Mammographic Screening in Women at Increased Risk of Breast Cancer after Treatment of Hodgkin’s Disease

Best practice & research clinical haematology: Screening for breast cancer in hodgkin lymphoma survivors

Childhood and young adult survivors of Hodgkin lymphoma are at an elevated risk of developing breast cancer. Breast cancer risk is felt to originate from chest wall radiation exposure prior to the third decade of life, with incidence beginning to rise approximately eight to ten years following Hodgkin lymphoma treatment. Although incidence varies according to age at radiation exposure, dosage, and treatment fields, cohort studies have documented a cumulative incidence of breast cancer of 10-20% by 40 years of age. Women with a history of chest radiation for Hodgkin lymphoma are counselled to begin screening with bilateral breast MRI at 25 years of age, or eight years after radiation, whichever occurs later. Outside of high-risk surveillance, the optimal management approach for women with prior radiation exposure continues to evolve. When diagnosed with breast malignancy, evidence supports consideration of unilateral therapeutic and contralateral prophylactic mastectomy, although breast conserving surgery may be considered following multidisciplinary assessment. This review will address the epidemiology, characteristics, screening and management guidelines, and breast-cancer prevention efforts for Hodgkin lymphoma survivors treated with radiation therapy in adolescence and young adulthood.

Excellent results of screening for subsequent breast cancers in long-term survivors of childhood Hodgkin's lymphoma-Results of a population-based study

Introduction

Subsequent breast cancer (SBC) represents a major complication in childhood cancer survivors and screening for SBC in survivors after incidental irradiation of breasts is recommended. In this article, we report the results and discuss benefits of SBC screening in female pts treated for Hodgkin's lymphoma (HL) in Slovenia in a period of 45 years.

Methods

Between 1966 and 2010, 117 females were treated for HL under the age of 19 in Slovenia. One hundred five of them survived for 5 years and were included in our study. They were 3-18 (med. 15) years old at diagnosis and followed for 6-52 (med. 28) years. Eighty-three percent of them had chest RT with a median dose of 30 Gy. Ninety-seven (92%) of 105 pts were regularly followed according to the international guidelines including yearly screening mammography/breast MRI in those who received chest RT.

Results

We diagnosed 10 SBCs in eight pts 14-39 (med. 24) years after diagnosis at the age of 28-52 (med. 42) years. At 40 years of follow-up, cumulative incidence of SBCs in females who got chest RT was 15.2%. Seven of eight patients (with 9 SBCs) got chest RT with 24-80 (med. 36) Gy at the age of 12 to 18 (median 17) years. Two patients in this group got bilateral SBC. One patient got invasive SBC after being treated with ChT containing high-dose of anthracyclines without chest RT at the age of 13. All eight invasive SBCs were invasive ductal cancers, HER2 receptors negative, all but one with positive hormonal receptors. Six invasive cancers were of stage T1N0, one T1N1mi, only one, diagnosed before era of screening, was of T2N1. None of 8 pts died of SBC.

Conclusion

After introduction of regular breast screening in our female patients, who received chest RT in childhood, all SBCs were of early stage and no patients died of SBC. Survivors of pediatric HL should be informed about the risk of late sequelae of treatment for HL, including SBC. Regular follow-up with breast cancer screening and breast self-examination is of vital importance in those treated with chest RT.

Second Cancers in Classical Hodgkin Lymphoma and Diffuse Large B-Cell Lymphoma: A Systematic Review by the Fondazione Italiana Linfomi

BACKGROUND

The increase of lymphoma patient survival led to a modification of the incidence of long-term sequelae, including second malignancies (SM). Several groups have dealt with the incidence of SM, according to the primary treatment; however, a standardized approach for the early detection and screening of SM in the population of lymphoma survivors should be implemented.

METHODS

A systematic review was conducted by Fondazione Italiana Linfomi (FIL), in order to define the incidence of SM, the impact of modern radiotherapy on SM risk, and the usefulness of tailored follow-up and screening strategies for early diagnosis of SM. Classical Hodgkin lymphoma (cHL) and diffuse large B-cell lymphoma (DLBCL) survivors were investigated. The MEDLINE, Embase, and Cochrane Library databases were checked for relevant reports published up to January 2020. The selection process was reported according to the preferred reporting items for systematic reviews and meta-analyses (PRISMA) guidelines.

