Tag: breast cancer

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A New Analytical Technique for Dense Breast Tissue Mammograms

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Source: National Cancer Institute

Researchers have developed a two-pronged approach to imaging breast density in mice, resulted in better detection of changes in breast tissue, including spotting early signs of cancer. If applied in humans, the technology may also help with prognosis of disease as density can be linked to specific patterns of mammary gland growth, including signs of cancer development. The findings appeared in the American Journal of Pathology.

“Having a means to accurately assess mammary gland density in mice, just as is done clinically for women using mammograms, is an important research advance,” said Priscilla A. Furth, MD, professor of oncology and medicine at Georgetown Lombardi Comprehensive Cancer Center, and corresponding author of the study. “This method has the benefit of being applicable across all ages of mice and mammary gland shapes, unlike some methods used in earlier studies.”

While working as an undergraduate in Furth’s lab, Brendan Rooney developed an innovative analytic computer program (C’20), which allowed for sorting of mammary gland tissue to one of two imaging assessments. At first, Rooney looked at younger mouse glands and found that a program that removed background ‘noise’ in those images helped boost detection of abnormalities in what are typically rounder, more lobular tissues. But as aging occurs and the chances of developing cancer increase, lobules diminish and ridges become more apparent, just as falling autumn leaves expose tree branches. The mammary ridges represent ducts that carry milk and other fluids. When the de-noising technique was applied to the images from the older mice, it was found to be less reliable in detecting ridges. Therefore Rooney and the team turned to a different imaging program, which has primarily been used to detect blood vessel changes in the eye’s retina.

“The idea for the analytic program came from routine visual observations of tissue samples and the challenges inherent in observing differences in breast tissue with just a microscope. We found that visual human observations are important but having another read on abnormalities from optimal imaging programs added validity and rigor to our assessments,” says Rooney, the lead author of the study. “Not only does our program result in a high degree of diagnostic accuracy, it is freely available and easy to use.”

Now that the broad strokes of the research have been laid down and proof-of-principle has been established, Rooney has started medical school with a possible eye toward specializing in oncology. Both Furth and Rooney believe that future studies will need to refine and streamline their research approach in mice, including better density measurements that could enable sorting of samples into higher and lower probabilities of cancer.

Source: Georgetown University Medical Center

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Collagen’s Role in Breast Cancer Includes Triggering Metastasis

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Breast cancer cells
Breast cancer cells. Image source: National Cancer Institute on Unsplash

Type XII collagen plays a key role in regulating the organisation of the tumour matrix, according to research published in the journal Nature Communications. The study investigators also discovered that high levels of collagen XII can trigger metastasis.

Cancer cells continually interact with the tumour microenvironment one component of which is the extracellular matrix. Collagen is an important part of this tumour microenvironment, but just how it influences tumours has not been understood.

“There’s still a lot we don’t know about the role of the extracellular matrix in cancer metastasis. Our study shows that collagen XII plays an important role in breast cancer progression and metastasis,” said Associate Professor Thomas Cox, senior author of the study.

“Imagine cancer cells as seeds, and the tumour microenvironment as the soil. By studying the soil – the extracellular matrix – we can begin to understand what makes some tumours more aggressive than others, and by extension, begin to develop new ways to treat cancer,” he explained.

The research also suggests that measuring the level of collagen XII in a patient’s tumour biopsy could potentially be used as an additional screening tool to identify aggressive breast cancers with higher rates of metastasis, such as in the triple-negative type of breast cancer. Furthermore, collagen XII might be a possible target for future treatments.

The extracellular matrix is a 3D meshwork of around 300–400 core molecules, including several collagen proteins. This matrix provides structural and functional support to cells and tissues in all parts of the body.

In this study, the researchers catalogued how the tumour matrix changes over time and have generated a comprehensive database of these changes, which has been made freely available to researchers.

The team focused on collagen XII, one of 28 types of collagen in the body. Collagen XII plays an important role in organising other collagens and can have profound effects on the 3D structure of the extracellular matrix.

The researchers studied tumours in mouse models from the earliest pre-clinical stages of cancer, right through to late-stage tumours. They found that as the tumours developed, many matrix molecules changed, and importantly the level of collagen XII was also increased.

“Collagen XII seems to be altering the properties of the tumour and makes it more aggressive,” said first author Michael Papanicolaou. “It changes how collagens are organised to support cancer cells escaping from the tumour and moving to other sites like the lungs.”

The team then genetically manipulated collagen XII production, looking at the effects of metastasis to other organs. They found that as levels of collagen XII increased, so did metastasis. These findings were then confirmed in human tumour biopsies, which showed that high levels of collagen XII are associated with higher metastasis and poorer overall survival rates.

