Predictors of Acute Hematologic Toxicity in Women Receiving Extended-Field Chemoradiation for Cervical Cancer: Do Known Pelvic Radiation Bone Marrow Constraints Apply?

Purpose: Patients with cervical cancer who are at high risk for para-aortic lymphatic involvement may receive extended-field chemoradiation (EF-CRT), with inclusion of the para-aortic region. Increased radiation to bone marrow (BM) may heighten hematologic toxicity (HT) and affect timely delivery of chemoradiation. Factors associated with HT in this setting have not been well studied. Methods and Materials: This study was a retrospective analysis of women treated with EF-CRT from 2012 to 2018 with platinum-based chemotherapy. Factors including age, body mass index (BMI), race, Charlson Comorbidity Index (CCI), and nadirs for white blood cell count, absolute neutrophil count, hemoglobin, and platelet count were collected. The BM metrics included V5Gy, V10Gy, V15Gy, V20Gy, V25Gy, V30Gy, V35Gy, V40Gy and V45Gy (VxGy was defined as the percentage of BM volume receiving x Gy). Hematologic toxicity was defined as grade ≥2 (Cooperative Group Common Toxicity Criteria) leukopenia, anemia, neutropenia, or thrombocytopenia. Univariate analysis (UVA) and multivariate analysis (MVA) were performed using the χ2 test, the Fisher exact test, and logistic regression. Previously published dosimetric BM constraints were examined as detailed in each respective study. Results: Fifty-two women underwent EF-CRT with cisplatin. UVA showed no association between HT and age, BMI, or CCI. When accounting for race, V5Gy ≥98% was associated with grade ≥2 leukopenia (P = .02) and grade ≥2 HT (P = .05). Most previously described radiation metrics were not reproduced in our cohort, but a similar constraint, V20Gy <70%, was associated with reduced leukopenia of grade ≥2 on UVA (P = .02) and MVA (P < .05). Conclusions: Acute HT in patients receiving EF-CRT was associated with large volumes of low-dose radiation to the BM and was also associated with race. Restricting the BM V20Gy to less than 70% to 75% may be beneficial in reducing HT, but other pelvic radiation BM constraints may not be applicable to this population.

Opioid Use in Patients With Cervical Cancer at Two Urban Medical Centers.

Purpose: Patients with cervical cancer are at high risk for opioid use. This study aimed to characterize opioid prescribing patterns at 2 urban hospitals. Methods and Materials: Data from patients with cervical cancer treated with curative intent from 2011 to 2018 were retrospectively collected. Women with unrelated chronic opioid use before diagnosis, persistent/recurrent disease at 3 months after initiation of treatment, or initiation of opioids >6 months after treatment were excluded. Demographics, disease characteristics, treatment, and outpatient prescription practices were collected. Endpoints included duration of opioid use ≥6 and ≥12 months. Results: There were 106 women included, of whom 83% received definitive radiation. Most patients (n = 91, 85.8%) received outpatient opioids. Most common timing of prescriptions were before cancer therapy (35.9%), postprocedure (26.4%), and during radiation therapy (17.0%). Median duration was 3 (interquartile range, 1-11) months; 35.2% of these patients received opioids ≥6 months and 22% received opioids ≥12 months. Greater International Federation of Gynaecology and Obstetrics (FIGO) stage, recurrent/residual disease, initiation of opioids before treatment, history of depression or anxiety, and use of gabapentin or steroids were associated with long-term opioid use. Conclusions: Most patients were prescribed outpatient opioids, many of whom used opioids for 12 months. Improvement in provider communication and education, increased posttreatment monitoring, and further evaluation of nonopioid therapies are needed in this patient population to reduce long-term opioid use.

Local Control and Use of External Beam Parametrial Boost in the Era of Image-Guided Brachytherapy for Locally Advanced Cervical Cancer.

OBJECTIVE: Historically, external beam parametrial boost (EBPB) has been used in locally advanced cervical cancers to supplement radiation dose. However, it has become controversial in the era of image-guided brachytherapy. Modern 3D imaging and brachytherapy techniques have improved delineation and coverage of tumor. Outcomes with and without parametrial boost were analyzed. METHODS: Women with cervical cancer involving the parametria (clinically or radiographically) diagnosed between 2001 and 2017 were identified. Clinicopathologic and treatment features, survival and patterns of failure data were collected. Univariate and multivariable data analysis was performed to evaluate association of these variables, including parametrial boost, with local failure-free survival and overall survival. Competing risks analysis was performed for cumulative incidence of local failure, with death and other failures treated as competing events. RESULTS: A total of 100 women were identified (median follow-up 26.8 mo). Forty-one (41%) received EBPB; these patients were less likely to have received magnetic resonance imaging, positron emission tomography, interstitial, or high-dose rate brachytherapy. Magnetic resonance imaging, positron emission tomography, dose rate, and treatment era were highly correlated (Cramer's V: 0.43 to 0.68, P<0.01). Two-year overall survival and local failure were 78% and 12% for the entire cohort. While the use of EBPB was not associated with any outcome on multivariable analysis, treatment year after 2009 was highly associated with improved outcomes in all models. CONCLUSIONS: In this study, omission of EBPB did not compromise local control or survival in the modern era, supporting a decreased need for standardized use of parametrial boost.

Interdisciplinary Oncology Education: a National Survey of Trainees and Program Directors in the United States.

