The effect of examining somatic alterations with NGS in patients with solid tumors, on patient management: A single-center experience in Turkey.

OBJECTIVE: This study aimed to investigate the impact of analyzing somatic alterations using next-generation sequencing (NGS) on treatment management in patients with metastatic solid cancers and their ability to access NGS recommended treatments. METHODS: This retrospective study included eligible patients who underwent NGS on somatic tumor tissue. We examined the clinical and pathological characteristics of these patients and the alterations in their treatment following NGS results. RESULTS: A total of 101 patients who underwent NGS were included in the study. The most common cancers were non-small cell lung cancer (NSCLC), colorectal, and breast cancers, in that order. The median age was 58 (range 21-82) years, with 60 (59.4%) male participants. The median NGS turnaround time was 23 (range 17-29) days. NGS was performed on tissue from the primary lesion in 89(88%) patients. Predictive, prognostic, actionable, or variants of unknown significance were detected in 62(61.4%) patients. The most frequent variants identified were KRAS, EGFR, TP53, PIK3CA, and other rare mutations. Treatment was altered in 17(16.8%) patients based on NGS results. Of the 30 (29.7%) patients for whom NGS-informed treatment was recommended, only seven (6.9%) received the recommended therapy. There was no significant difference in overall survival (OS) between patients whose treatment was changed based on NGS results and those whose treatment remained unchanged (p = 0.897). There was no difference in OS between patients with and without variants (p = 0.384). CONCLUSIONS: NGS analysis of somatic alterations in patients with metastatic cancer may reveal additional variants beyond those identified by baseline tests. However, based on the recommendations of the reimbursement institution in Turkey, only a limited number of patients are able to access treatments recommended by NGS results. Therefore, baseline tests established in Turkey need to be made available in more centers in an appropriate time.

The effect of knowledge and person-related factors on breast cancer susceptibility genes (BRCA1/2) testing perception in Turkish women.

Genetic testing for breast cancer susceptibility genes (BRCA1/2) plays a pivotal role in risk assessment and preventive interventions. However, individuals' awareness, knowledge, and attitudes toward genetic testing can vary across different societies. This study focuses on understanding Turkish women's knowledge, perceptions, and attitudes toward BRCA1/2 testing, considering demographic factors and awareness. In this cross-sectional study, 301 Turkish participants, including breast/ovarian cancer patients and their first-degree relatives, were surveyed. Information on sociodemographics, cancer history, awareness, knowledge, and perceptions was collected. The study aimed to assess knowledge levels about breast cancer inheritance and BRCA1/2 testing, describe perspectives about testing in women with a family history of breast or ovarian cancer, and determine associations between knowledge, personal factors, anxiety, and genetic testing perspectives. Results showed a wide range in correct responses (31.6%-96.7%) for knowledge items. No significant relationship between knowledge levels and positive perception was observed. However, participants answering a specific question incorrectly showed higher negative perceptions. While most participants recognized the benefits of genetic testing, concerns centered around passing the genes to future generations. Participants who were younger, more educated, had higher income, were employed, at an earlier disease stage, and were social media users demonstrated more positive attitudes. Negative perceptions were higher among younger patients, physicians, and healthcare professionals. Interestingly, anxiety in cancer patients did not correlate with either positive or negative perceptions. In conclusion, this study identifies participant-related factors influencing perceptions of hereditary genetic tests. Understanding these factors and addressing associated issues can enhance the utilization of genetic testing and promote preventive oncology applications.

Prediction of the number of positive axillary lymph nodes according to sentinel lymph node involvement and biological subtypes in patients receiving neoadjuvant chemotherapy.

