CancerAnswers@Simmons

New Breakthroughs in Prostate Cancer Treatment

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Patient Care; Clinical Trials; Genitourinary Cancer

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Cross-disciplinary teams are working to improve the patient experience by mitigating the side effects of surgical treatment and radiation therapy.

The American Cancer Society estimates approximately 191,930 men will be diagnosed with prostate cancer in 2020. [1] Prostate cancer is the second leading cause of cancer death in men in the U.S., and approximately 1 in 41 men will die of the disease. [1] Various prostate cancer screening tests are currently available, including the prostate-specific antigen (PSA) blood test, digital rectal exam (DRE), and imaging tests, such as multiparametric magnetic resonance imaging (MPmri) and transrectal ultrasound (TRUS). [1]

Overdiagnosis and overtreatment are two key issues with prostate cancer screening today. Conventional treatment strategies, such as radiation therapy (RT) and surgery, have been associated with various adverse effects, including urinary issues and sexual dysfunction. Active surveillance (AS) is an approach that may be used in patients with low-volume, low-grade disease. The advantage of AS is the potential to avoid the toxicity of treatments. AS involves the use of close monitoring with PSA testing and examination as well as periodic prostate biopsies to evaluate for progression of disease. [1]

While the benefits of AS are evident, a common barrier to uptake is a higher likelihood of disease progression. Previous studies have demonstrated that with AS alone, progression can occur in up to 30% of patients, with some patients choosing traditional treatment methods due to anxiety around the risk of progression. [2]

“There is a risk of progression to more aggressive forms of disease in about 15-25% of patients with low-risk disease.”

Yair Lotan, M.D.

At UT Southwestern, we’re conducting research to prevent and mitigate the side effects of prostate cancer treatment, both in regard to surgical treatment and RT. We’re at the forefront of prostate cancer breakthroughs for both localized and foacl prostate cancer. We are also conducting significant research in advanced prostate cancer.

“There is a risk of progression to more aggressive forms of disease in about 15-25% of patients with low-risk disease,” says Yair Lotan, M.D., Professor of Urology and Chief of Urologic Oncology at UT Southwestern. “Currently, there are no approved therapies that have been shown to reduce the risk of progressive disease. The goal of our work is to introduce a nontoxic intervention with fewer side effects to reduce the risk for progression.”

Patients on Active Surveillance

A critical need exists to develop effective nontoxic compounds that slow prostate cancer growth. One promising agent is curcumin, which is a widely reviewed nutraceutical that has previously been considered safe to consume.

Evidence from early phase clinical trials suggests curcumin might prolong survival among prostate cancer patients. [3] The agent has shown early promising activity in preclinical prostate cancer cell lines. [4]

UT Southwestern is the sponsor of the phase three Randomized, Double-Blinded, Placebo-Controlled Trial of Curcumin to Prevent Progression of Biopsy Proven, Low-Risk Localized Prostate Cancer in Patients Undergoing Active Surveillance. [2] The primary outcome of the study is the number of patients who have progressed at 24 months of follow-up, defined using standard criteria for progression.

“The reason we were attracted to curcumin is because of the interesting data in cell lines, but animal models have also shown it has potential to slow the growth rate of prostate cancer,” says Dr. Lotan, who treats patients with bladder, prostate, kidney, ureteral, and testicular cancer. His nationally recognized research on urine and molecular markers helps to identify patients who are at higher risk for recurrent cancer.

Available Treatment Options to Reduce Toxicity

Simmons Cancer Center’s world-class team of cancer specialists has adopted cutting-edge therapies that might reduce the acute and chronic side effects associated with radiation and surgery. One product in active development, used in conjunction with RT, is the SpaceOAR hydrogel. The purpose of SpaceOAR is to temporarily position the anterior rectal wall away from the prostate during RT to reduce the radiation dose delivered to the anterior rectum. [5]

SpaceOAR was evaluated in a single-blind phase three trial of image-guided intensity-modulated RT. Prostate cancer patients (n = 222) were randomized in a 2:1 manner to the spacer or control group. The dose administered was 79.2 Gy in 1.8-Gy fractions to the prostate with or without the seminal vesicles. [5] After analysis, the results showed the three-year incidence of grade ≥ 1 (9.2% vs. 2.0%; P = .028) and grade ≥ 2 (5.7% vs. 0%; P = .012) rectal toxicity favored the spacer arm.

