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Hematuria following stereotactic body radiation therapy (SBRT) for clinically localized prostate cancer

Radiation Oncology volume 10, Article number: 44 (2015) Cite this article

Abstract

Background

Hematuria following prostate radiotherapy is a known toxicity that may adversely affect a patient’s quality of life. Given the higher dose of radiation per fraction using stereotactic body radiation therapy (SBRT) there is concern that post-SBRT hematuria would be more common than with alternative radiation therapy approaches. Herein, we describe the incidence and severity of hematuria following stereotactic body radiation therapy (SBRT) for prostate cancer at our institution.

Methods

Two hundred and eight consecutive patients with prostate cancer treated with SBRT monotherapy with at least three years of follow-up were included in this retrospective analysis. Treatment was delivered using the CyberKnife® (Accuray) to doses of 35–36.25 Gy in 5 fractions. Toxicities were scored using the CTCAE v.4. Hematuria was counted at the highest grade it occurred in the acute and late setting for each patient. Cystoscopy findings were retrospectively reviewed. Univariate and multivariate analyses were performed. Hematuria-associated bother was assessed via the Expanded Prostate Index Composite (EPIC)-26.

Results

The median age was 69 years with a median prostate volume of 39 cc. With a median follow-up of 48 months, 38 patients (18.3%) experienced at least one episode of hematuria. Median time to hematuria was 13.5 months. In the late period, there were three grade 3 events and five grade 2 events. There were no grade 4 or 5 events. The 3-year actuarial incidence of late hematuria ≥ grade 2 was 2.4%. On univariate analysis, prostate volume (p = 0.022) and history of prior procedure(s) for benign prostatic hypertrophy (BPH) (p = 0.002) were significantly associated with hematuria. On multivariate analysis, history of prior procedure(s) for BPH (p < 0.0001) and α1A antagonist use (p = 0.008) were significantly associated with the development of hematuria.

Conclusions

SBRT for prostate cancer was well tolerated with hematuria rates comparable to other radiation modalities. Patients factors associated with BPH, such as larger prostate volume, alpha antagonist usage, and prior history of procedures for BPH are at increased risk for the development of hematuria.

Background

Radiation-induced hematuria is common after prostate cancer treatment due to the close proximity of the bladder and urethra to the prostate [1]. However, the incidence of clinically significant (≥ grade 2) late gross hematuria after conventionally fractionated external beam radiation therapy is generally < 5%. Hematuria commonly occurs within the first three years following treatment but may occur many years later [2-4]. In addition, hematuria is a common clinical problem even in those without a history of radiation treatment [5,6] and can be caused by urinary tract infections, urolithiasis, benign prostatic enlargement (BPH) and urologic malignancy. As hematuria can be a sign of serious genitourinary disease, the evaluation includes cystoscopy and imaging of the upper urinary tract. Approximately 20% of patients with gross hematuria are found to have a tumor of the urinary tract [6].

The risk of radiation-induced hematuria is dependent upon both the total radiation dose and the volume of the urethra/bladder neck in the high dose area [7]. Treatment related factors such as utilization of brachytherapy [8,9] or concurrent androgen deprivation therapy [10] may impact the risk of hematuria. Patient characteristics, such as a history of prior urethral procedures [10-12] and/or chronic anticoagulation therapy may increase an individual patient’s risk of clinically significant hematuria [13]. Whether hypofrationated radiation therapy is safe in these high risk populations is yet to be explored.

Clinical data suggest that hypofractionated radiation therapy may be radiobiologically favorable to smaller fraction sizes in prostate cancer radiotherapy [14]. The α/β for prostate cancer may be as low as 1.5 Gy [14]. If the α/β for prostate cancer is less than 3 Gy, which is generally the value accepted for late urinary complications, the linear-quadratic model predicts that delivering large radiation fraction sizes will result in improved local control with a similar rate of urinary complications. Early data for high dose rate brachytherapy monotherapy reveals that such regimens are effective without undue urinary toxicity [15].