BACKGROUND: Sentinel lymph node biopsy (SLNB) has replaced axillary lymph node dissection (ALND) for assessing axillary lymph node status in clinically node-negative breast cancer patients. However, the approach to axillary surgery after neoadjuvant treatment is still controversial. In the present study, our objective was to predict the pathological nodal stage based on SLNB results and the clinicopathological characteristics of patients who initially presented with clinical N1 positivity but whose disease status was converted to clinical N0 after neoadjuvant chemotherapy (NAC). MATERIALS AND METHODS: After NAC, 150 clinically node-negative patients were included. The relationships between clinicopathologic parameters and the number of positive lymph nodes in SLNBs and ALNDs were assessed through binary/multivariate logistic regression analysis. RESULTS: Among 150 patients, 78 patients had negative SLNBs, and 72 patients had positive SLNBs. According to the ALND data of 21 patients with SLNB1+, there was no additional node involvement (80.8%), 1-2 lymph nodes were positive in 5 patients (19.2%), and no patient had ≥ 3 lymph nodes involved. Following the detection of SLNB1 + positivity, the rate of negative non-sentinel nodes were 75% in the luminal A/B subgroup, 100% in the HER-2-positive subgroup, and 100% in the triple-negative subgroup. Patients with a lower T stage (T1-3 vs. T4), fewer than 4 clinical nodes before NAC (< 4 vs. ≥4), and a decreased postoperative Ki-67 index (< 10% vs. stable/increase) were included. According to both univariate and multivariate analyses, being in the triple-negative or HER2-positive subgroup, compared to the luminal A/B subgroup (luminal A/B vs. HER2-positive/triple-negative), was found to be predictive of complete lymph node response. CONCLUSION: The number of SLNB-positive nodes, tumor-related parameters, and response to treatment may predict no additional nodes to be positive at ALND.

Lutetium-177-PSMA-617 radioligand therapy in patients with high volume metastatic prostate cancer prior to chemotherapy and new generation androgen deprivation therapy: Clinical Experience.

OBJECTIVE: We aimed to evaluate the efficacy oflutetium-177-prostate-specific membrane antigen-617 (177Lu-PSMA-617) with the luteinizing hormone releasing hormone (LHRH) analogues in the first or in the second-line setting formetastatic castration sensitive patients and metastatic castration resistance after progression with LHRH analogues. SUBJECTS AND METHODS: Sixteen consecutive patients with high volume metastatic prostate cancer undergone 177Lu-PSMA-617 therapy who were refused chemotherapy and were unable to use new generation anti-androgen drugs because of unavailibility of reimbursement, were included in this retrospective study. Prostate specific antigen (PSA) response (>50% decrease), disease control rate (DCR: complete or partial response), progression-free survival (PFS) and overall survival (OS) were calculated to evaluate according to the clinicopathological features of the patients. Treatment response evaluated by 68Ga-PSMA-11 positron emission tomography/computed tomography (PET/CT). RESULTS: Mean age was 74,6 (SD±8,36). Among them, 7 (43,8%) patients has castration resistant disease, while the remaining has castration sensitive disease. Lutetium-177-PSMA-617 was administered to 10 (62,5%) patients as one of the first-line treatment and 6 patients received the treatment after progression on LHRH as a second-line treatment. Considering all patients, PSA response rate and DCR were 50% and 62% respectively. The median PFS and OS (with 95% CI) were 11,2 months (11-15) and 29 months (25,6-32,4), respectively in patients treated with 177Lu-PSMA-617 and LHRH analogues. Clinicopathological features and basal PSA level did not have effect on PSA response rates, DCR, OS and PFS. On the other hand, increment in PFS and OS (with 95% CI) was observed in castration resistant disease and in the second-line therapy; for castration resistant disease 16,5 months (12.3-19.7); 30 months (25.3-32.7), for the second-line therapy 14.5 months (12-20.5); 29 months (NR), respectively but statistically not significant. Serious toxicity was observed in a limited number of patients (18,7%), treatment-related death was not observed. CONCLUSION: Favorable results can be achived with second-line 177Lu-PSMA-617 treatment in terms of OS and PFS, especially in castration-resistant disease, when chemotherapy and new generation ADT's cannot be used.

Should We Completely Exclude Locoregional Therapy for the Primary Tumor from Our Clinical Practice in De Novo Metastatic Breast Cancer?

Locoregional therapy (LRT) for the primary site of breast cancer (BC) is one of the most debated topics in de novo metastatic disease. We have four main randomized controlled trials, three negative and one positive, together with one positive prospectively designed non-randomized study investigating the contribution of LRT to the literature. We aimed to discuss the possible reasons for the positive or negative results of the studies and to identify specific subgroups that may benefit from primary breast surgery.

Dramatic response to crizotinib in a breast cancer patient with ALK gene rearrangement.