At three years, more men in the control arm had suffered an MID decline in bowel quality of life (QOL) (41% vs. 14%; P = .002) and urinary QOL (30% vs. 17%; P = .04) compared with the spacer arm. [5] After a median follow-up of three years, the men in the spacer arm had lower bowel toxicity and less deterioration in both urinary and bowel QOL than the control group. [5]

At Simmons, we were one of the first in the nation to embrace new technology using a gel-like substance that is injected into the space between the rectum and the prostate and eventually solidifies. During the time of radiation treatment, the gel will prevent the radiation from reaching the rectum.

About the Author

Claus Roehrborn, M.D., a world-renowned urologist and recognized expert on cancerous prostate diseases, has been practicing at UT Southwestern for more than 20 years and has served as the Chair of the Department of Urology since 2002. His practice focuses on the treatment of prostate cancer and benign prostatic hyperplasia (BPH).

Future Directions for Genetic Testing

By Brian Reys, M.S., CGC

Simmons Cancer Center offers comprehensive integrative care for all oncology patients, including the latest advances in genetic testing. One area of active research at Simmons is evaluating the utility of genetic testing to assess the hereditary risk of cancer. Several gaps in genetic testing exist today, including gender inequities, such as the ratio of women to men acquiring testing (5:1). Other gaps include African American men having a higher lifetime risk of developing prostate cancer, and lack of education among patients and referring physicians on the availability and costs of testing. Around 90% of patients who meet their insurance criteria for testing end up paying less than $100 out-of-pocket, and the cost is only $250 for patients who pay 100% out-of-pocket.

The most significant risk factors for contracting prostate cancer are age, race, and family history, and there are several key reasons to have genetic testing performed based on these risk factors. Primarily, having a first-degree relative with prostate cancer will put men in the same family at about a 30% higher risk of developing the malignancy. Additionally, outcomes for patients could be improved if they better understand their genetic risk, often allowing them to adopt lifestyle changes based on results. Lastly, genetic testing may help inform selection of specific gene therapies.

One Simmons-affiliated trial, the phase two TRITON2 study, evaluated the clinical utility of the PARP inhibitor rucaparib in patients with metastatic castration-resistant prostate cancer (mCRPC) and deleterious non-BRCA DDR gene alterations. [8] TRITON2 enrolled 78 patients who had previously advanced on one or two lines of next-generation androgen receptor-directed therapy and one taxane-based chemotherapy. [6] Among evaluable patients, radiographic and PSA responses in the ATM cohort were detected in 10.5% and 4.1% of patients assessable for each endpoint, respectively. Overall, the results suggest that mCRPC patients with abnormalities in other DDR-associated genes might benefit from PARP inhibition. [6]

I am eager to see how testing of prostate cancer genetics will allow treatment to be tailored to the patient, and over the next five years, we’re going to see a huge shift in how many people obtain genetic testing for prostate cancer

Footnotes

1. How common is prostate cancer? Cancer.org website. Updated January 8, 2020. Accessed July 28, 2020.
2. University of Texas Southwestern Medical Center. Trial of curcumin to prevent progression of low-risk prostate cancer under active surveillance. NLM identifier: NCT03769766. Accessed July 29, 2020.
3. Lojanapiwat B. Urologic cancer in Thailand. Jpn J Clin Oncol. 2015;45(11):1007-1015.
4. Mapoung S, Suzuki S, Fuji S, et al. Cyclohexanone curcumin analogs inhibit the progression of castration-resistant prostate cancer in vitro and in vivo. Cancer Sci. 2019;110(2):596-607.
5. Hamstra DA, Mariados N, Sylvester J, et al. Continued benefit to rectal separation for prostate radiation therapy: Final results of a phase III trial. Int J Radiat Oncol Biol Phys. 2017;97(5):976-985.
6. Abida W, Campbell D, Patnaik A, et al. Non-BRCA DNA damage repair gene alterations and response to the PARP inhibitor rucaparib in metastatic castration-resistant prostate cancer: Analysis from the phase II TRITON2 study. Clin Cancer Res. 2020;26(11):2487-2496.

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