Stereotactic body radiation therapy (SBRT) is a relatively new approach that is emerging as a standard treatment option for prostate cancer [16,17]. SBRT uses even larger daily fractions of radiation (7–9 Gy) to take advantage of this postulated radiobiological advantage. Emerging data suggest that this approach may provide similar clinical outcomes as other radiation modalities with high rates of biochemical control and low rates of grade 3 and higher toxicities [16,17]. Based on patient preference for a shorter treatment course, SBRT utilization is likely to increase as long as toxicity is acceptable. Here, we present our institutional hematuria rates following SBRT for clinically localized prostate cancer.

Methods

Patient selection

Georgetown University Hospital established its Prostate SBRT Program in 2006. As of December 2013, 700 prostate cancer patients have been treated with SBRT alone (monotherapy) or as a boost after conventionally fractionated external beam radiation therapy. A small subset of these patients also received androgen deprivation therapy (ADT) at the discretion of the treating radiation oncologist or the patient’s urologist. At the inception of our program, a prospective database was established to record baseline patient characteristics. At each follow-up visit, toxicity and quality of life data have also been prospectively collected and recorded. Patients eligible for this study were those who had SBRT monotherapy with or without ADT for clinically localized prostate cancer. Internal Review Board (IRB) approval was obtained for retrospective review of our database.

SBRT treatment planning and delivery

SBRT treatment planning and delivery were conducted as previously described (Figure 1) [18,19]. Four gold markers were placed into the prostate 5–7 days prior to simulation. Patients were simulated with an empty bladder. Fused computed tomography (CT) and magnetic resonance (MR) images were used for treatment planning. The clinical target volume (CTV) included the prostate and the proximal seminal vesicles. Intrafraction image-guidance was employed to minimize the required PTV treatment margins [20]. The PTV equaled the CTV expanded 3 mm posteriorly and 5 mm in all other dimensions. The prescription dose was 35–36.25 Gy to the PTV delivered in five fractions of 7–7.25 Gy corresponding to a tumor EQD2 of approximately 85–90 Gy assuming an alpha/ beta ratio of 1.5. The prescription isodose line was limited to ≥ 75%, which limited the maximum prostatic urethra dose to 133% of the prescription dose. The bladder was contoured and evaluated with dose-volume histogram analysis during treatment planning using Multiplan (Accuray Inc., Sunnyvale, CA) inverse treatment planning. The empty bladder volume receiving 37 Gy was limited to < 10 cc in all patients. The bladder dose-volume histogram (DVH) goals were < 40% bladder volume receiving 50% of the prescribed dose and < 10% receiving 100% of the prescribed dose. To minimize the risk of local recurrence, the dose to the prostatic urethra was not constrained [21].

Figure 1
figure 1

Treatment plan. (a) Axial T2-weighted MR image demonstrating central simple prostatectomy defect (arrow). (b) Treatment planning axial CT images demonstrating the prostate (red line). Isodose lines shown as follows: 115% of the prescription dose, pink line; 100% of the prescription dose, blue line: 75% of the prescription dose, orange line; and 50% of the prescription dose, green line.

Full size image

Follow-up and statistical analysis

Hematuria was prospectively documented at follow-up visits using the National Cancer Institute (NCI) Common Toxicity Criteria (CTC) version 4.0. Acute hematuria was defined as experiencing toxicity within 3 months of radiation therapy. Late hematuria was defined as occurring at least 3 months after delivery of radiation therapy. If a hematuria episode occurred at a time point falling between follow-ups, it was counted at the later follow-up. Grade 1 represents minimal bleeding not requiring medications for symptom control. Grade 2 indicates hematuria requiring new medication (i.e. finasteride, aminocaproic acid). Grade 3 indicates hematuria requiring surgical intervention (i.e. coagulation, TURP). Hematuria evaluations were performed at the discretion of the patient’s urologist [5] and cystoscopy findings were retrospectively reviewed.

Patients completed the Expanded Prostate Cancer Index Composite (EPIC)-26 [22] before treatment and during routine follow-up visits one month after the completion of SBRT, every 3 months for the first year and then every 6 months for the second and third years. Bother due to hematuria was assessed via question 4c of the EPIC-26 (How big a problem, if any, has bleeding with urination been for you during the last four weeks?) [22]. The responses were grouped into three clinically relevant categories (no problem, very small-small problem and moderate to big problem).

