of n-6 PUFAs after adjusting for potential confounders. The relative amounts of n-6 PUFA to marine-derived n-3 PUFAs may be more important for breast cancer risk than individual dietary amounts of these fatty acids.