RESULTS

A total of 27 full-text manuscripts resulted as eligible for the analysis. The incidence of SM in cHL patients treated with ABVD was higher compared to the general population and was even higher in patients treated with intensified regimens. The risk increased over time, as well as after 10-15 years from therapy, and was augmented by radiotherapy exposure. In DLBCL, more intensive regimens (i.e., R-CHOEP or R-MegaCHOEP) vs. R-CHOP were associated with a higher SM incidence. Salvage chemotherapy and autologous stem cell transplants increased the risk of SM in both cHL and DLBCL cohorts. A lower incidence of SM, particularly of breast cancer (BC), was shown in cohorts of cHL survivors treated with reduced radiation volumes and doses (involved fields vs. extended fields), but robust trials are still lacking. Considering the advantage of a structured screening for early detection of SM, all the included studies regarded cHL survivors and screening strategy for early BC detection. Moreover, the authors discuss additional papers, to guide the early diagnosis of lung, colorectal, skin, and thyroid cancer in patients at risk due to family history, drug or RT exposure, or unhealthy lifestyles. These screening strategies all passed through patient awareness.

CONCLUSION

A modern approach to chemotherapy and radiotherapy led to a lower risk of SM, which should be confirmed over time. Early detection of secondary cancers could be achieved through a tailored screening program, according to the individual risk profile.

Clinicopathologic features of breast cancers diagnosed in women treated with prior radiation therapy for Hodgkin lymphoma: Results from a population-based cohort

BACKGROUND

Childhood and young adult survivors of Hodgkin lymphoma (HL) are at elevated risk of developing breast cancer, yet little data exist on the tumor characteristics that develop in this high-risk patient population.

METHODS

The National Cancer Institute's Surveillance, Epidemiology, and End Results database was used to identify breast cancers diagnosed between 1990 and 2016 in women who had received prior radiation therapy for HL at age 30 years or younger. Clinicopathologic features of subsequent breast cancers (breast cancer after radiation therapy for HL [BC-HL]) were examined and compared with breast cancers diagnosed in women who had no prior malignancy (breast cancer with no prior malignancy [BC-NPM]).

RESULTS

In total, 321 breast cancers were identified in 257 women who had a history of radiation therapy for HL. The median age at HL diagnosis was 22 years (interquartile range, 18-26 years), and nearly all patients in the BC-HL group (97.9%) were diagnosed ≥8 years after radiation therapy. Overall, 56 patients in the BC-HL group (21.8%) developed bilateral breast cancer. Compared with women who had BC-NPM, those who had BC-HL were younger (43 vs 60 years; P < .001) and were less likely to present with ductal carcinoma in situ (8.4% vs 14.9%; P = .001). On multivariable analysis that included adjustment for age, invasive BC-HL was associated with smaller (≤2 cm) tumor size (odds ratio, 1.64; 95% CI, 1.25-2.15) and upper outer quadrant tumors (odds ratio, 1.37; 95% CI, 1.04-1.81) compared with BC-NPM. In a subset analysis of 102 women who had HER2/neu status available, the distribution of biologic subtype was not significantly different between BC-HL and BC-NPM (P = .16).

CONCLUSIONS

Breast cancers in women who previously received radiation therapy for HL are characterized by earlier onset disease, although most remain estrogen receptor-positive and have early stage disease at presentation.

LAY SUMMARY

Women who have had radiation therapy for Hodgkin lymphoma at a young age are at increased risk of developing early onset breast cancer; however, most of these breast cancers are sensitive to hormones (estrogen receptor-positive) and are diagnosed at early stages. Because these breast tumors are estrogen receptor-positive, medications that prevent breast cancer by blocking the effect of or lowering hormone levels (also termed endocrine prevention) may be useful in this group of high-risk women.

