Treatment of alpelisib induced hyperglycemia with sodium-glucose cotransporter-2 inhibitors: A single institution experience

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Background: PIK3CA mutations occur in about 40% of patients with HR+/HER2- breast cancer. The phase III SOLAR-1 trial demonstrated prolonged progression-free survival with alpelisib and fulvestrant compared to fulvestrant alone among patients with HR+/HER2-/ PIK3CA mutant advanced breast cancer previously treated with endocrine therapy. Hyperglycemia was seen in 64% of patients treated with alpelisib and fulvestrant and was treated with metformin. Inhibition of PI3Kα leads to an on-target effect of hyperglycemia and a secondary hyperinsulinemia. This rebound hyperinsulinemia may lead to escape PI3K pathway activation in breast cancer progression via the insulin and IGF1pathways. Concurrent administration of SGLT2 inhibitors may abrogate the PI3K pathway activation effect and delay disease progression. This study reports time on treatment with alpelisib and PFS among patients who received an SGLT2 inhibitor with alpelisib. Methods: A retrospective review of all metastatic breast cancer patients treated with alpelisib was completed from 8/2019 to 5/2021 at the Saint Luke’s Koontz Center for Advanced Breast Cancer. Results: This review included 22 female patients, 11 received an SGLT2 inhibitor for treatment related hyperglycemia (A+SGLT group) and 11 who received metformin/other diabetic agents (A group). Baseline characteristics were not significantly different between the two groups: median age 63, BMI of 29.1, hemoglobin A1C of 6.3 and fasting blood glucose of 119.1mg/dl. PIK3CA mutations included H1047X (40.9%), E545X (31.8%), E542K (13.6%), other (13.6%). The median number of prior treatments for MBC was 3 (range 1-5). Prior treatments included aromatase inhibitors: 100%, fulvestrant: 77%, CDK 4/6 inhibitors: 82%, everolimus: 32% and chemotherapy: 68%. Hyperglycemia grade 2+ was seen in 72.7% of patients. There were no significant differences between the two groups for emergency room visits, hospitalizations, or endocrinology referrals related to hyperglycemia. Median time to initiation of an SGLT2 inhibitor was 13 days following the first dose of alpelisib. PFS was longer in the A+SGLT compared with the A group with a median time to progression of 6.1 months and 3.9 months respectively (HR 0.51; 95% CI 0.16 to 1.63; p = 0.39). Time on treatment was significantly longer for A+SGLT group compared with the A group, with a median time on treatment of 5.8 months, compared with 3.0 months (HR 0.32; 95% CI 0.11 to 0.92; p = 0.03). The primary reason for discontinuation of alpelisb was disease progression in 73%, with no statistically significant difference in the reason for discontinuation between the groups. Conclusions: This study supports a potential clinical benefit of an SGLT inhibitor along with alpelisib in allowing for a longer time on treatment, without significant adverse events. It also suggests a possible favorable impact on PFS for the combination.

A pilot study of individualized exercise prescription to improve physical activity in cancer survivors

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Background: Physical activity (PA) in cancer survivors improves quality of life (QOL), functioning, fatigue, and reduces the risk of treatment complications, cancer recurrence and death. However, the optimal intervention for increasing PA is not established. Most prospective studies have shown a 6-12-week program to be an effective intervention but this is often not feasible. Therefore, we piloted a one-time individualized exercise prescription in our cardiac rehabilitation center to improve PA in cancer survivors. Methods: We prospectively enrolled cancer survivors who had completed curative intent treatment, with no evidence of active disease in this pilot study. Survivors who consented underwent a consultation with an exercise physiologist for needs assessment followed by a supervised exercise session with a tailored exercise prescription. Survivors also filled out surveys assessing their PA and QOL at baseline (bl), 3, 6 and 12 months after intervention. Clinical information was collected via chart review. We estimated longitudinal PA score and change in PA using mixed models incorporating scores from all available time points using SAS (v 9.4). Results: Between May 2018 and January 2020, 50 participants (26 lymphoma and 24 solid tumor survivors) completed the intervention. 20% participants were on maintenance therapy during the study. Clinical characteristics of 42 evaluable participants are summarized in Table. The survey response rate was 82%, 58%, 58%, 46% at bl, 3, 6 and 12 months respectively. The level of PA improved with time [mean (SE) PA score: 58.5 (4.3) bl, 63.9 (4.8) at 3, 57.6 (4.8) at 6, 62.6 (5.3) at 12 months]. The change in PA from baseline to follow-up time-points [bl vs 3m p=0.41; bl vs 6m p=0.88; bl vs 12m p=0.55] or between the lymphoma and solid tumor survivors was not statistically significant and limited by sample size. No significant trend in QOL was seen. Conclusions: Individualized exercise prescription using the cardiac rehabilitation program may be a feasible, widely applicable tool to implement a PA intervention among cancer survivors. The trend towards improvement in PA in this novel one-time intervention provides intriguing evidence and deserves future study in larger sample sizes to understand if it can improve and create sustainable PA change comparable to longer term exercise interventions.[Table: see text]