Rearrangements of the anaplastic lymphoma kinase (ALK) gene are present in 3-5% of non-small-cell lung cancer (NSCLC), while it was 0.2% in NSCLC tumors. Due to its low frequency, it is extremely challenging to conduct randomized clinical trials of ALK-targeted therapies in NSCLC tumors. In the present case, we describe the first reported case of triple-negative breast cancer (TNBC) harboring the ALK fusion mutation that responded to ALK-targeted therapy after progression with two lines of chemotherapy. Searching for ALK gene rearrangement or other fusion, especially in patients with chemotherapy-resistant TNBC, opens the door to new treatment strategies.

The predictive value of vitamin D follow-up and supplementation on recurrence in patients with colorectal cancer.

Aim: Vitamin D has a role in carcinogenesis and may have effect on recurrence. Thus, we aim to analyze the prognostic effect of vitamin D levels at beginning and follow-up together with the contribution of vitamin D supplementation on patients with colorectal cancer (CRC). Materials & methods: CRC patients who underwent curative surgery were included. Patients' vitamin D values were assessed under four groups according to baseline and follow-up vitamin D values, and whether vitamin D supplementation was used. Survival distributions were compared for vitamin D groups. Results: Patients with a high follow-up vitamin D level and a high vitamin D level after supplementation presented with better disease-free survival and overall survival than patients with low vitamin D and low vitamin D levels after supplementation. Conclusion: Follow-up vitamin D values seems to be a good predictive biomarker and vitamin D supplementation may have a positive effect on survival.

Association of illness perception with chemotherapy-induced nausea and vomiting: a Turkish Oncology Group (TOG) study.

Chemotherapy-induced nausea and vomiting (CINV) may be linked to the psychological status of cancer patients. Therefore, the authors aimed to better understand the underlying risk factors for CINV using the Brief Illness Perception Questionnaire. A total of 238 patients were recruited during three cycles of chemotherapy. Patient, disease and treatment characteristics were noted at the onset of chemotherapy. The Brief Illness Perception Questionnaire was administered face-to-face prior to chemotherapy. The relationship between illness perceptions and CINV was analyzed using Spearman's rank correlation. Positive illness perception parameters, including personal and treatment control, were negatively correlated, whereas negative illness perception parameters, including consequences, timeline, identity, concern and emotions, were positively correlated with CINV after adjusting for age, sex and emetogenic potential of chemotherapy (p < 0.001). Illness perception may be an underlying risk factor for CINV.

Recurrence pattern in the presence of hepatosteatosis in breast cancer: does it facilitate liver metastasis?

Aim: We aimed to investigate the impact of hepatosteatosis (HS) severity on the recurrence pattern of breast cancer and to clarify whether HS causes affinity to recurrence with liver metastasis. Materials & methods: The median follow-up was 80.0 (4-217) months and the mean age was 47.9 ± 11.3 years. Among all, 181 (39.9%) patients were diagnosed with grades 2 and 3 HS. Of total, 158 (34.8%) patients have experienced recurrence. Results: While higher degree of HS was more common in patients presented with liver recurrence (odds ratio; 95% CI: 2.50; 1.27-4.92; p = 0.007), it was lesser in those with other metastatic sites (all were >0.05). Liver-recurrence-free survival was significantly worse in the group with higher degree of HS (hazard ratio; 95% CI: 2.46; 1.4-4.3; p = 0.002) together with younger age (hazard ratio; 95% CI: 2.44; 1.4-4.3; p = 0.002) in multivariate analysis. Conclusion: HS might have produced an affinity for liver metastasis in common types of breast cancer patients in remission independent from metabolic disorders or clinicopathologic features.

Worse patient-physician relationship is associated with more fear of cancer recurrence (Deimos Study): A study of the Palliative Care Working Committee of the Turkish Oncology Group (TOG).

OBJECTIVE: Fear of cancer recurrence (FCR) is an important psychological trauma associated with reduction in the quality of life, disruptions in the level of adjustment, emotional distress and anxiety. The purpose of the study was to evaluate the impact of patient-physician relationship on FCR. METHODS: The study was designed as a multicentre survey study. The cancer survivors, who were under remission, were evaluated with structured questionnaires. Patient-physician relationship (PPR) scale in which higher scores indicate better relationship and FCR inventory was used. RESULTS: Between January and April 2019, 1,580 patients were evaluated. The median age was 57.0 (19-88), and 66% were female. There was high level of FCR scores in 51% of participants. There was a negative correlation between PPR and FCR scores (r = -.134, p < .001). In multivariate analysis, young age, female gender, history of metastasectomy and worse PPR were associated with high levels of FCR. CONCLUSION: It is the first data showing the adverse impact of worse PPR on FCR. The strategies to improve the PPR should be practised. In addition, the cancer survivors, who are under the risk of FCR, should be evaluated and managed.