Updated Breast Cancer Surveillance Recommendations for Female Survivors of Childhood, Adolescent, and Young Adult Cancer From the International Guideline Harmonization Group

PURPOSE

As new evidence is available, the International Late Effects of Childhood Cancer Guideline Harmonization Group has updated breast cancer surveillance recommendations for female survivors of childhood, adolescent, and young adult cancer.

METHODS

We used evidence-based methods to apply new knowledge in refining the international harmonized recommendations developed in 2013. The guideline panel updated the systematic literature review, developed evidence summaries, appraised the evidence, and updated recommendations on the basis of evidence, clinical judgement, and consideration of benefits versus the harms of the surveillance interventions while attaining flexibility in implementation across different health care systems. The GRADE Evidence-to-Decision framework was used to translate evidence to recommendations. A survivor information form was developed to counsel survivors about the potential harms and benefits of surveillance.

RESULTS

The literature update identified new study findings related to the effects of prescribed moderate-dose chest radiation (10 to 19 Gy), radiation dose-volume, anthracyclines and alkylating agents in non-chest irradiated survivors, and the effects of ovarian function on breast cancer risk. Moreover, new data from prospective investigations were available regarding the performance metrics of mammography and magnetic resonance imaging among survivors of Hodgkin lymphoma. Modified recommendations include the performance of mammography and breast magnetic resonance imaging for survivors treated with 10 Gy or greater chest radiation (strong recommendation) and upper abdominal radiation exposing breast tissue at a young age (moderate recommendation) at least annually up to age 60 years. As a result of inconsistent evidence, no recommendation could be formulated for routine breast cancer surveillance for survivors treated with any type of anthracyclines in the absence of chest radiation.

CONCLUSION

The newly identified evidence prompted significant change to the recommendations formulated in 2013 related to moderate-dose chest radiation and anthracycline exposure as well as breast cancer surveillance modality.

Radiation-associated breast cancers in a late-effects cohort: Long-term surveillance is essential

AIMS

Survivors of childhood, adolescent, and young adulthood malignancies have an increased risk of subsequent primary malignancies, particularly after exposure to therapeutic radiation. This study aims to evaluate the mode of surveillance and surveillance compliance, incidence and mode of detection of breast cancer, breast cancer phenotype, and outcomes after radiation-associated breast cancer (RBC) in a late-effects cohort.

METHODS

Women exposed to therapeutic radiation attending the late effects service from 1st January 2000 to 20th February 2013. All invasive and in-situ cancers, benign tumors, and deaths were evaluated. The incidence of breast cancer was compared to the Australian general population. Compliance with breast surveillance recommendations, clinicopathological features, and management of breast cancers were examined.

RESULTS

The prevalence of RBC was 17.1%. Twenty-eight cases of RBC occurred in 24 women, out of 140 women exposed to chest radiation. Patients whose first attendance was ≥15 years after radiation exposure experienced the highest incidence of RBC at 23%. The incidence of breast cancer was 11.2 times the general population (P < .001). Compliance with surveillance mammography was observed in 18.4%. Breast cancers diagnosed after the first attendance to the service were more likely screen-detected (P = .002). Most were hormone receptor positive (84.0%), invasive ductal carcinomas (82.1%), and managed with mastectomy (89.3%).

CONCLUSIONS

Patients attending a dedicated late effects service have a high burden of subsequent malignancies generally occurring after long latency. Judicious management with adherence to long-term surveillance guidelines is advocated.

Diffusion-Weighted MRI of the Breast in Women with a History of Mantle Radiation: Does Radiation Alter Apparent Diffusion Coefficient?

Objective

Fibrosis from chest irradiation could lower the apparent diffusion coefficient (ADC) of breast tissue. ADC values of normal breast tissue in high-risk women who underwent mantle radiation before age 30 years were compared with a screening control group matched for breast fibroglandular tissue (FGT).

Methods

In this retrospective study, we reviewed 21 women with a history of mantle radiation who underwent breast MRI examinations between 2008 and 2013, and 20 nonirradiated patients (control group) imaged during the same period with matching FGT and similar age. The women were dichotomized into low FGT (10/20, 50%) and high-FGT (10/20, 50%) groups, based on BI-RADS descriptors. All MRI examinations included diffusion-weighted imaging (DWI) (b = 0, 1000); ADC maps were generated and evaluated on PACS workstations by two radiologists in agreement. Region of interest markers were placed on ADC maps in visualized breast tissue in the retroareolar region of each breast. The ADC value was averaged for the right and left breast in each patient included in the study. The Wilcoxon signed-rank test was used to compare the ADC values in the irradiated patients and the matched control patients.