Further research will focus on studying more human samples, and investigating possible therapeutic pathways.

Source: Garvan Institute of Medical Research

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Changing Order of Breast Cancer Treatments Could Improve Outcomes

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Photo by Michelle Leman on Pexels

Changing the order of treatments given to breast cancer patients could reduce side effects resulting from mastectomy and improve outcomes, according to a clinical feasibility trial, published in The Lancet Oncology.

In the study, researchers found that switching the sequence of treatments given to breast cancer patients was safe, without any increase in complications and could lead to patients receiving faster and more effective care compared to current methods.

Thirty-three women with breast cancer requiring a mastectomy and post-mastectomy radiotherapy, were recruited to the primary radiotherapy and deep inferior epigastric perforator flap reconstruction for patients with breast cancer (PRADA) trial between January 2016 and December 2017.  They were also eligible for a breast reconstruction using tissue from another part of their body.

They were given chemotherapy followed by radiotherapy before having a mastectomy and a breast reconstruction. The team found that this approach was feasible and safe.  They also found that side effects were low and that 12 months after surgery patients reported high levels of satisfaction with their breast reconstruction.

Lead author Daniel Leff said: “We believe that, in the long term, this approach will improve patients’ mental and physical wellbeing with higher quality of life scores and satisfaction with their reconstructed breasts compared to current care. It also means that many patients who are currently denied reconstruction due to concerns of further complications due to radiotherapy may be able to get access to this treatment in future.”

Source: Imperial College London

Categories : CancerTags :

Hormone Therapy does not Increase Breast Cancer Recurrence Risk in Survivors

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Research published in the Journal of the National Cancer Institute found that menopausal hormone therapy for breast cancer survivors is not associated with breast cancer reoccurrence, despite worries among some researchers and physicians.

Hot flashes and night sweats, as well as vaginal dryness and urinary tract infections, are common in breast cancer survivors, worsening quality of life and can lead patients to discontinue therapy. These symptoms may be alleviated by vaginal oestrogen therapy or menopausal hormone therapy (MHT). However, the safety of systemic and vaginal oestrogen use among breast cancer survivors, particularly those with oestrogen receptor-positive disease, has been unclear.

Many doctors caution breast cancer survivors against using MHT following the demonstration of an increased risk of breast cancer recurrence in two trials in the 1990s. Though later studies have not shown increased recurrence, they were seriously limited, with small sample sizes and short follow-up periods.

This study compared hormonal treatment with the risk of breast cancer recurrence and mortality in a large cohort of Danish postmenopausal women treated for early-stage oestrogen receptor-positive breast cancer.

Participants were diagnosed between 1997 and 2004 with early-stage breast cancer who received no treatment or five years of hormone therapy.

Among 8461 women, 1957 and 133 used vaginal oestrogen therapy or MHT, respectively, after diagnosis. No increase was seen in the risk of recurrence or mortality for those who received either vaginal oestrogen therapy or MHT.

“This large cohort study helps to inform the nuanced discussions between clinicians and breast cancer survivors about the safety of vaginal oestrogen therapy,” said Elizabeth Cathcart-Rake, writing in an accompanying editorial. “These results suggest that breast cancer survivors on tamoxifen with severe genitourinary symptoms can take vaginal estrogen therapy without experiencing an increase in their risk for breast cancer recurrence. However, caution is still advised when considering vaginal oestrogen for breast cancer survivors on aromatase inhibitors, or when considering menopausal hormonal therapy.”

Source: EurekAlert!

Categories : CancerTags :

Study Reveals That Breast Cancer Spreads at Night

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Sleeping woman
Photo by Cottonbro on Pexels

Researchers previously assumed that metastasising tumours release cells continuously. However, a new study has reached a surprising conclusion: circulating cancer cells that later form metastases mainly arise during the sleep phase of the affected individuals. This may have implications for oncologists, as timing of samples may affect their results. The study findings have just been published in Nature.

Circadian rhythm-regulated hormones control metastasis

“When the affected person is asleep, the tumour awakens,” said study leader Professor Nicola Aceto at ETH Zurich. During their study, which included 30 female cancer patients and mouse models, the researchers found that the tumour generates more circulating cells when the organism is asleep. Cells that leave the tumour at night also divide more quickly and therefore have a higher potential to form metastases, compared to circulating cells that leave the tumour during the day.

“Our research shows that the escape of circulating cancer cells from the original tumour is controlled by hormones such as melatonin, which determine our rhythms of day and night,” said Zoi Diamantopoulou, the study’s lead author and a postdoctoral researcher at ETH Zurich.