Nasal vestibulitis: An MNCCTN natural history trial—Nasal vestibulitis symptoms associated with paclitaxel, docetaxel, and other chemotherapy agents

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Background: Nasal vestibulitis has been infrequently described as a side effect of cancer-directed therapy; however, a preliminary study reported that 71% of patients undergoing taxane chemotherapy experienced nasal vestibulitis symptoms. This natural history trial describes the incidence, characteristics, and severity of nasal vestibulitis symptoms among patients undergoing paclitaxel, docetaxel, and non-taxane chemotherapy. Methods: Eligible participants who reported baseline (prior to starting chemotherapy) nasal symptoms ≤ 2 on a 10-point scale were enrolled in this trial upon initiation of a new treatment regimen, involving paclitaxel or docetaxel, or non-taxane chemotherapy. Participants completed nasal symptom logs each time they received a dose of therapy until either the regimen was stopped or four months had passed. The proportion of patients reporting new nasal symptoms was estimated within each cohort with the 95% exact confidence interval (CI). A cumulative incidence model was utilized to quantify the incidence of treatment-emergent nasal symptoms within each cohort, while controlling for age, sex, smoking history, and history of asthma or allergies. Results: Thirty-five participants received paclitaxel, 21 received docetaxel, and 25 received other types of chemotherapy. 86.4% of participants were female, mean age was 60.2 ± 11.2 years; 93.8% of participants completed 2 or more surveys. A higher percentage of participants in the paclitaxel cohort experienced new nasal vestibulitis symptoms than participants in the other two cohorts. The percentage (95% CI) of participants with nasal symptoms, for patients receiving paclitaxel, docetaxel, and non-taxane chemotherapy were 74.3% (56.7%, 87.5%), 47.6% (25.7%, 70.2%), and 44.0% (24.4%, 65.1%), respectively. Epistaxis was reported by 60% of participants in the paclitaxel cohort. Paclitaxel-receiving participants also reported nasal dryness (48.6%), scabbing (40.0%), and pain (20.0%). Nearly half of participants reported moderate symptoms (4-7 out of a 10-point scale), with 8.6% reporting symptoms as severe (8-10 on a 10-point scale). Conclusions: Nasal vestibulitis is a common side effect of chemotherapy, especially paclitaxel chemotherapy.

Living systematic reviews: A novel mechanism for improving efficiency and quality of evidence synthesis in oncology

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Background: In a rapidly moving field, such as cancer immunotherapy, where immune checkpoint inhibitors (ICIs) are used across 14 different tumor types, patients may receive suboptimal treatment or even be harmed if information on toxicity is not readily translated for use in clinical practice. Every single systematic review and meta-analysis which attempted to summarize toxicity of immune checkpoint inhibitors (ICIs) quickly became outdated. A living systematic review, which is defined as a systematic review that is continually updated to incorporate relevant new evidence as it becomes available, is necessary in this situation. Methods: The process of creating a living systematic review started with the creation of a comprehensive search designed by a librarian experienced in systematic reviews in collaboration with the study’s principle investigator. Search was constantly updated every 3 months and evidence is synthesized in a series of steps (microtasks) using a combination of human and augmented intelligence. A complete infrastructure is being developed and it includes automated cumulative meta-analysis and an online reporting platform which will constantly update information for clinicians and patients in a live manner. Results: We screened 6746 studies during Sep 2018-March 2019 and identified 6746 studies and we were able to successfully maintain up-to-date toxicity estimates for immune mediated adverse events over this period while maintaining the rigor of a conventional systematic review. Eventually, we will integrate the steps of LSR into one, user-friendly, semi-automated format which can independently provide accurate estimates and feed into and support a living guidelines platform through shared Application Programing Interface (APIs). Conclusions: LSRs are feasible, efficient, and when fully developed can reduce redundancy and waste in medical research, improve the quality of evidence, reduce human effort and support living and dynamic guidelines to facilitate truly informed shared decision making.