Results

The median breast ADC was lower in the irradiated group (1.32 × 10-3mm2/sec) than in the control group (1.62 × 10-3mm2/sec; P = 0.0089). Low FGT in the irradiated group had a lower median ADC (1.25 × 10-3mm2/sec) than it did in the control group (1.53 × 10-3mm2/sec). Irradiated high-FGT breasts had a median ADC (1.52 × 10-3mm2/sec), as compared with nonirradiated control patients with high FGT (1.82 × 10-3mm2/sec).

Conclusion

Previously irradiated breasts have lower ADC values than do nonirradiated breasts.

Breast Cancer Screening for High-Risk Patients of Different Ages and Risk - Which Modality Is Most Effective?

While the guidelines for breast cancer screening in average-risk women are well established, screening in high-risk women is not as clear. For women with BRCA1 or BRCA2 mutations, current guidelines recommend screening by clinical breast examination and mammography starting at age 30. For certain high-risk women, additional screening with magnetic resonance imaging (MRI) is encouraged. This review focuses on differentiating imaging modalities used for screening women at high-risk for breast cancer over the age of 50 by discussing the different imaging techniques, cost versus benefit, detection rates, and impact on survival. While mammography is the only imaging modality proven to reduce mortality from breast cancer, MRI is more sensitive in identifying cancers. MRI can often identify smaller malignancies at a greater resolution at an earlier stage. The use of MRI would be more cost effective as there would be less need for invasive therapeutic procedures. Research thus far has not identified an age-specific preference in imaging modality. There are no guidelines for high-risk women that specify screening with respect to age (i.e., older than 50 years old). More research is needed before screening guidelines in different age groups with various risk factors can be established.

ACR appropriateness criteria follow-up of Hodgkin lymphoma

The main objectives of follow-up studies after completion of treatment for Hodgkin lymphoma are detection of recurrence for salvage therapy and monitoring for sequelae of treatment. The focus of the follow-up shifts, with time after treatment, from detection of recurrence to long-term sequelae. A majority of recurrence is detected by history and physical examination. The yield for routine imaging studies and blood tests is low. Although routine surveillance CT scan can detect recurrence not detected by history and physical examination, its benefit in ultimate survival and cost-effectiveness is not well defined. Although PET scan is a useful tool in assessing response to treatment, its routine use for follow-up is not recommended. Long-term sequelae of treatment include secondary malignancy, cardiovascular disease, pneumonitis, reproductive dysfunction, and hypothyroidism. Follow-up strategies for these sequelae need to be individualized, as their risks in general depend on the dose and volume of radiation to these organs, chemotherapy, age at treatment, and predisposing factors for each sequela. The ACR Appropriateness Criteria are evidence-based guidelines for specific clinical conditions that are reviewed every 3 years by a multidisciplinary expert panel. The guideline development and review include an extensive analysis of current medical literature from peer-reviewed journals and the application of a well-established consensus methodology (modified Delphi) to rate the appropriateness of imaging and treatment procedures by the panel. In those instances in which evidence is either lacking or not definitive, expert opinion may be used to recommend imaging or treatment.

Recommendations for breast cancer surveillance for female survivors of childhood, adolescent, and young adult cancer given chest radiation: a report from the International Late Effects of Childhood Cancer Guideline Harmonization Group

Female survivors of childhood, adolescent, and young adult (CAYA) cancer who were given radiation to fields that include breast tissue (ie, chest radiation) have an increased risk of breast cancer. Clinical practice guidelines are essential to ensure that these individuals receive optimum care and to reduce the detrimental consequences of cancer treatment; however, surveillance recommendations vary among the existing long-term follow-up guidelines. We applied evidence-based methods to develop international, harmonised recommendations for breast cancer surveillance among female survivors of CAYA cancer who were given chest radiation before age 30 years. The recommendations were formulated by an international, multidisciplinary panel and are graded according to the strength of the underlying evidence.