An accidental discovery led to the study

In addition, the study indicates that the time in which tumour or blood samples are taken for diagnosis may influence the findings of oncologists. It was an accidental finding along these lines that first put the researchers on the right track, “Some of my colleagues work early in the morning or late in the evening; sometimes they’ll also analyse blood at unusual hours,” Prof Aceto said with a smile. The scientists were surprised to find that samples taken at different times of the day had very different levels of circulating cancer cells.

Another clue was the surprisingly high number of cancer cells found per unit of blood in mice compared to humans. The reason was that as nocturnal animals, mice sleep during the day, which is when scientists collect most of their samples.

“In our view, these findings may indicate the need for healthcare professionals to systematically record the time at which they perform biopsies,” Prof Aceto said. “It may help to make the data truly comparable.”

The researchers’ next step will be to figure out how these findings can be incorporated into existing cancer treatments to optimise therapies. As part of further studies with patients, Prof Aceto wants to investigate whether different types of cancer behave similarly to breast cancer and whether existing therapies can be made more successful if patients are treated at different times.

Source: ETH Zurich

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Parabens in Hair Products May Increase Breast Cancer Risk for Black Women

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Parabens, chemicals which are found in widely used hair and personal care products, cause harmful effects in breast cancer cells from Black women, according to a new study presented at ENDO 2022, the Endocrine Society’s annual meeting.

In the US, the lifetime risk of breast cancer is one in eight, and Black women are at a higher risk of getting breast cancer under the age of 40 than any other racial or ethnic group in that country. Breast cancer rates among Black South African women are also on the increase, but the cause remains unexplained and research in this area has been lacking.

“One reason for the higher risk of breast cancer may be exposure to harmful chemicals called endocrine-disrupting chemicals in hair and personal care products,” said lead researcher Lindsey S. Treviño, PhD. “These chemicals mimic the effects of hormones on the body.”

Parabens are endocrine-disrupting chemicals that are commonly used as preservatives in hair and other personal care products. Parabens cause breast cancer cells to grow, invade, spread, and express genes linked to cancer and to hormone action. Research showed that fewer paraben-free options are marketed to Black women.

“Black women are more likely to buy and use hair products with these types of chemicals, but we do not have a lot of data about how parabens may increase breast cancer risk in Black women,” Dr Treviño said. “This is because Black women have not been picked to take part in most research studies looking at this link. Also, studies to test this link have only used breast cancer cell lines from White women.”

The new study tested the effects of parabens on breast cancer cells from Black women. Parabens were found to increase the growth of a Black breast cancer cell line but not in the White breast cancer cell line. Parabens increased expression of genes linked to hormone action in breast cancer cell lines from both Black and White women. Parabens also promoted the spread of breast cancer cells, with a bigger effect seen in the Black breast cancer cell line.

“These results provide new data that parabens also cause harmful effects in breast cancer cells from Black women,” Dr Treviño said. 

The study is a part of a community-led project called the Bench to Community Initiative (BCI), which brings together scientists and community members (including breast cancer survivors) to create ways to reduce exposures to harmful chemicals in hair and personal care products in Black women with breast cancer. 

“While this project focuses on Black women, the knowledge we gain about the link between exposure to harmful chemicals in personal care products and breast cancer risk can be used to help all women at high risk of getting breast cancer,” Dr Treviño said.

Source: Endocrine Society

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For Large Breast Sizes, Prone Positioning is Less Toxic for Radiotherapy

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Woman receiving mammogram
A woman receiving a mammogram, Source: National Cancer Institute

For women with large breast sizes, receiving radiotherapy with prone positioning is less toxic than while supine, according to a study published in JAMA Oncology.

Patients treated in the supine position had significantly higher rates of moist desquamation anywhere in the breast compared with those treated in the prone position (39.6% vs 26.9%).

“Treatment in the prone position has several dosimetric advantages for these patients,” the researchers explained. “It allows for more homogeneous dose distribution owing to the smaller separation when compared with the supine position, which decreases deposition of higher doses in the inframammary fold and axilla.”

Fewer toxic effects of the skin were seen when patients were treated with hypofractionated radiotherapy compared with extended fractionation, they added.

“Prone radiotherapy appears to be an excellent option for patients with large breast size and right-sided breast cancer, and may benefit many women with left-sided breast cancer with large breast size if acceptable cardiac avoidance is feasible,” observed Mayo Clinic’s Dean Shumway, MD, and Cedars-Sinai Medical Center’s Katelyn Atkins, MD, PhD, in an accompanying editorial. “In summary, prone positioning for whole-breast radiotherapy represents a valuable addition to the armamentarium of treatment techniques to reduce the adverse effects associated with whole-breast radiotherapy.”

