Safety and Pharmacokinetics (PK) of Escalating Doses of Tiragolumab as a Single Agent and in Combination With Atezolizumab and/or Other Anti-Cancer Therapies in Locally Advanced or Metastatic Tumors

Atezolizumab will be given as 1200 mg via IV infusion on Day 1 of each 21-day cycle or as 1680 mg via IV infusion on Day 1 of each 28-day cycle.

Several dose levels will be evaluated for tiragolumab administered as a single agent and in combination with atezolizumab and/or other anti-cancer therapies. Tiragolumab will be given via IV infusion on Day 1 of each cycle (21-day or 28-day depending on study cohort and phase) until disease progression or loss of clinical benefit. Those who discontinue treatment with single-agent tiragolumab may receive combination treatment with tiragolumab and atezolizumab and/or other anti-cancer therapies. Combination treatment may continue until disease progression or loss of clinical benefit.

Carboplatin, AUC of 6 milligram per milliliter per minute (mg/ml/min) for Cohorts A and B and AUC of 5 mg/ml/min for Cohort C, IV infusion will be administered on Day 1 of each 21-day cycle after combination treatment of atezolizumab and tiragolumab IV infusion.

Cisplatin 75 milligram per square meter (mg/m\^2) IV infusion will be administered on day 1 of each 21-day cycle after combination treatment of atezolizumab and tiragolumab.

Pemetrexed 500 mg/m\^2 IV infusion will be administered on Day 1 of each 21-day cycle after carboplatin or cisplatin IV infusion with combination treatment of atezolizumab and tiragolumab.

Paclitaxel 200 mg/m\^2 IV infusion will be administered on Day 1 of each 21-day cycle after combination treatment with atezolizumab and tiragolumab.

Etoposide 100 mg/m\^2 IV infusion will be administered on Days 1, 2, and 3 of each 21-day cycle with combination treatment of atezolizumab and tiragolumab.

Capecitabine 1250 mg/m\^2 oral dose will be administered twice daily (BID) on Days 1 through 14 of each 21-day cycle. On Day 1 of Cycle 1, the first dose of capecitabine will be administered prior to the atezolizumab and tiragolumab infusion.

Bevacizumab 15 mg/kg IV infusion will be administered on Day 1 of each 21-day cycle after combination treatment of atezolizumab and tiragolumab.

Pembrolizumab 200 mg IV infusion will be administered on Day 1 of each 21-day cycle after treatment with tiragolumab.