Risk of second breast cancer in female Hodgkin's lymphoma survivors: a meta-analysis

BACKGROUND

Women treated for Hodgkin's lymphoma (HL) have an elevated risk of developing second breast cancer (SBC) compared with the general population. We planned this meta-analysis to quantify the long-term risk of SBC and analyze the contributing risk factors among HL survivors.

METHODS

According to predefined selection criteria, literature search identified 34 studies that were included in the analyses.

RESULTS

After eliminating overlapping or duplicate data, 957 incidences of SBC were encountered in 24,505 females with HL over a median follow-up of 14.9 years. The medians: age at the diagnosis of HL, age at diagnosis of SBC, and latency since HL treatment to the development of SBC were 23.7, 35.0, and 17.7 years, respectively. The pooled relative risk (RR) of SBC was 8.23 (95% CI, 5.43-12.47, I² = 96%), with a median absolute excess rate of 22.9 per 10,000 person-years. The RR was found inversely related to age at diagnosis of HL with the highest rate (68.7; [95%CI, 28.08-168.11], I² = 79%), occurred in young patients (≤ 15 years old), where the RR in older women (≥ 40 years old) was not significant (0.55; [95% CI, 0.09-3.52]). Analysis of RR by 5-year increments since the treatment of HL showed that the risk was highest after 15-19 years of latency (13.87; [95% CI, 7.91-24.30], I² = 89%). Analysis of the effect of treatment modalities showed that the RR rates were (4.70; [95% CI, 3.28-6.75], I² = 74%), (5.65; [95%CI, 2.94-10.88], I² = 91%), and (1.19; [95% CI, 0.50-2.82], I2 = 65%), for radiotherapy (RT) only, combined RT and chemotherapy (CT), and CT only, respectively. To investigate the demonstrated heterogeneity, meta-regression analysis was performed when feasible. In most such analyses, the natural logarithm of RR was inversely associated with age at HL diagnosis.

CONCLUSIONS

We conclude that, the current meta-analysis provided the most recent comprehensive estimate of the risk of SBC in a broad-range of HL survivors. Younger age at diagnosis proved to be a dominant risk factor. The obtained results would serve providing breast cancer screening recommendations for HL survivors.

Risk, characteristics, and prognosis of breast cancer after Hodgkin's lymphoma

PURPOSE

To assess breast cancer (BC) risk after Hodgkin's lymphoma (HL) and compare characteristics, risk of second BC, and prognosis of patients with these BCs with patients with first primary BC.

PATIENTS AND METHODS

We considered all 9,620 women with HL recorded in the Surveillance, Epidemiology and End Results dataset in 1973-2007. We calculated age-period standardized incidence ratios of BC. We compared patient, tumor, and treatment characteristics, risk of second BC, and prognosis between patients with BC after HL (n = 316) and patients with other BCs occurring during the same period (n = 450,413) using logistic regression and Cox models adjusted for confounders.

RESULTS

HL patients had a 2.4-fold higher risk for developing BC (95% confidence interval [CI], 2.2-2.7) than the general population. Age at HL diagnosis and radiation therapy influenced this risk. Compared with first primary BCs, BCs after HL were diagnosed at a younger age, at an earlier stage, were less frequently hormone receptor positive, were located more frequently in external quadrants, and were less frequently treated using radiotherapy. These patients had a higher risk (adjusted hazard ratio [HR], 2.85; 95% CI, 1.79-4.53) for developing a second BC and had a higher BC mortality risk (adjusted HR, 1.36; 95% CI, 1.05-1.76). The higher mortality risk was only partly explained by the higher occurrence rate of a second BC.

CONCLUSION

HL survivors have a higher risk for developing BC, their BCs are more aggressive, they have a higher risk for a second BC occurrence, and they have a poorer prognosis. Guidelines of care should be adapted to decrease the impact of BC in these high-risk patients.