Of the 357 women (mean age 61 years) included, 182 were treated in the supine position and 175 were treated in the prone position.

From April 2013 until June 2016, 167 patients received 50 Gy in 25 fractions (extended fractionation) with or without boost (range 10-16 Gy). After the trial was amended in June 2016, the majority of patients (93.2%) received the hypofractionation regimen of 42.5 Gy in 16 fractions.

The researchers also found that the supine position was associated with more grade 3 desquamation compared with the prone position (15.4% vs 8.0%; OR 2.09, 95% CI 1.62-2.69, P<0.001).

In addition, when broken down by treatment with either extended fractionation or hypofractionation, extended fractionation was associated with more:

  • Toxic effects (43.3% vs 23.2%)
  • Grade 3 desquamation (17.2% vs 6.3%)
  • Pain (9.4% vs 3.4%)

“These differences were primarily driven by the rates of toxic effects in patients treated in the supine position,” the authors noted.

Specifically, in patients treated in the supine position, extended fractionation was associated with increased desquamation compared with hypofractionation (51.1% vs 27.8%), and grade 3 desquamation (23.9% vs 6.7%).

Extended fractionation was also associated with increased toxicity in patients treated in the prone position, although the link was less pronounced. Desquamation occurred in 35.2% of patients treated with extended fractionation versus 18.4% of patients treated with hypofractionation (OR 2.41), while grade 3 desquamation occurred in 10.2% versus 5.7% of patients (OR 1.87).

No differences in quality of life as measured by global health status, breast symptoms, or pain scales between the supine and prone groups were seen, the researchers noted.

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How Breast Cancer Cells Sabotage Insulin Production to Fuel Themselves

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A breast cancer cell
Scanning Electron Micrograph of a breast cancer cell. Credit: NIH

Breast cancer and diabetes have long been suspected to have some kind of relationship, but now new research in Nature Cell Biology reveals how breast cancer cells sabotage insulin production to fuel their own cravings for glucose.

Diabetes risk begins to increase two years after a breast cancer diagnosis, and by 10 years post-diagnosis, the risk is 20% higher in breast cancer survivors than in age-matched women without breast cancer.

But these epidemiological linkages are not clear-cut or definitive, and some studies have found no associations at all. In the paper, a research team describe a possible biological mechanism connecting the two diseases, in which breast cancer suppresses the production of insulin, resulting in diabetes, and the impairment of blood sugar control promotes tumour growth.

“No disease is an island because no cell lives alone,” said corresponding study author Shizhen Emily Wang, PhD, professor of pathology at UC San Diego School of Medicine. “In this study, we describe how breast cancer cells impair the function of pancreatic islets to make them produce less insulin than needed, leading to higher blood glucose levels in breast cancer patients compared to females without cancer.”

The researchers name the culprit as extracellular vesicles (EV), which carry DNA, RNA, proteins, fats and other materials between cells, a sort of cargo communication system.

The cancer cells were found to be secreting microRNA-122 into the vesicles. When vesicles reach the pancreas, Prof Wang said, they can enter the islet cells, offload their miR-122 cargo and damage the islets’ critical function in maintaining a normal blood glucose level.

“Cancer cells have a sweet tooth,” Prof Wang said. “They use more glucose than healthy cells in order to fuel tumor growth, and this has been the basis for PET scans in cancer detection. By increasing blood glucose that can be easily used by cancer cells, breast tumors make their own favorite food and, meanwhile, deprive this essential nutrient from normal cells.”

Feeding mice slow-releasing insulin pellets or an SGLT2 inhibitor restored normal control of glucose in the presence of a breast tumour, in turn suppressed the tumour’s growth.

“These findings support a greater need for diabetes screening and prevention among breast cancer patients and survivors,” remarked Prof Wang, noting that a miR-122 inhibitor is currently in clinical trial as a potential treatment for chronic hepatitis C. It has been found to be effective in restoring normal insulin production and suppressing tumour growth in mouse models of breast cancer.

“These miR-122 inhibitors, which happen to be the first miRNA-based drugs to enter clinical trials, might have a new use in breast cancer therapy,” Prof Wang posited.

Source: University of California – San Diego

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Why Breast Cancer Metastases Spread to the Bones

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A breast cancer cell
Scanning Electron Micrograph of a breast cancer cell. Credit: NIH

A team of biologists has discovered a factor that increases cellular plasticity can explain why, in breast cancer, metastases spread to the bones. Their findings appear in the journal Nature Communications.

