SQ-109 is a [1,2]-diamine-based ethambutol (EMB) analog developed for the treatment of tuberculosis. SQ109 acts by inhibiting MmpL3, a transporter of trehalose monomyclate, which is an important component of cellular wall. The drug was investigated as a monotherapy or in combination with rifampicin in phase II clinical trials in pulmonary tuberculosis patients. The clinical trials, however, did not demonstrate activity of SQ-109 alone or its ability to enhance the activity of rifampicin.

Cizolirtine is a potent analgesic in mice and rats, with an efficacy superior to that of aspirin and other nonsteroid anti-inflammatory drugs. Recent studies have shown that the analgesic effect of cizolirtine could be related, at least partially, to an inhibition of spinal substance P and calcitonin gene-related peptide release. Cizolirtine has been in clinical trials for the treatment of pain and overactive bladder. Reported adverse events are: dry mouth, dizziness, nausea, vomiting, blurred vision.

Irosustat is a first-generation, orally active, irreversible steroid sulfatase inhibitor. It did not stimulate the growth of estrogen-sensitive MCF-7 breast cells in vitro. Irosustat was in phase II clinical trials for the treatment of breast cancer and endometrial cancer and phase I clinical trial for the treatment of prostate cancer. However, this research has been discontinued.

Alisertib (MLN8237) is an orally available selective aurora A kinase inhibitor developed by Takeda. Alisertib inhibited AAK over ABK with a selectivity of more than 200-fold in cells and produced a dose-dependent decrease in bipolar and aligned chromosomes in the HCT-116 xenograft model, a phenotype consistent with AAK inhibition. Alisertib inhibited proliferation of human tumor cell lines in vitro and produced tumor growth inhibition in solid tumor xenograft models and regressions in in vivo lymphoma models. It is currently in phase II clinical trials for acute myeloid leukaemia; B cell lymphoma; brain cancer; mesothelioma; prostate cancer; small cell lung cancer.

Finrozole is a nonsteroidal competitive aromatase inhibitor that is being evaluated in Phase II trials for the treatment of lower urinary tract symptoms associated with reduced androgen/estrogen ratio in aging males associated with benign prostatic hyperplasia. But this research was discontinued in 2005. In dimethylbenzanthracene-induced rat mammary carcinoma model, Finrozole causes regression of more than 80% of the established tumors. The hormone-dependent mammary tumors are inhibited to a level seen in ovariectomised animals.

Afuresertib (GSK2110183 ) is an orally bioavailable inhibitor of the serine/threonine protein kinase Akt (protein kinase B) with potential antineoplastic activity. Afuresertib binds to and inhibits the activity of Akt, which may result in inhibition of the PI3K/Akt signaling pathway and tumor cell proliferation and the induction of tumor cell apoptosis. Activation of the PI3K/Akt signaling pathway is frequently associated with tumorigenesis and dysregulated PI3K/Akt signaling may contribute to tumor resistance to a variety of antineoplastic agents. Preclinically, AKT inhibition by afuresertib can reverse platinum resistance in ovarian cancer cell lines isolated from patients with platinum-resistant ovarian cancer. Afuresertib is well tolerated and demonstrates clinical activity as monotherapy in heavily pretreated MM patients. Is in phase II clinical trials for Chronic lymphocytic leukaemia; Haematological malignancies; Histiocytosis.

Temperocol is an investigative anti-cancer drug that inhibits the expression of survivin and CDK-1; discovered at Johns Hopkins University and under development by Erimos Pharmaceuticals. It has been tested in phase I/II clinical trials for Leukemia, and several forms of neoplasms including gliomas. Results of these clinical trials have shown promise, however treatment regimes produce several toxic side effects that need to be balanced against efficacy. Temperocol is a fully methylated derivative of the natural product Nordihydroguaiaretic acid.

Artemisone (also known as BAY-44-9585; BAY-449585) is a 10-amino-artemisinin derivative that is markedly superior in vitro and in vivo to current artemisinins against malaria and also possesses antitumor activity. Nonetheless, its low water solubility and bioavailability has limited its clinical use, that is why was studied the encapsulated artemisone against human melanoma A-375. In addition, artemisone has the potential to be efficacious for the treatment of H. pylori infection, especially in combination with antibiotics.

Tideglusib (NP031112, NP-12, Nypta, Noscira SA, Madrid, Spain), a drug, which belongs to the thiadiazolidinone family, is a GSK-3β inhibitor. Tideglusib was in phase II clinical trials for the treatment of Alzheimer disease (AD) and progressive supranuclear palsy. Participants showed no benefit on either of the primary outcome measures or exploratory endpoints and further development in the drug was halted for these two disease. However, Tideglusib is on phase II clinical trial to determine whether drug is safe and efficacious in the treatment of adolescents and adults with congenital and juvenile-onset Myotonic Dystrophy.

Pracinostat is a pan-histone deacetylase inhibitor being tested in phase II of clinical trials for the treatment of sarcoma, prostate cancer, acute myeloid leukemia, myelofibrosis, myelodysplastic syndrome. The drug was shown to be active in vitro on HCT116 and HL-60 cells.