Durable response after interruption of nivolumab in patients with metastatic renal cell carcinoma: Is renal toxicity a marker to predict the benefit of nivolumab?

INTRODUCTION: Nivolumab is a human IgG4 programmed death-1 immune checkpoint inhibitor antibody. Immune-related toxicity may be associated with higher response even after interruption of nivolumab. CASE REPORT: We reported a case diagnosed with metastatic clear cell renal cell carcinoma and treated with nivolumab as fourth-line therapy. Although nivolumab treatment was stopped after two cycles due to grade 3 renal toxicity, progression-free survival rates of 11 months, that is quite a long time for fourth-line treatment of renal cell carcinoma was observed. MANAGEMENT AND OUTCOME: Therefore, we speculate that when renal toxicity develops, response may continue even after interruption of nivolumab in renal cell carcinoma. DISCUSSION: Nivolumab was approved to be used for second-line treatment of renal cell carcinoma with 4.6 months of median progression-free survival benefit. Higher immune-related toxicity can produce higher efficacy for some instances such as malignant melanoma, lung cancer, and renal cell carcinoma. Renal disturbance during nivolumab treatment is extremely rare, and there are no data on survival after interruption due to renal toxicity of nivolumab without further treatment in renal cell carcinoma. In the present case, we obtained long duration of stable disease, with two cycles of nivolumab after the development of nephrotoxicity. Close follow-up without any treatment until progression may be a treatment choice, because nephrotoxicity can be a sign of benefit and durable response to nivolumab.

Illness perception is a strong parameter on anxiety and depression scores in early-stage breast cancer survivors: a single-center cross-sectional study of Turkish patients.

BACKGROUND: Illness perception has been suggested to have a significant effect on anxiety and depression in cancer patients. In this cross-sectional study, we aimed to evaluate this on Turkish breast cancer patients with follow-up periods up to 12 years. PATIENTS AND METHODS: A total of 225 patients (with 6 months to 12 years follow-up) were recruited in this cross-sectional study. The patients were divided into three groups of follow-up: 6 months-2 years, 2-5 years, and >5 years. Beck Depression Inventory, Beck Anxiety Inventory, Duke-University of North Carolina Functional Social Support Questionnaire, and Brief Illness Perception Questionnaire were used to assess the depression, anxiety, functional social support (FSS), and illness perception, respectively. Statistical significance of the associations was analyzed using Spearman correlation, Student's t, Mann-Whitney U, and ANOVA tests. RESULTS: Rates of moderate-severe anxiety and depression scores were not correlated with follow-up period and disease stage, whereas all these parameters were associated significantly with FSS and age. Parameters of illness perception were also not correlated with follow-up period and stage of disease. However, illness perception scores were noticeably better with increments in FSS. Also, the parameters of illness perception were strongly associated with the depression/anxiety score. CONCLUSION: Illness perception is an important determinant of the depression/anxiety score in Turkish breast cancer patients.

Sorafenib with TACE improves the survival of hepatocellular carcinoma patients with more than 10 cm tumor: a single-center retrospective study.

PURPOSE: Sorafenib, a multikinase inhibitor, is effective in patients with advanced hepatocellular carcinoma (HCC). Transarterial chemoembolization (TACE) is an important palliative treatment for unresectable HCC, but TACE-induced ischemic injury can upregulate angiogenic factors and it might be associated with poor prognosis. The purpose of this study was to evaluate the efficacy of conventional TACE with or without sorafenib in patients with Barcelona Clinic Liver Cancer (BCLC) stage A-B HCC. METHODS: Thirty patients with BCLC stage A or B HCC who had undergone TACE were enrolled in this retrospective study. Child-Pugh score, BCLC staging classification, size and number of lesions were recorded. Sorafenib was given 1 month after TACE to some patients who responded to TACE. Repeated TACE was performed on demand. Tumor response was assessed every 12 weeks. The primary objective of this trial was the progression free survival (PFS). Secondary objectives were overall survival (OS), disease control rate (DCR) and total number of TACE interventions. Kaplan-Meier method was used for the estimation of survival and survival curves were compared with Log-rank test. RESULTS: Twenty-five (83.3%) patients had Child-Pugh A and 5 (16.7%) Child-Pugh B, and 24 (80%) patients had BCLC stage B disease and remanining had stage A disease. Lesion size >10 cm was found in 6 patients and 16/7/7 patients had single/two/multiple lesions, respectively. Mean number of TACE was 2.10±1.369. Seventeen (56.7%) patients used sorafenib after TACE whereas 13 (43.3%) patients were followed without any treatment but received consequent TACEs if needed. PFS of all patients was 10 months (range 3-48); it was 13 months for TACE plus sorafenib group and 9 months for TACE group (p=0.081). In subgroup analysis, TACE plus sorafenib group had better PFS (36 vs 12 months) in patients with tumor size > 10 cm (p=0.025). In the analysis of Child- Pugh A cases, PFS of TACE plus sorafenib group was 23 months while it was 10 months in TACE group (p=0.007). CONCLUSION: Concurrent treatment in Child-Pugh A group HCC with conventional TACE and sorafenib demonstrates a significant efficacy in patients having tumor size >10 cm. In Child-Pugh A group, PFS was superior in the sorafenib plus TACE group than in TACE alone group.