The organs affected by cancer metastases depend in part on their tissue of origin – in the case of breast cancer, they usually form in the bones. No cure for metastatic breast cancer exists yet, and it is associated with a poor prognosis with a 5-year survival rate of 26%. However, treatments can improve and extend the lives of patients.

From the primary site of a tumour, cancer cells can invade their microenvironment and then circulate via blood and lymphatic vessels to distant healthy tissue to form metastases. In the case of metastatic breast cancer, the cancer cells primarily colonise the bones, but can also be found in other organs such as the liver, lungs or brain.

Plasticity of tumour cells

Although the mechanisms behind the different stages of the metastatic process are not yet fully understood, cellular plasticity plays an important role: tumour cells that become metastatic change their shape and become mobile.

Using mice, the researchers investigated the potential role of the protein ZEB1, known to increase cell plasticity, in breast cancer cell migration.

“Unlike in women, mice transplanted with human breast cancer cells develop metastasis to the lungs, not the bones. We therefore sought to identify factors capable of inducing metastasis in bone tissue and in particular tested the effect of the factor ZEB1.,” explained researcher Nastaran Mohammadi Ghahhari, first author of the study

Directing metastasis to bone

In in vitro migration and invasion experiments, the scientists found that cancer cells expressing ZEB1 moved to bone tissue, unlike cancer cells that did not express it. These results were later confirmed when human breast cancer cells were transplanted into the mammary glands of mice. If the cancer cells did not express ZEB1, metastasis occurred primarily in the lungs. In contrast, when ZEB1 was present, metastases also developed in the bones, as is the case in women.

‘‘We can therefore assume that this factor is expressed during tumour formation and that it directs cells that have acquired metastatic characteristics to the bones,’’ explained Didier Picard, the study’s last author. These findings confirm the importance of plasticity in metastases, and could help lead to new therapies.

Source: University of Geneva

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Key Factors in Hospitalisation after Breast Reconstruction Surgery

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Photo by Jafar Ahmed on Unsplash

Factors such as anaemia and anticoagulants have more impact on hospitalisation time after breast reconstruction than “common” risk factors according to a new study published in the Journal of Clinical Medicine.

The study investigated the impact of different factors on postoperative blood loss and drainage fluid volume, two factors which can lengthen hospitalisation time of patients after breast reconstruction after breast cancer surgery. The findings of the study allow for an improved risk assessment and planning of reconstructive breast surgery to offer patients personalised and improved treatment.

Partial or total mastectomy is often necessary in breast cancer surgery, and reconstructive breast surgery lessens the psychological stress on the patient. Fast wound healing after surgical breast reconstruction is crucial to not delay subsequent cancer treatments. Factors influencing the length of hospital stay (LOS) or wound healing are therefore particularly significant in cancer treatment. This study identified previously unrecognised risk factors.

Blood loss and drainage fluid volumes after breast reconstruction due to breast cancer were recorded, parameters which are closely linked to the healing process and LOS .Lower loss equals earlier patient discharge and early start of subsequent treatment. “We analysed factors that might affect blood loss and drainage fluid volumes after surgery – but can be identified before the surgery,” explained lead author Dr Tonatiuh Flores, plastic surgeon. “These factors included age, body mass index and smoking status – factors that are known to have a strong impact on the course of disease.” Additionally, haemoglobin levels and possible antithrombotic prophylaxis were reviewed – two parameters that are particularly significant in oncological treatment.

Surprising results emerged from the evaluation of a total of 257 breast reconstructions in 195 patients. Professor Konstantin Bergmeister, senior author of the study explained that “the classic risk factors did not significantly influence postoperative blood loss and drainage fluid output. Haemoglobin levels and anticoagulant concentration, however, did.” The analysis revealed a close relation between low haemoglobin values or anaemia and fluid loss after reconstructive breast surgery. Co-author Prof. Klaus Schroegendorfer, elaborated on this: “Especially breast cancer patients often show perioperative anaemia, caused by the frequently required neoadjuvant chemotherapy which can affect blood values, in particular haemoglobin.”

There were similar findings regarding low molecular heparin used in cancer patients as antithrombotic prophylaxis. Patients receiving heparin tended to have increased drainage fluid output after surgery, though the effect was not as strong as with perioperative anaemia.

The study authors recommend that, to cut LOS and continue the necessary cancer treatment after reconstructive breast surgery in cancer patients as early as possible, patients should preoperatively be screened for anaemia and administration of low molecular heparin should be adapted to the patients’ risk. In correlation to the results, follow-up treatment can be improved, patients can be discharged earlier and cancer treatment can be continued.

Source: Karl Landsteiner University of Health Sciences