Categorical demographic and disease related factors such as age, race, risk groups, procedures for benign prostate hypertrophy (BPH) (yes or no), baseline AUA scores, Charlson Cormobidity Index (CCI) at baseline, and anticoagulant usage (aspirin, clopidogrel, or warfarin) prior to treatment (yes or no) were compared using Chi-square analysis between patients reported hematuria during follow-up and those who did not. Multivariate analysis was performed using Cox’s proportional hazard regression model. All calculations were performed using SPSS v. 22 (IBM).

Results

From February 2008 to August 2011, 208 prostate cancer patients were treated per our institutional SBRT monotherapy protocol (Table 1). The median follow-up was 48 months (range, 36–60). They were ethnically diverse with 45.2% being of non-Caucasian ancestry and a median age of 69 years (48–90). Comorbidities were common with 32.2% taking anticoagulants prior to treatment. The median prostate volume was 39 cc (11.6-138.7), 27.4% of patients utilized alpha-antagonists prior to SBRT and 11.5% had prior procedures for benign prostatic hyperplasia (BPH). By D’Amico classification, 82 patients were low-, 109 intermediate-, and 17 high-risk. Thirty patients (14.4%) also received androgen deprivation therapy. The majority of the patients (87.5%) were treated with 36.25 Gy in five 7.25 Gy fractions.

Table 1 Baseline patient characteristics and treatment
Full size table

Baseline hematuria was uncommon. A total of 38 (18.3%) patients reported at least one episode of hematuria following SBRT. The median time to hematuria was 13.5 months (range, 5–22). Twenty nine patients reported a single episode (five of these were in the acute setting) and 9 patients reported multiple episodes. Eleven (5.4% of all patients) patients reported acute bleeding and 24 (11.8% of all patients) patients reported late bleeding. In the acute setting, there were two grade 2 toxicities. In the late period, there were five grade 2 events and three grade 3 events. There were no grade 4 or 5 events anytime during follow-up. No patient required a blood transfusion or hyperbaric oxygen. The 3-year actuarial incidence of late hematuria ≥ grade 2 was 2.4%. Hematuria had resolved in 95% of patients by the subsequent follow-up. Interestingly, of the grade 2–3 events, five patients had a history of transurethral resection of the prostate (TURP) or similar procedure prior to SBRT.

On univariate analysis, prostate volume (p = 0.022) and history of prior procedure(s) for BPH (p = 0.002) were significantly associated with hematuria. On multivariate analysis, history of prior procedure(s) for BPH (p ≤ 0.0001) and α1A antagonist use (p = 0.008) were significantly associated with the development of hematuria (Table 2). No other baseline patient characteristics were significantly associated with hematuria following SBRT.

Table 2 Impact of patient characteristics and treatment on hematuria incidence within three years post-SBRT
Full size table

Nineteen patients had one or more cystoscopies during the follow-up period. The median interval from completion of SBRT to cystoscopy was 24 months (range, 5–42 months). Radiation was the causative factor in 11 (60%) of these patients. The most common radiation associated findings on cystoscopy were hyperemia of the bladder neck/prostatic urethra (Table 3). Minor coagulation was performed in 2 patients. Three patients were found to have a bladder cancer at 18, 30, and 36 months after SBRT.

Table 3 Patients with hematuria who underwent cystoscopy
Full size table

At baseline, 3% of our cohort reported some level of annoyance due to hematuria; however, only one patient felt it was a moderate to big problem (Table 4). Hematuria bother increased following treatment and peaked at 9 months post treatment with 2.7% of patients reporting that it was a moderate to big problem (Table 4). Hematuria bother declined quickly and returned to baseline by three years after SBRT with 1.3% of men feeling that their hematuria was a moderate to big problem three years post-SBRT (Table 4).

