Electrochemical tracing of hypoxia glycolysis by carbon nanotube sensors, a new hallmark for intraoperative detection of suspicious margins to breast neoplasia

Metal-(Acyclic Diaminocarbene) Complexes Demonstrate Nanomolar Antiproliferative Activity against Triple-Negative Breast Cancer

Hydrolytically stable PdII and PtII complexes supported by acyclic diaminocarbene ligands represent a novel class of structural organometallic anticancer agents exhibiting nanomolar antiproliferative activity in a panel of cancer cell lines (IC50 0.07-0.81 μM) and up to 300-fold selectivity for cancer cells over normal primary fibroblasts. The lead drug candidate was 300 times more potent than cisplatin in vitro and showed higher efficacy in reducing the growth of aggressive MDA-MB-231 xenograft tumors in mice.

High-Frequency (30 MHz-6 GHz) Breast Tissue Characterization Stabilized by Suction Force for Intraoperative Tumor Margin Assessment

A gigahertz (GHz) range antenna formed by a coaxial probe has been applied for sensing cancerous breast lesions in the scanning platform with the assistance of a suction tube. The sensor structure was a planar central layer and a metallic sheath of size of 3 cm² connected to a network analyzer (keySight FieldFox N9918A) with operational bandwidth up to 26.5 GHz. Cancer tumor cells have significantly higher water content (as a dipolar molecule) than normal breast cells, changing their polarization responses and dielectric losses to incoming GHz-based stimulation. Principal component analysis named S₁₁, related to the dispersion ratio of the input signal, is used as a parameter to identify malignant tumor cells in a mouse model (in vivo) and tumor specimens of breast cancer patients (in vitro) (both central and marginal parts). The results showed that S₁₁ values in the frequency range from 5 to 6 GHz were significantly higher in cancer-involved breast lesions. Histopathological analysis was the gold standard for achieving the S₁₁ calibration to distinguish normal from cancerous lesions. Our calibration on tumor specimens presented 82% positive predictive value (PPV), 100% negative predictive value (NPV), and 86% accuracy. Our goal is to apply this system as an in vivo non-invasive tumor margin scanner after further investigations in the future.

Accuracy of cancer diagnostic probe for intra-surgical checking of cavity side margins in neoadjuvant breast cancer cases: A human model study

BACKGROUND

Background Recently, a real-time system, named cancer diagnostic probe (CDP), has been developed to diagnose the presence of pre-neoplastic/neoplastic cells in breast cavity side margins. Detecting mechanism is real-time determination of the ROS/H₂ O₂ released from cancer or atypical cells, through reverse Warburg effect and hypoxia glycolysis pathways.

AIMS

Here, we designed a human model study based on real-time checking of 387 internal margins (IM) from 39 neoadjuvant breast cancer cases by CDP. MATERIALS & METHODS: Each lesion was checked by entered needle sensor and electrical scores were recorded. The permanent pathology result of each tested lesion was our gold standard to evaluate CDP scoring. CDP results were compared with permanent pathology of tumour side margins (as a conventional margin evaluation procedure).

RESULTS

Results showed that the sensitivity of CDP in scoring the cavity side margins of those cases is 91%. A total of 18 involved IM which had been detected by CDP were declared as free margins in pathology section of tumour side samples. Just five involved IM were missed by CDP.

DISCUSSIONS

Such sensitivity revealed that metabolism based (here: hypoxia glycolysis) tracing of cancer cells show distinct electrochemical responses between clear and involved cavity side margin evaluation.

CONCLUSION

This human study showed the promising role of CDP to achieve clear margins after BCS of neoadjuvant cases.