Acupuncture: Real-world patient-reported outcomes of treatment-related symptoms in breast cancer survivors

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Background: Acupuncture has been shown to reduce aromatase inhibitor-induced arthralgias, as well as possibly hot flashes and fatigue, but research has been limited. The purpose of this study was to evaluate real world perceived benefit of acupuncture for commonly experienced symptoms among breast cancer survivors. Methods: Breast cancer survivors who had used acupuncture for cancer- or treatment-related symptoms were identified using an ongoing prospective Mayo Clinic Breast Disease Registry (MCBDR) cohort. In addition, Mayo Clinic electronic health records (EHR) were queried to identify additional participants. All identified patients were mailed a survey with acupuncture-related questions. Respondents were also asked to recall their severity of arthralgia, myalgia, post-surgical pain, hot flashes, nausea/vomiting, fatigue, depression, anxiety, insomnia, lymphedema, headache, and neuropathy from 1 to 5 (1 = mild, 5 = severe) before and after acupuncture treatment. Results: Acupuncture use was reported among 413 participants in MCBDR (12% of all enrollees) and 73 patients were identified in the Mayo EHR. 241 eligible women returned surveys (median age at diagnosis 50 yrs). Mean symptom severity scores decreased from before to after acupuncture by at least 1 point for all queried symptoms (Table). Conclusions: Acupuncture is frequently used by patients for a variety of breast cancer-related symptoms. Those who do pursue acupuncture usually perceive few toxicities and substantial benefits. Cost may be a barrier to treatment for some. [Table: see text]

A living systematic review of immune checkpoint inhibitors in cancer patients: A novel platform for evidence synthesis in oncology

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Background: Several previous systematic reviews and meta-analyses have attempted to summarize toxicity of Immune checkpoint inhibitors (ICIs). However, very soon after each one of these reviews has been published, it became outdated. ICIs are currently used in 14 different cancers and data is rapidly evolving from new clinical trials. A living Systematic review, which is defined as a systematic review that is continually updated to incorporate relevant new evidence as it becomes available, is necessary in this situations. Therefore, we performed an updated systematic review and a meta-analysis which will serve as a foundation of a living Systematic review. Methods: MEDLINE, EMBASE and Cochrane were searched to identify phase 2 and 3 RCTs of PD-1/PD-L1 ICIs. Included studies compared either immunotherapy alone or combination with existing standard of care treatment and reported data for AE’s of interest. DerSimonian-Laird random effects Meta-Analysis was performed to derive pooled odds Ratio (OR) estimates for AE’s of interest. An infrastructure of a living systematic review is being developed and it includes monthly literature searches, cumulative meta-analysis and an online reporting platform. Results: We screened 6746 studies and 31 phase 3 and 2 phase 2 RCTs (n = 21,421) were included in the analysis. 22 RCTs used PD-1/PD-L1 ICIs as a single agent and 11 as a combination therapy. Selected toxicity estimates are summarized in a table. Conclusions: The meta-analysis updates previously published toxicity estimates and provides additional information about the risk of toxicities in single versus combination regimens. We have initiated the first living systematic review in oncology that will be continuously updated, incorporating relevant new evidence as it becomes available, and will provide accurate and up to date toxicity estimates to support clinical decision making. [Table: see text]

Abstract P1-12-10: Regimen-specific rates of chemotherapy-related amenorrhea in breast cancer survivors

Background: Chemotherapy can damage the ovaries and cause amenorrhea, a surrogate for infertility. Young women often wish to understand and minimize their risk of chemotherapy-related amenorrhea (CRA). However, the incidence of CRA with regimens that do not include either an anthracycline or cyclophosphamide is poorly studied. For patients with HER-2 positive disease, these anthracycline and cyclophosphamide-sparing regimens (e.g., docetaxel-carboplatin) are common (in combination with Her-2 directed therapy) in both the neoadjuvant and adjuvant settings.