Table 4 Hematuria bother following SBRT for prostate cancer (patient-reported responses to question 4c of the EPIC-26)
Full size table

Discussion

To our knowledge, this is the first study to report cystoscopy findings and the incidence of hematuria following SBRT monotherapy for prostate cancer. Hematuria was uncommon at any time point and transient in most instances. The prevalence of patient reported hematuria peaked at 9 months and resolved spontaneously without recurrence. Despite the high biochemical equivalent dose delivered by SBRT in this series, these results are similar to conventionally fractionated EBRT and brachytherapy with published studies reporting rates of hematuria that range from 2.6% - 14% [23-26,9].

The etiology of late hematuria following prostate cancer radiation therapy is multi-factorial [27]. Urolithiasis, benign prostatic enlargement (BPH) and urologic malignancy were the most common non-radiation associated causes in our patients. Previous studies have also reported that hematuria due to radiation therapy is associated with pretreatment factors related to BPH such as a high AUA score, large prostate volume, and pre-radiation TURP [28]. Our data also supports these conclusions since history of a TURP or similar procedure, α1A antagonist use, and increasing prostate volume were significantly associated with the development of post-radiation hematuria. One patient who experienced a grade 3 hematuria had a history of benign prostatic hypertrophy with a large prostate and two prior TURP procedures prior to receiving SBRT [18].

It has been well documented that pre-treatment TURP, especially if done very close to radiation, increases the risk of other late urinary toxicities such as stricture and incontinence [11,29,30]. This is thought to be caused by devascularization of the urethra after TURP and the lessened ability of the mucosa to repair sublethal radiation damage [30]. In addition, the anatomy of the prostate base is altered after a TURP resulting in broadening of the base; therefore, the treatment volume at the bladder interface may include a larger part of the bladder neck in the PTV [29].

Patients in our study with hematuria secondary to radiation, who underwent cystoscopy, often had some degree of bladder neck and/or prostatic urethra edema and hypervascularity supporting the above hypotheses. These cystoscopy findings have also been observed in patients with hematuria after prostate brachytherapy [25]. In an effort to decrease the incidence of bladder neck and prostatic urethra pathology, we have reduced the central dose in our relatively inhomogenous plans [18]. It is expected, that with these modifications, the risk of hematuria will decline.

Interestingly, in our study, we did not find an association between anticoagulation usage and hematuria as previously reported by others [13]. One possible explanation is that we also included aspirin (low or high dose), along with clopidogrel and warfarin in the analysis, whereas most only include the latter two. Aspirin, especially low dose, may not predispose patients to bleeding as strongly as warfarin or clopidogrel and may explain the discrepancy.

In this study, the PTV included the prostate and proximal seminal vesicles with margin regardless of risk group, as do many [31-34]. This is in contrast to the Radiation Therapy Oncology Group (RTOG), which recommends inclusion of the prostate only with margin in the PTV for low risk prostate cancer. How the inclusion of the proximal seminal vesicles affects the risk of hematuria is unknown. A prior publication has demonstrated that increasing the volume of the seminal vesicles included in the PTV would only have a moderate increase in normal tissue complication probability (NTCP) [35].

Hematuria following prostate cancer treatment is also a quality of life issue [36]. Bother is defined as the degree of interference or annoyance caused by a symptom [37,38]. In this series, moderate to severe bother with hematuria was uncommon. During the first two years following SBRT, 1-2% of men reported hematuria bother as a moderate to big problem at any given follow-up. This change is comparable to with conventionally fractionated radiation therapy and brachytherapy [36,39].

Three patients were diagnosed with bladder tumors (1.4% of patients) at a median time of 30 months. These results are consistent with those reported following conventionally fractionated external radiation therapy and brachytherapy [40,41]. Likely, these early bladder tumors were discovered due to increased surveillance and were unlikely caused by SBRT due to the short interval to development from treatment. The cystoscopy reports were available for two of the three patients. One patient had a non-muscle invasive tumor of the right lateral wall. The second patient developed recurrent superficial papillary tumors throughout the bladder. Nonetheless, our results emphasize the importance of cancer screening in patients who report gross hematuria following SBRT. Longer follow-up will be required to identify the true incidence of SBRT-associated bladder tumors.