Breast cancer occurred after Hodgkin's disease: clinico-pathological features, treatments and outcome: analysis of 214 cases

BACKGROUND

Secondary tumours (ST) represent a major concern in survivors of Hodgkin's disease (HD). Breast cancer (BC) is the most frequent ST among young treated women.

MATERIAL AND METHODS

One hundred and eighty-nine women treated for HD by radiotherapy (RT) and/or chemotherapy (CT) subsequently developed 214 BCs.

RESULTS

Median age at HD diagnosis was 25 years (34% were less than 20). Median interval between HD and BC was 18.6 years, with a 42-year median age at first BC. According to the TNM classification, there were 30 (14%) T0 (non palbable lesions), 86 (40%) T1, 56 (26%) T2, 13 (6%) T3T4 and 29 (14%) Tx. There were 25 (13.2%) contralateral BC. 160 (75%) and 15 (7%) tumours were infiltrating ductal and lobular carcinomas, 7 (3.3%) were other subtypes and 27 (22%) DCIS. The rate of axillary nodal involvement was 32%. Among 203 operated tumours, 79 (39%) were treated by breast conserving surgery (BCS), with RT in 56 (71%) cases. CT and hormonal treatment were delivered in 51% and 45% of the patients. With a 50-month median follow-up, local recurrence occurred in 12% of the tumours (9% after mastectomy, 21% after lumpectomy alone and 13.7% after lumpectomy with RT). Metastasis occurred in 47 (26%) patients. The risk factors were pN+, pT, high SBR grade and young age (< 50 years). The ten-year overall and specific survival rates were 53% and 63.5%, respectively. The ten-year specific survival rates were 79% for pT0T1T2, 48% for pT3T4 (p = 0.0002) and 79% for pN0 versus 38.5% for pN+ (p = 0.00026). Among 67 deaths, 43 (73%) were due to BC.

CONCLUSION

Patients and physicians should be aware that BC is the most frequent secondary tumour in young women treated for HD. The new RT modalities (lower doses and involved fields) may decrease the risk in the future. However, these women require a careful monitoring as from 8 to 10 years after HD treatment, combining mammography, ultrasound and MRI according to several ongoing studies. BC with whole breast irradiation is feasible in some selected cases.

ACR Appropriateness Criteria: follow-up of Hodgkin's lymphoma

In the follow-up of Hodgkin's lymphoma patients, the focus in the first 5 years is to detect recurrence, while after 5 years, the focus is on limiting and detecting late effects of treatment. In the first 5 years post-treatment, routine history and physical and computed tomography (CT) imaging (more frequent in the first 2 years) are generally appropriate. However, there are limited data to support the role of positron emission tomography scanning as routine follow-up. Beyond 5 years post-treatment, annual history and physical is appropriate, although there is no longer a role for routine imaging for recurrences. Women irradiated to the chest area at a young age (<35) would benefit from annual mammogram screening given the increased breast cancer risk. Magnetic resonance imaging can be considered, although there is a lack of data supporting its role in this population. Low-dose chest CT for lung cancer screening in patients with history of mediastinal irradiation and/or alkylating chemotherapy exposures and a smoking history can be considered, although data on its utility is lacking. Cardiac screening with echocardiogram and exercise tolerance tests in patients with history of mediastinal irradiation and/or adriamycin exposure may be appropriate, although the optimal screening interval would depend on mediastinal dose, adriamycin dose, presence of other cardiac risk factors and findings at the baseline screening. Patients at risk for cardiac disease due to treatment exposure would also benefit from lipid screening every 1-3 years.

Systematic review: surveillance for breast cancer in women treated with chest radiation for childhood, adolescent, or young adult cancer

BACKGROUND

Women treated with therapeutic chest radiation may develop breast cancer.

PURPOSE

To summarize breast cancer risk and breast cancer surveillance in women after chest radiation for pediatric or young adult cancer.

DATA SOURCES

Studies from MEDLINE, EMBASE, the Cochrane Library, and CINAHL (1966 to December 2008).

STUDY SELECTION

Articles were selected to answer any of 3 questions: What is the incidence and excess risk for breast cancer in women after chest radiation for pediatric or young adult cancer? For these women, are the clinical characteristics of breast cancer and the outcomes after therapy different from those of women with sporadic breast cancer in the general population? What are the potential benefits and harms associated with breast cancer surveillance among women exposed to chest radiation?