Oncologists must have a strong understanding of collaborating specialties in order to deliver optimal cancer care. The objective of this study was to quantify current interdisciplinary oncology education among oncology training programs across the USA, identify effective teaching modalities, and assess communication skills training. Web-based surveys were sent to oncology trainees and program directors (PDs) across the USA on April 1, 2013 and October 8, 2013, respectively. Question responses were Yes/No, five-point Likert scales (1 = not at all, 2 = somewhat, 3 = moderately, 4 = quite, 5 = extremely), or free response. Respondents included the following (trainees/PDs): 254/55 medical oncology, 160/42 surgical oncology, 102/24 radiation oncology, and 41/20 hospice and palliative medicine (HPM). Trainees consistently reported lower rates of interdisciplinary education for each specialty compared with PDs as follows: medical oncology 57 vs. 77% (p < 0.01), surgical oncology 30 vs. 44% (p < 0.01), radiation oncology 70 vs. 89% (p < 0.01), geriatric oncology 19 vs. 30% (p < 0.01), and HPM 55 vs. 74% (p < 0.01). The predominant teaching method used (lectures vs. rotations vs. tumor board attendance vs. workshop vs. other) varied according to which discipline was being taught. The usefulness of each teaching method was rated statistically different by trainees for learning about select disciplines. Furthermore, statistically significant differences were found between PDs and trainees for the perceived usefulness of several teaching modalities. This study highlights a deficiency of interdisciplinary education among oncology training programs in the USA. Efforts to increase interdisciplinary education opportunities during training may ultimately translate into improved collaboration and quality of cancer care.

Radiation oncology medical student clerkship: implementation and evaluation of a bi-institutional pilot curriculum.

PURPOSE: To develop and evaluate a structured didactic curriculum to complement clinical experiences during radiation oncology clerkships at 2 academic medical centers. METHODS AND MATERIALS: A structured didactic curriculum was developed to teach fundamentals of radiation oncology and improve confidence in clinical competence. Curriculum lectures included: (1) an overview of radiation oncology (history, types of treatments, and basic clinic flow); (2) fundamentals of radiation biology and physics; and (3) practical aspects of radiation treatment simulation and planning. In addition, a hands-on dosimetry session taught students fundamentals of treatment planning. The curriculum was implemented at 2 academic departments in 2012. Students completed anonymous evaluations using a Likert scale to rate the usefulness of curriculum components (1=not at all, 5=extremely). Likert scores are reported as (median [interquartile range]). RESULTS: Eighteen students completed the curriculum during their 4-week rotation (University of Chicago n=13, Harvard Longwood Campus n=5). All curriculum components were rated as extremely useful: introduction to radiation oncology (5 [4-5]); radiation biology and physics (5 [5-5]); practical aspects of radiation oncology (5 [4-5]); and the treatment planning session (5 [5-5]). Students rated the curriculum as "quite useful" to "extremely useful" (1) to help students understand radiation oncology as a specialty; (2) to increase student comfort with their specialty decision; and (3) to help students with their future transition to a radiation oncology residency. CONCLUSIONS: A standardized curriculum for medical students completing a 4-week radiation oncology clerkship was successfully implemented at 2 institutions. The curriculum was favorably reviewed. As a result of completing the curriculum, medical students felt more comfortable with their specialty decision and better prepared to begin radiation oncology residency.

A national radiation oncology medical student clerkship survey: didactic curricular components increase confidence in clinical competency.

PURPOSE: Students applying to radiation oncology residency programs complete 1 or more radiation oncology clerkships. This study assesses student experiences and perspectives during radiation oncology clerkships. The impact of didactic components and number of clerkship experiences in relation to confidence in clinical competency and preparation to function as a first-year radiation oncology resident are evaluated. METHODS AND MATERIALS: An anonymous, Internet-based survey was sent via direct e-mail to all applicants to a single radiation oncology residency program during the 2012-2013 academic year. The survey was composed of 3 main sections including questions regarding baseline demographic information and prior radiation oncology experience, rotation experiences, and ideal clerkship curriculum content. RESULTS: The survey response rate was 37% (70 of 188). Respondents reported 191 unique clerkship experiences. Of the respondents, 27% (19 of 70) completed at least 1 clerkship with a didactic component geared towards their level of training. Completing a clerkship with a didactic component was significantly associated with a respondent's confidence to function as a first-year radiation oncology resident (Wilcoxon rank-sum P=.03). However, the total number of clerkships completed did not correlate with confidence to pursue radiation oncology as a specialty (Spearman ρ P=.48) or confidence to function as a first year resident (Spearman ρ P=.43). CONCLUSIONS: Based on responses to this survey, rotating students perceive that the majority of radiation oncology clerkships do not have formal didactic curricula. Survey respondents who completed a clerkship with a didactic curriculum reported feeling more prepared to function as a radiation oncology resident. However, completing an increasing number of clerkships does not appear to improve confidence in the decision to pursue radiation oncology as a career or to function as a radiation oncology resident. These results support further development of structured didactic curricula for the radiation oncology clerkship.

Management of prostate cancer recurrences after radiation therapy-brachytherapy as a salvage option.

Depending on initial prognostic factors, an estimated 10%-60% of men who undergo definitive radiation therapy for prostate cancer may experience a biochemical recurrence. Even though hormonal therapy is standard for metastatic recurrences, no consensus exists on optimal salvage therapy for those recurrences thought confined to the prostate. Salvage treatment options for these local recurrences have historically been limited to salvage prostatectomy, hormonal therapy, or cryotherapy. Salvage prostate brachytherapy, however, uses a widely available technique and may provide another option for attaining disease control in patients with localized failures, although only about 110 cases have been reported in the literature. In this report, the authors have described their own series of salvage brachytherapy cases as well as presented a review of other such series reported in the literature. In addition, the authors included a comprehensive review of published experiences with surgery and cryotherapy as salvage options. It appears that salvage brachytherapy, when combined with careful patient selection, is at least as effective as other salvage options with comparable or potentially fewer treatment-related side effects.