Our study has several limitations. We present the self-reported hematuria incidence. As most men did not undergo regular urinalysis during follow-up, the true incidence of post-SBRT hematuria may be underestimated in this study. Likewise, most hematuria events were transient and associated bother may have been missed due to the timing of questionnaire administration [42]. Furthermore, only a subset of patients underwent cystoscopy. Therefore, the cause of hematuria is not known for all patients who reported it. In the future we plan to present a DVH analysis examining the association between urethral and bladder doses with hematuria in patients where radiation was the causative factor on cystoscopy. It is also possible that the cause of hematuria could differ between the acute and late setting; however, due to the low number of patients with isolated acute hematuria (n = 5) a meaningful statistical analysis could not be performed. And lastly, the median follow up in this group of patients is relatively short, and additional hematuria events could potentially be seen with longer follow up [3].

Conclusions

SBRT for clinically localized prostate cancer was well tolerated with hematuria rates comparable to conventionally fractionated external radiotherapy and brachytherapy. Patients factors associated with BPH, such as larger prostate volume, α1A antagonist use and prior history of procedures for BPH are at increased risk for the development of hematuria. Less than 5% of men felt post-treatment hematuria was a moderate to big problem at any time point during follow-up. These results need to be confirmed with longer follow-up.

Abbreviations

ADT:

Androgen deprivation therapy

CT:

Computed tomography

CTC:

Common toxicity criteria

CTV:

Clinical target volume

DVH:

Dose-volume histogram

EQD2:

Equivalent dose in 2-Gy fractions

EPIC:

Expanded prostate index composite

GTV:

Gross target volume

Gy:

Gray

IMRT:

Intensity modulated radiation therapy

IRB:

Internal review board

PTV:

Planning target volume

QoL:

Quality of life

MR:

Magnetic resonance

NCI:

National Cancer Institute

SD:

Standard deviation

SBRT:

Stereotactic body radiation therapy

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Acknowledgements

This work was supported by the James and Theodore Pedas Family Foundation and NIH Grant P30CA051008.

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Author notes

    Authors and Affiliations

    1. Department of Radiation Oncology, University of Louisville, Louisville, USA

      Marie K Gurka

    2. Department of Radiation Medicine, Georgetown University Hospital, 3800 Reservoir Road, N.W, Washington D.C, 20007, USA

      Leonard N Chen, Aditi Bhagat, Rudy Moures, Joy S Kim, Thomas Yung, Siyuan Lei, Brian T Collins, Simeng Suy, Anatoly Dritschilo & Sean P Collins

    3. Department of Urology, Georgetown University Hospital, Washington, USA

      John H Lynch

    4. Department of Radiology, Georgetown University Hospital, Washington, USA

      Pranay Krishnan

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    Corresponding author

    Correspondence to Sean P Collins.

    Additional information

    Competing interests

    SP Collins and BT Collins serve as clinical consultants to Accuray Inc. The Department of Radiation Medicine at Georgetown University Hospital receives a grant from Accuray to support a research coordinator. The other authors declare that they have no competing interests.

    Authors’ contributions

    MG and LC are lead authors who participated in manuscript drafting, table/figure creation, and manuscript revision. AB, RM JK, and TY aided in data collection and table/figure creation. SL is the dosimetrist who contributed dosimetric data and figures. BC, PK, SS, AD, and JL are senior authors who aided in drafting the manuscript and manuscript revision. SC is the corresponding author who initially developed the concept, drafted and revised the manuscript. All authors read and approved the final manuscript.

    Marie K Gurka and Leonard N Chen contributed equally to this work.

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    Cite this article

    Gurka, M.K., Chen, L.N., Bhagat, A. et al. Hematuria following stereotactic body radiation therapy (SBRT) for clinically localized prostate cancer. Radiat Oncol 10, 44 (2015). https://doi.org/10.1186/s13014-015-0351-6

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    • DOI: https://doi.org/10.1186/s13014-015-0351-6

    Keywords

    Radiation Oncology

    ISSN: 1748-717X

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