Methods: Women diagnosed with breast cancer under age 50 and within the past 10 years were recruited through a Dr. Susan Love Research Foundation Army of Women e-mail blast. Those who provided their contact information were mailed a consent form and medical record authorization form. Participants then received a web-based survey that inquired about receipt of and type of chemotherapy (including date of last dose) and date of last menstrual period (LMP). Patient-reported LMP was compared to date of final chemotherapy dose to determine if the LMP occurred before (defined as “CRA”) or after the last chemotherapy dose. When available, medical record data was used in place of survey data regarding type of chemotherapy used. Exclusion criteria included: LMP prior to diagnosis date, receipt of multiple chemotherapy regimens or no chemotherapy regimens, receipt of ovarian suppression medications (which interfere with interpretation of menstrual data), surgical menopause prior to or at the same time as diagnosis, a cancer diagnosis more than 10 years prior, incomplete menstrual data on the survey, report of an unknown chemotherapy regimen, and no date available for the last chemotherapy dose without an LMP within a month prior to survey completion. Fisher Exact test was used to compare CRA rates between regimens. Rates after two anthracycline-sparing regimens (taxane/cyclophosphamide; taxane/carboplatin) were compared to rates after anthracycline/cyclophosphamide/taxane.

Results: 273 women consented to participate in this study, 258 of whom filled out the web survey. 151 of them were eligible for this analysis with a median age at diagnosis of 41 (range 24-49) and a median time from last chemotherapy dose to survey of 62.5 months (range 2-138). CRA occurred in 51.2% of the 86 participants who received an anthracycline, cyclophosphamide, and a taxane, in 41.9% of the 43 participants who received only a taxane and cyclophosphamide (p=0.35), and in 13.3% of the 15 participants who received carboplatin with a taxane (p=0.01). When the 11 patients who were <12 months since last chemotherapy were excluded, CRA rates changed minimally. Age did not differ by regimen, but median time since chemotherapy was shorter in the taxane/carboplatin group (35 months vs. 68 months). Trastuzumab with or without pertuzumab was administered in 100% of patients who received carboplatin/taxane, in 23.3% of patients who received taxane and cyclophosphamide, and in 22.1% of patients who received anthracycline/cyclophosphamide/taxane.

Conclusions: This study suggests that carboplatin/taxane may be substantially less gonadotoxic than cyclophosphamide-based (neo)adjuvant regimens. Further research is necessary to confirm these findings.

Citation Format: Gast KC, Cathcart-Rake EJ, Norman A, Eshragi L, Obidegwu N, Yost K, Nichols HB, Rosenberg S, Su HI, Stewart E, Couch F, Vachon C, Ruddy KJ. Regimen-specific rates of chemotherapy-related amenorrhea in breast cancer survivors [abstract]. In: Proceedings of the 2018 San Antonio Breast Cancer Symposium; 2018 Dec 4-8; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2019;79(4 Suppl):Abstract nr P1-12-10.

Immunotherapy-related toxicities: More common than originally reported?

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Background: Population level data regarding incidence of immune-related adverse events (irAE) is lacking. This study evaluated the frequency of irAEs among a large population of patients with non-small cell lung cancer (NSCLC) who received immune checkpoint inhibitors. Methods: Administrative claims data from a large U.S. commercial insurance database (OptumLabs Data Warehouse) were used to retrospectively identify patients with NSCLC who received PD-1 or PD-L1 inhibitors between January 1, 2015 to December 31, 2017. The frequencies of irAEs were reported, identified by having a new medical claim with a corresponding ICD-9 or ICD-10 code during the time period in which the patient was on immunotherapy. Results: Of 2,798 patients with NSCLC (median age at PD-(L)1 initiation: 69 years, interquartile range: 60-75, 1558 male [55.7%], 1240 [44.3%] female), 1,998 (71.4%) received nivolumab, 699 (25.0%) received pembrolizumab, and 101 (3.6%) received atezolizumab. Most patients (1463, 52.3%) received a PD-(L)1 inhibitor as second line therapy; the majority of patients (744) received alkylating agents and antimetabolites prior to receiving PD-(L)1 therapy. See Table 1 for frequencies of irAEs. Conclusions: The current study suggests that the frequencies of some irAEs related to immune checkpoint inhibitor therapies may be higher than those which were reported in the initial trials that led to the FDA approvals for immunotherapies. For example, hypophysitis was noted to occur in 0.6% of patients in the KEYNOTE-024 trial, but was identified in 2.4% of patients in this large cohort. Real world data may refine provider and patient expectations for outcomes beyond what is observed in clinical trials. [Table: see text]

