Investigator

Sebathu Chiyapo

Clinical Oncologist and HOD · Princess Marina Hospital, Oncology

SCSebathu Chiyapo
Papers(4)
Impact of the COVID-1…Cervical cancer treat…Patients with Cervica…Benchmarking of the C…
Collaborators(10)
Surbhi GroverDoreen Ramogola-MasirePeter VuylstekeEmily MacDuffieLisa Bazzett-MatabeleRohini K. BhatiaErle RobertsonMemory Bvochora-NsingoBokang MaswabiDawn Balang
Institutions(6)
Cw Private HospitalUniversity Of Pennsyl…University Of BotswanaCHU BrugmannWinship Cancer Instit…Unknown Institution

Papers

Impact of the COVID-19 Pandemic on Cervical Cancer Treatment Delays in Botswana

PURPOSE Although the majority of cervical cancer cases are in sub-Saharan Africa, little is known regarding how the COVID-19 pandemic affected cancer care in this context. Drawing from robust longitudinal data, this study aimed to assess cervical cancer treatment patterns in Botswana before and during the pandemic. METHODS Longitudinal clinical and patient-reported data from a cohort of over 1,000 patients seen at a gynecologic oncology multidisciplinary team clinic in Botswana were used to evaluate treatment initiation patterns before (April 2018-December 2019) and during (April 2020-December 2021) the pandemic. The primary outcome was timeliness of treatment, defined as the number of days between the patient's first clinic visit and treatment initiation date, and categorized as timely (≤30 days), delayed (>30 days), or no treatment. The primary exposure was time of visit (pre–COVID-19 v COVID-19), defined by the month of the clinic visit. RESULTS Of the 559 patients with cervical cancer diagnosed during the study period, 336 were seen pre–COVID-19, and 223 were seen during the COVID-19 period. During the pandemic, a higher proportion of patients experienced treatment delays (66.4%) or received no treatment (24.2%), compared with the pre–COVID-19 period (35.7% and 9.8%, respectively; P < .001). Multivariable regression models indicated that patients seen during the pandemic were 10 times more likely to experience treatment delays (adjusted odds ratio [aOR], 10.01 [95% CI, 5.69 to 17.62]) and 14 times more likely to receive no treatment (aOR, 14.16 [95% CI, 7.14 to 28.10]). CONCLUSION The pandemic exacerbated treatment delays for patients with cervical cancer in Botswana. There is a need for evidence-based strategies to address these treatment delays, considering the disproportionate burden of disease and persistent disparities in access to care in Botswana and other low- and middle-income countries.

Cervical cancer treatment outcomes and survival in Botswana by human immunodeficiency virus status: Ipabalele study results

Abstract Background Cervical cancer is a leading morbidity/mortality cause, frequently co-occurring with human immunodeficiency virus (HIV) positivity, in Botswana. We examined long-term outcomes for Ipabalele study participants receiving curative chemoradiation for locally advanced cervical cancer (2015-2019) by HIV status. Methods Clinical and outcome data were collected at baseline, treatment completion, and 3 months thereafter. Patients were followed for up to 5 years. Overall survival (OS) was evaluated using Kaplan-Meier curves and Cox regression. Results The cohort comprised 295 patients (73.8% with HIV, younger at diagnosis [P < .001]) followed for a median of 44.2 months. Complete response was seen in 217/278 (76.1%) patients. Two- and 5-year OS rates were 73.4% and 59.9%, respectively, with no difference by HIV status. OS was associated negatively with advanced disease stage (III: hazard ratio [HR] 13.23, P < .001; IV: HR 7.8, P = .008) and positively with increased radiation (HR 0.977, P = .0005) and chemotherapy (HR 0.85, P = .005). Clinical response was associated negatively with advanced disease (IV: HR 0.113, P = .002) and positively with increased radiation (P = .009). Toxicity did not differ by HIV status. The most common grade-≥-2 non-hematological and hematological toxicities were radiation dermatitis (39.8%) and reduced white blood cell count (66.05%), respectively. Conclusions In this cervical cancer cohort with good HIV status control, treatment outcomes and OS were associated with disease and treatment factors, not the HIV status. Early screening and education regarding treatment protocols are crucial to improve cervical cancer outcomes in Botswana.

Patients with Cervical Cancer with and without HIV Infection Have Unique T-cell Activation Profiles despite Similar Survival Outcomes after Chemoradiation

Abstract The global burden of cervical cancer is highest in low- and middle-income countries. Women living with human immunodeficiency virus (HIV) infection are particularly affected by cervical cancer despite availability and adherence to antiretroviral therapy. Immune profile correlates of survival and treatment response have not been widely explored in patients with and without HIV infection. This study recruited women with cervical cancer undergoing definitive chemoradiation (CRT) in Botswana. Clinical characteristics and blood samples were collected. Flow cytometry was performed on samples prior to initiation, at completion, and 3 months after CRT. Logistic regression analysis identified immune markers that differed by HIV status and correlated with overall survival (OS). The study enrolled 131 consecutive women (HIV+ N = 89 and HIV− N = 42). From initiation to 3 months after CRT, a significant decrease in CD4 frequency (72%–60.55%, P < 0.001) and an increase in CD8 frequency (20.9%–31.5%, P < 0.001) were seen in women without HIV, whereas no significant changes in CD4 frequency (52.5%–50.9%) or CD8 frequency (39.9%–41.4%) were observed in those with HIV. Peripheral T cells underwent similar activation across the cohort regardless of HIV status. Improved OS was associated with reduced frequency of IL-2–expressing CD4 T-cell subsets. In women living with HIV, enhanced OS was associated with the presence of proinflammatory CD8 T cells. CRT induces peripheral T-cell activation and distinct cytokine profiles that differ by HIV status. Despite similar OS, HIV infection may differentially affect immune response to CRT in women with well-managed HIV. Significance: Chemoradiation affects the immune system of patients with cervical cancer with well-controlled HIV infection differently than those without HIV, yet their survival does not differ. This finding is an important step in understanding how management of HIV infection can modify cancer outcomes, particularly in settings with a high burden of HIV.

21Works
4Papers
32Collaborators

Positions

2014–

Clinical Oncologist and HOD

Princess Marina Hospital · Oncology

Education

2013

FCRADONC AND MMEDRADT

University of Cape Town · Radiation Oncology