Taxane-induced peripheral sensorial neuropathy in cancer patients is associated with duration of diabetes mellitus: a single-center retrospective study.

PURPOSE: The purpose of this study was to determine whether the presence of diabetes mellitus (DM) influences the incidence and severity of peripheral sensory neuropathy (PSN) in patients using taxane therapy. METHODS: A retrospective single-center analysis was conducted: Patients with PSN at baseline were excluded. The incidence of PSN was evaluated retrospectively in patient subgroups who received taxane arm and taxane-plus-platinum-agents combination arm with or without known DM at baseline. RESULTS: Three hundred seventy-four patients were enrolled in this study, 81 (21.6%) of patients had DM at baseline. The incidence of grade 1 PSN (non-DM/DM) in patients receiving taxane-based chemotherapy was 33.4/25.9% and more than grade 2 PSN (non-DM/DM) was 15/34.6%. The rate of neuropathy of non-diabetic patients was 48.8%, while the rate of diabetic patients was 52.8 and 75% in DM duration below 5 years and above 5 years group, respectively. CONCLUSIONS: This retrospective analysis indicates that taxane-based therapy in DM patients whose disease duration is above 5 years appears to affect the incidence and severity of PSN without known baseline neuropathy. The probability of PSN with taxane-based therapy was similar in DM duration below 5 years and non-DM patients.

Efficacy of venlafaxine for the relief of taxane and oxaliplatin-induced acute neurotoxicity: a single-center retrospective case-control study.

BACKGROUND: Oxaliplatin and taxane-induced neurosensory toxicity is dose-limiting and mostly presents with acute symptoms that affect the activities of daily living and overall quality of life. The objective of the present study is to assess the relief of acute neuropathy with venlafaxine treatment during the chemotherapy period. PATIENTS AND METHODS: In this retrospective case-control study, from January 2010 to February 2015, patients who experienced treatment with oxaliplatin and taxane-induced acute neurotoxicity were evaluated according to the NCI-CTCAE v. 4.03 grading scale. Neurotoxicity was evaluated using a numeric rating scale (NRS) for pain intensity and experienced relief under the treatment of venlafaxine and using a neuropathic pain symptom inventory scale (NPSI) for the style of complaints. Patients who were diagnosed as mildly depressed according to the HOST anxiety and depression scale and who had grade 1 to 3 sensory neurotoxicity based on the NCI-CTCAE v. 4.03 grading scale, and who also reported ≥ 4/10 on a NRS were eligible. The primary end point was the rate of more than 75 % symptomatic relief under venlafaxine treatment. RESULTS: Two hundred six patients were included (82 % female, median age: 52.7 years). Most patients had breast, gynecologic, and colon cancer (93.4 %). Ninety-one patients who received venlafaxine and 115 patients as the control group were assessed for neurotoxicity every 3 weeks. Based on the NRS, a rate of more than 75 % symptomatic relief was 53.5, 58.3, and 45.2 % in venlafaxine arm versus 0, 0, and 0 % in the control arm in the first, second, and third visits, respectively. Side-effects of venlafaxine (n = 7) were grade 1-2 nausea/vomiting (3.2 %) and asthenia/somnolence (3.2 %) without grade 3-4 events. CONCLUSION: Venlafaxine has a significant clinical activity against taxane-oxaliplatin-induced acute neurosensory toxicity.

