A pharmacokinetic evaluation of topotecan as a cervical cancer therapy

Topotecan was initially approved for the treatment of recurrent ovarian cancer. In cervical cancer, it has been investigated for its potential as part of systemic therapy for advanced and/or recurrent disease and in combination with cisplatin and radiation as a first-line treatment for advanced disease. As a topoisomerase I (topo I) inhibitor, its activity is predicted to be schedule-dependent and potentiated in a schedule-dependent manner by its interaction with DNA damaging agents.

The cytotoxicity of topotecan is believed to be due to double-stranded DNA damage produced when the DNA replication 'fork' on the opposing DNA strand is interrupted by the ternary complex formed by topotecan, topoisomerase I and DNA. This review focuses on: i) combination studies of cisplatin + topotecan both as neoadjuvant and with concomitant radiation; ii) adding this drug as a radiosensitizer in pilot studies for locally advanced disease and iii) topotecan as part of non-cisplatin combinations in metastatic disease.

Cervical cancer continues to claim many victims among parts of the world where early detection and/or vaccination programs are not systemically applied. Topotecan is an attractive building block for improving therapy against advanced disease.