DATA EXTRACTION

Three investigators independently extracted data and assessed study quality.

DATA SYNTHESIS

Standardized incidence ratios ranged from 13.3 to 55.5; cumulative incidence of breast cancer by age 40 to 45 years ranged from 13% to 20%. Risk for breast cancer increased linearly with chest radiation dose. Available limited evidence suggests that the characteristics of breast cancer in these women and the outcomes after diagnosis are similar to those of women in the general population; mammography can detect breast cancer, although sensitivity is limited.

LIMITATION

The quality of evidence for key questions 2 and 3 is limited by substantial study heterogeneity, variation in study design, and small sample size.

CONCLUSION

Women treated with chest radiation have a substantially elevated risk for breast cancer at a young age, which does not seem to plateau. In this high-risk population, there seems to be a benefit associated with early detection. Further research is required to better define the harms and benefits of lifelong surveillance.

Systematic review: surveillance for breast cancer in women treated with chest radiation for childhood, adolescent, or young adult cancer

BACKGROUND

Women treated with therapeutic chest radiation may develop breast cancer.

PURPOSE

To summarize breast cancer risk and breast cancer surveillance in women after chest radiation for pediatric or young adult cancer.

DATA SOURCES

Studies from MEDLINE, EMBASE, the Cochrane Library, and CINAHL (1966 to December 2008).

STUDY SELECTION

Articles were selected to answer any of 3 questions: What is the incidence and excess risk for breast cancer in women after chest radiation for pediatric or young adult cancer? For these women, are the clinical characteristics of breast cancer and the outcomes after therapy different from those of women with sporadic breast cancer in the general population? What are the potential benefits and harms associated with breast cancer surveillance among women exposed to chest radiation?

DATA EXTRACTION

Three investigators independently extracted data and assessed study quality.

DATA SYNTHESIS

Standardized incidence ratios ranged from 13.3 to 55.5; cumulative incidence of breast cancer by age 40 to 45 years ranged from 13% to 20%. Risk for breast cancer increased linearly with chest radiation dose. Available limited evidence suggests that the characteristics of breast cancer in these women and the outcomes after diagnosis are similar to those of women in the general population; mammography can detect breast cancer, although sensitivity is limited.

LIMITATION

The quality of evidence for key questions 2 and 3 is limited by substantial study heterogeneity, variation in study design, and small sample size.

CONCLUSION

Women treated with chest radiation have a substantially elevated risk for breast cancer at a young age, which does not seem to plateau. In this high-risk population, there seems to be a benefit associated with early detection. Further research is required to better define the harms and benefits of lifelong surveillance.

The UK national breast cancer screening programme for survivors of Hodgkin lymphoma detects breast cancer at an early stage

Background:

Supradiaphragmatic radiotherapy (SRT) to treat Hodgkin's lymphoma (HL) at a young age increases the risk of breast cancer (BC). A national notification risk assessment and screening programme (NRASP) for women who were treated with SRT before the age of 36 years was instituted in the United Kingdom in 2003. In this study, we report the implementation and screening results from the largest English Cancer Network.

Methods:

A total of 417 eligible women were identified through cancer registry/hospital databases and from follow-up (FU) clinics. Screening results were collated retrospectively, and registry searches were used to capture BC cases.

Results:

Of the 417 women invited for clinical review, 243 (58%) attended. Of these 417 women, 23 (5.5%) have been diagnosed with BC, a standardised incidence ratio of 2.9 compared with the age-matched general population. Of five invasive BCs diagnosed within the NRASP, none involved axillary lymph nodes compared with 7 of 13 (54%) diagnosed outside the programme (P<0.10). The mean latency for BC cases was 19.5±8.35 years and the mean FU duration for those unaffected by BC was 14.6±9.11 years (P<0.01), suggesting that those unaffected by BC remain at high risk. Recall and negative biopsy rates were acceptable (10.5 and 0.8%, respectively).