Atypical presentation of disseminated intravascular coagulation with synchronous peripheral venous thromboembolism and arterial gangrene in a pancreatic cancer patient: a case report.

CONTEXT: Cancer is a prothrombotic state and anticancer therapies are often complicated by vascular events. The risk of developing thromboembolic events is substantially increased in patients with pancreatic cancer. One possible presentation of vascular events in pancreatic cancer is disseminated intravascular coagulation (DIC). CASE REPORT: In our case a patient with a diagnosis of pancreatic cancer initially presented with thrombosis and received low molecular weight heparin (LMWH) in addition to standard chemotherapy regimen. He was thought to have DIC by assessment of clinical and laboratory findings. CONCLUSION: Clinically, thrombosis was first located in the left femoral vein and encountered at right femoral artery after three weeks. This pattern was an unusual presentation of DIC. Subclinical DIC is common in patients presenting with pancreatic cancer and is considered a 'poor' prognostic factor. Acute DIC, on the other hand is a potentially mortal condition.

A perspective: the integration of ctDNA into Response Evaluation Criteria in Solid Tumours 1.1 for phase II immunotherapy clinical trials.

A consensus guideline, iRECIST, was developed by the Response Evaluation Criteria in Solid Tumours (RECIST) working group for the use of the modified RECIST version 1.1 in cancer immunotherapy trials. iRECIST was designed to separate pseudoprogression from real progression. However, this is not the only ambiguous situation. In clinical immunotherapy trials, stable disease may reflect three tumor responses, including real stable disease, progressive disease and responsive disease. The prediction of a "true complete/partial response" is also important. Much data has accumulated showing that ctDNA can guide decisions at this point; thus, integrating ctDNA into the RECIST 1.1 criteria may help to distinguish a true tumor response type earlier in patients treated with immunotherapy; however, prospectively designed validation studies are needed.

68Ga-FAPI PET/CT as an Alternative to 18F-FDG PET/CT in the Imaging of Invasive Lobular Breast Carcinoma.

Accurate staging of invasive lobular carcinoma (ILC), a subtype of breast cancer, is vital for effective clinical management. Although 18F-FDG PET/CT is a commonly used tool, its efficacy varies across different histologic subtypes. To mitigate this challenge, our investigation delves into the potential utility of 68Ga-fibroblast activation protein inhibitor (FAPI) PET/CT as an alternative for staging ILC, aiming to address a significant research gap using a more expansive patient cohort than the smaller samples commonly found in the existing literature. Methods: In this retrospective analysis, women diagnosed with primary ILC of the breast underwent both 18F-FDG PET/CT and 68Ga-FAPI PET/CT. Both modalities were compared across all lesion locations with the used reference standard. The interval between scans was 1 wk, without any intervening treatments. Lesions were categorized visually, and tracer activity was analyzed using SUVmax, tumor-to-background uptake ratio, and uptake ratios. Both modalities were compared across various parameters, and statistical analysis was performed using SPSS 22.0. A P value of less than 0.05 was chosen to determine statistical significance. Results: The study included 23 female ILC patients (mean age, 51 y) with hormone-positive, human epidermal growth factor receptor type 2-negative tumors. Most (65%) had the luminal A subtype. 68Ga-FAPI PET/CT outperformed 18F-FDG PET/CT, with higher tumoral activity and tumor-to-background uptake ratios (P < 0.001). Primary tumors showed significantly increased uptake with 68Ga-FAPI PET/CT (P < 0.001), detecting additional foci, including multicentric cancer. Axillary lymph node metastases were more frequent and had higher uptake values with 68Ga-FAPI PET/CT (P = 0.012). Moreover, 68Ga-FAPI PET/CT identified more lesions, including bone and liver metastases. Pathologic features did not significantly correlate with imaging modalities, but a positive correlation was observed between peritumoral lymphocyte ratio and 68Ga-FAPI PET/CT-to-18F-FDG PET/CT uptake ratios (P = 0.026). Conclusion: This study underscores 68Ga-FAPI PET/CT's superiority over 18F-FDG PET/CT for ILC. 68Ga-FAPI PET/CT excels in detecting primary breast masses, axillary lymph nodes, and distant metastases; can complement 18F-FDG PET/CT in ILC; and holds potential as an alternative imaging method in future studies.