Nasal vestibulitis as an under-recognized and undertreated side effect of cancer treatment

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Background: Dryness, crusting, and bleeding of the nares due to inflammation, termed nasal vestibulitis (NV), is infrequently reported as a side effect of cancer treatments. However, one study described 115 patients who developed NV while undergoing targeted therapies; many were treated with bacitracin ointment (Ruiz et al Sup Care Cancer 2015). Methods: This study surveyed 94 patients regarding the presence of nasal symptoms during cancer treatments. Participants were consented for the study if they had undergone at least 6 weeks of cancer-directed therapy in the Mayo Clinic Chemotherapy Unit. They were asked about types of nasal symptoms, severity, and symptom treatments. A chart review was then conducted to determine documentation of symptoms, the presence of concurrent illnesses, and cancer treatment regimens. Results: Ninety-four patients completed questionnaires, with 41% reporting unpleasant nasal symptoms that they attributed to cancer treatments. Of the symptomatic patients, 46% had dryness, 33% had discomfort, 54% had bleeding, and 46% had scabbing. Average severity was 1.9 on a scale from 1 to 3 (1 = mild, 3 = severe). Symptoms were noted in patients undergoing a variety of cancer treatment regimens, with the highest frequency in patients undergoing a taxane-containing regimen (46%). 62% of patients with symptoms said they reported them to their provider, but only 41% of chart notes (for 16 patients) contained documentation of such, most frequently described as “allergies” or “epistaxis.” Only 10% of symptomatic patients had nasal swabs; all of which were obtained during respiratory illness or pre-op. 49% of patients with nasal symptoms reported treating their symptoms. Antihistamines (7 patients), nasal saline (6 patients), or nasal lubricants (i.e. Vaseline; 7 patients) were used; 2 patients applied bacitracin. 18% of symptomatic patients had providers who recommended treatments, including 2 patients who were thought to have concurrent infection and were treated with antibiotics. Conclusions: NV symptoms are prevalent among oncology patients, but infrequently recorded or treated by providers.

Amenorrhea in lung cancer patients

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Background: More than 5,000 premenopausal women are diagnosed (dx’d) with lung cancer annually in the United States. Improvements in treatment are contributing to a growing population of young survivors. Limited data exist regarding the risk of treatment-related amenorrhea, a surrogate for infertility and early menopause, after systemic therapies for lung cancer. Methods: Since 1997, we mailed annual surveys to patients seen at Mayo Clinic for lung cancer who consented to join a research cohort. Surveys queried menopausal status and age of menopause. Those who were dx’d under age 50, who were treated with curative intent, and who reported that they were premenopausal at the time of the cancer dx were included in this analysis. “Immediate” treatment-related menopause was defined as reporting age of menopause as the same as the age at diagnosis or 1 year (yr) older. Results: Of 182 survey respondents to date (mean time from dx to 1st survey: 26 mos, SD 24 mos, range 12-202 mos), 85 (mean age 44 yrs, SD 5, range 34-48) received chemo during the yr after diagnosis, 26 of whom also received targeted therapy during that yr. Lung cancer dx occurred 1958-2016. Platinum drugs, taxanes, and etoposide were the most common chemotherapies. 46% of chemo recipients (mean age 47, SD 2, range 41-49) experienced immediate menopause, 9% (mean age 43 yrs, SD 5, range 35-48) experienced menopause at least 2 yrs after the age of dx, and 45% (mean age 40 yrs, SD 5, range 25-48) remained pre- or peri-menopausal at their final survey (on average 3 years after dx, SD 2, range 1-10). Only 3 patients received targeted therapy alone, and the remaining 94 (mean age 42 yrs, SD 6 years) received no systemic therapy within a year of diagnosis. 15% of these 94 (mean age 45 yrs, SD 3, range 41-49) experienced immediate menopause, 16% (mean age 43 yrs, SD 4, range 36-49) experienced menopause 2+ yrs after the age of diagnosis, and 69% (mean age 41 yrs, SD 7, range 20-49) remained pre- or perimenopausal at their final survey (on average 4 yrs after dx, SD 3, range 1-10). Conclusions: Chemotherapy for lung cancer causes amenorrhea in a substantial proportion of women dx’d with lung cancer while premenopausal. Further research on fertility and menopausal symptoms after lung cancer treatment, and on differences between regimens, is warranted.