Conclusions:

The NRASP appears to detect BC at an early stage with acceptable biopsy rates, although numbers are small. Determination of NRASP results on a national basis is required for the accurate evaluation of screening efficacy in women previously treated with SRT.

The addition of radiotherapy to chemotherapy does not improve outcome of early stage Hodgkin's lymphoma patients: a retrospective long-term follow-up analysis of a regional Italian experience

We retrospectively reviewed 139 stage I-II HL patients who were diagnosed and followed up in an Italian northern region (Liguria) from 1995 to 2007, and who received either chemotherapy (CT) alone (mainly doxorubicin, bleomycin, vinblastine, and dacarbazine; ABVD) or a combined modality treatment (chemotherapy + radiotherapy, CT + RT). The two therapeutic groups were comparable for clinical and histologic features. Complete remission rate after CT + RT was higher than what was achieved with CT alone (96% vs. 84%, respectively, p = 0.03). Relapse rate (12%) was the same in both groups and disease-free survival curves were comparable (82% and 83%, p = 0.47). The overall survival of the two therapeutic groups is comparable. No second tumors have been reported among patients receiving chemotherapy alone, whereas a second neoplasia has been diagnosed in four patients (in two cases possibly radiotherapy related) in the CT + RT group (5%, p = 0.09) In conclusion, our retrospective study shows that CT + limited RT is an effective and well-tolerated option for early stage Hodgkin's lymphoma, even if the use of RT is associated with a certain risk of developing a second tumor. However, four to six courses of ABVD can lead to similar, optimal, long-term disease control without exposing patients to the risk of a second neoplasia.

Breast cancer surveillance practices among women previously treated with chest radiation for a childhood cancer

CONTEXT

Women treated with chest radiation for a pediatric malignancy have a significantly increased risk of breast cancer at a young age and are recommended to have an annual screening mammogram starting at age 25 years or 8 years after radiation, whichever occurs last.

OBJECTIVE

To characterize the breast cancer surveillance practices among female pediatric cancer survivors who were treated with chest radiation and identify correlates of screening.

DESIGN, SETTING, AND PARTICIPANTS

Between June 2005 and August 2006, a 114-item questionnaire was administered to a random sample of 625 women aged 25 through 50 years who had survived pediatric cancer, who had been treated with chest radiation, and who were participating in the Childhood Cancer Survivor Study (CCSS), a North American cohort of long-term survivors diagnosed from 1970-1986. Comparisons were made with similarly aged pediatric cancer survivors not treated with chest radiation (n = 639) and the CCSS siblings cohort (n = 712).

MAIN OUTCOME MEASURE

Screening mammogram within the previous 2 years.

RESULTS

Of 1976 cancer survivors and siblings who were contacted, 87.9% participated. Among the 551 women with a history of chest radiation, 55% reported a screening mammogram in the past 2 years (ages 25-39 years, 36.5%; 95% confidence interval [CI], 31.0%-42.0%; ages 40-50 years, 76.5%; 95% CI, 71.3%-81.7%). In comparison, 40.5% of survivors without chest radiation and 37.0% of CCSS siblings reported a screening mammogram in the same time interval. Notably, among women with a history of chest radiation, 47.3% (95% CI; 41.6%-53.0%) of those younger than 40 years had never had a mammogram and only 52.6% (95% CI; 46.4%-58.8%) of women aged 40 through 50 years were being regularly screened (2 mammograms within 4 years). Screening rates were higher among women who reported a physician recommendation than those who did not (ages 25-39 years, 76.0% vs 17.6%; ages 40-50 years, 87.3% vs 58.3%). In multivariate models, the association was particularly strong for younger women (ages 25-39 years, prevalence ratio [PR], 3.0; 95% CI, 2.0-4.0; ages 40-50 years, PR, 1.3; 95% CI, 1.1-1.6).

CONCLUSIONS

In this cohort of women who had childhood cancer treated with chest radiation, 63.5% of those aged 25 through 39 years and 23.5% of those aged 40 through 50 years had not had mammography screening for breast cancer within the previous 2 years despite a guideline recommendation that survivors of childhood cancer who were treated with chest radiation should undergo annual screening mammography.