1. To evaluate the safety and tolerability of LXI-15029 in Chinese patients with advanced malignant solid tumors in monotherapy period, including confirmation of the maximum tolerated dose (MTD) of monotherapy. 2.To evaluate the safety and tolerability of LXI-15029 in Chinese postmenopausal patients with metastatic or locally advanced breast cancer with estrogen receptor (+) and human epidermal growth factor receptor 2 (-) in combined with Exemestane period , including confirmation of the maximum tolerated dose(MTD) of the combined therapy with Exemestane.

Inclusion Criteria:

• Monotherapy Period

  1. Patients with signed written informed consent form;
  2. Chinese man or woman, aged 18 to 65 years old;
  3. Patient with histologically or cytologically confirmed, advanced solid tumor after failure of standard of care or without standard of care;
  4. Patients must have at least one measurable lesion as defined by RECIST v1.1 (during dose escalation phase,no measurable lesion as defined by RECIST v1.1 but evaluable lesion could also been enrolled);
  5. Expected survival no less than 12 weeks;
  6. Eastern Cooperative Oncology Group (USA) Performance Status 0 to 1;
  7. Patient of childbearing potential (regardless of man or woman) who is willing to take contraceptive measures from signature of the informed consent form to 3 months after the last dose of investigational product. Negative serum pregnancy test within 7 days prior to the planned first dose of investigational product for female patient of childbearing potential;
  8. Have the ability to communicate with study staff, understand and comply with all the study requirements;

• Combined with Exemestane period

  1. Patients with signed written informed consent form;
  2. Chinese patients aged postmenopausal women to 65 years old;
  3. Postmenopausal patient;
  4. Histologically or cytologically confirmed metastatic or locally advanced breast cancer that is not suitable for surgery or radiotherapy;
  5. Estrogen receptor (+), defined as tumor cells with estrogen receptor (+) ≥1% in immunohistochemistry;
  6. HER2-negative (Human epithelial growth factor receptor 2-negative) tumor;
  7. Measurable lesions in accordance with the Response Evaluation Criteria in Solid Tumors (RECIST) 1.1;
  8. Expected survival no less than 12 weeks;
  9. Eastern Cooperative Oncology Group (USA) Performance Status 0 to 1;
  10. Have the ability to communicate with study staff, understand and comply with all the study requirements;

Exclusion Criteria:

• Monotherapy Period:

  1. Previous antitumor therapy or any surgical operation within 4 weeks prior to administration of the first dose of study drug;
  2. Treatment with myeloid hematopoietic growth factor within 2 weeks prior to use of investigational product;
  3. Patients receiving corticosteroids or immunosuppressive agents within 4 weeks prior to administration of the first dose of study drug;
  4. Use of potent-to-moderate cytochrome metabolism enzyme CYP3A4 inhibitor and inducer prior to treatment or during washout period;
  5. Known allergy to LXI-15029 or similar products (mammalian target of rapamycin (mTOR) inhibitor or dual mTOR inhibitor) or other components of LXI-15029;
  6. Previous or receiving of PI3K or mTOR inhibitors (e.g., BKM120, everolimus, AZD8055 or AZD2014, etc.);
  7. History, symptoms or signs of spinal compression, brain metastasis or meningeal metastasis, or manifestations of edema or progression in radiology;
  8. History of other tumors within 5 years, except cured carcinoma in situ of cervix or cutaneous basal cell carcinoma;
  9. The toxicity induced by treatment unable to be recovered or stabilized to grade 1 or below except alopecia (common terminology criteria on adverse event version 4.03 (CTCAE 4.03));
  10. Hemotology and coagulation abnormal defined in protocol;
  11. Hepatic function abnormal defined in protocol;
  12. Renal function abnormal defined in protocol;
  13. Cholesterol > 300 mg/dl or 7.75 mmol/L, and/or triglyceride > 2.5 × ULN;
  14. Previous history of type 1 or 2 diabetes, or abnormal fasting blood glucose >126 mg/dL(>7 mmol/L) at screening;
  15. Cardiovascular system diseases;
  16. Patients with active upper peptic ulcer, refractory nausea and vomiting, or other conditions that were known to affect absorption, distribution, metabolism or elimination of drugs;
  17. Patients with chronic obstructive emphysema, pulmonary fibrosis or pneumonia that could significantly affect pulmonary function at discretion of the investigator;
  18. Infectious Diseases defined in protocol;
  19. Judged by the investigator, any other serious or uncontrolled acute or chronic disease, or laboratory abnormality (including but not limited to cardiovascular, hepatic and renal, as well as neuromuscular system), and alcohol consumption, drug abuse that could possibly increase the risk for study or interfere with study conduction and result analysis;
  20. Pregnant or lactating women;
  21. Previous enrollment in this study or participation in this investigational therapy;
  22. Participation in other clinical study during the last 30 days prior to Visit 1
  23. At discretion of the Investigator, the patient is unsuitable for participation in this study for any reasons;
  24. Patient of poor compliance.

• Combined with Exemestane period

  1. Previous antitumor therapy or any surgical operation within 4 weeks prior to administration of the first dose of study drug;

  2. Treatment with myeloid hematopoietic growth factor within two weeks prior to use of investigational product;

  3. Patients receiving corticosteroids or immunosuppressive agents within 4 weeks prior to administration of the first dose of study drug;

  4. Use of potent-to-moderate cytochrome metabolism enzyme CYP3A4 inhibitor and inducer prior to treatment or during washout period

  5. Previous use of Exemestane tablet;

  6. Known allergy to LXI-15029 or similar products (mTOR inhibitor or dual mTOR inhibitor) or other component of LXI-15029;

  7. Previous or receiving of PI3K or mTOR inhibitors (e.g., BKM120, everolimus, AZD8055 or AZD2014, etc.;

  8. Visceral crisis of breast cancer, not suitable for endocrine therapy;

  9. Inflammatory breast cancer;

  10. History, symptoms or signs of spinal compression, brain metastasis or meningeal metastasis, or manifestations of edema or progression in radiology;

  11. History of other tumors within 5 years, except cured carcinoma in situ of cervix or cutaneous basal cell carcinoma;

      Exclusion criteria on concomitant disease and organ function:

  12. The toxicity induced by treatment unable to be recovered or stabilized to grade 1 or below except alopecia (CTCAE 4.03);

  13. Hemotology and coagulation abnormal defined in protocol;

  14. Hepatic function abnormal defined in protocol;

  15. Renal function abnormal defined in protocol;

  16. Cholesterol > 300 mg/dl or 7.75 mmol/L, and/or triglyceride > 2.5 × ULN;

  17. Previous history of type 1 or 2 diabetes, or abnormal fasting blood glucose >126 mg/dL(>7 mmol/L) at screening;

  18. Cardiovascular system abnormal defined in protocol;

  19. Patients with active upper peptic ulcer, refractory nausea and vomiting, or other conditions that were known to affect absorption, distribution, metabolism or elimination of drugs;

  20. Patients with chronic obstructive emphysema, pulmonary fibrosis or pneumonia that could significantly affect pulmonary function at discretion of the investigator;

  21. Infectious Diseases defined in protocol;

  22. Judged by the investigator, any other serious or uncontrolled acute or chronic disease, or laboratory abnormality, and alcohol consumption, drug abuse that could possibly increase the risk for study or interfere with study conduction and result analysis;

  23. Previous enrollment in this study or participation in this investigational therapy;

  24. Participation in other clinical study during the last 30 days prior to Visit 1

  25. At discretion of the Investigator, the patient is unsuitable for participation in this study for any reasons;

  26. Patient of poor compliance.