PF-08634404

This study is being done to find out if a new medicine called PF-08634404, when given with chemotherapy, works better than the present standard treatment (pembrolizumab with chemotherapy) for adults with a type of lung cancer called non-small cell lung cancer (NSCLC) that is either locally advanced (spread to nearby tissues) or has spread to other parts of the body. To join the study, participants must meet the following conditions: * Be 18 years or older. * Have locally advanced (Stage IIIB/IIIC) or metastatic (Stage IV) squamous or non-squamous NSCLC. * Is not a candidate for complete surgical resection or curative chemoradiotherapy. * Do not have known actionable genomic alterations * Be treatment naïve for advanced or metastatic disease Participants in this study will be assigned to two different parts of the study depending on their type of tumor: participants with squamous NSCLC will be assigned to Part 1, while participants with non-squamous NSCLC will be assigned to Part 2. Each participant will be randomly assigned (like a flip of the coin) to one of two treatment groups in a blinded fashion: * Part 1 - Arm A or Part 2 - Arm C (Experimental Group): Will receive a new study medicine called PF-08634404 along with a kind of chemotherapy specific to the type of tumor. * Part 1 - Arm B or Part 2 - Arm D (Control Group): Will receive an approved medicine called pembrolizumab along with a kind of chemotherapy specific to the type of tumor. Participants will receive their assigned treatment through intravenous (IV) infusions, which means the medicine is given directly into a vein. The treatment will be given in cycles, participants will receive PF-08634404 or Pembrolizumab in combination with chemotherapy followed by maintenance with either PF-08634404 or Pembrolizumab monotherapy (Part 1) or PF-08634404 or Pembrolizumab in combination with a chemotherapeutic drug (Part 2). Participants will continue receiving treatment if it is helping and not experiencing serious side effects. The study will include regular visits for: * Treatment and health checks: while participant continues receiving treatment. * Tests to monitor how cancer responds: every 6 weeks during the first 48 weeks, then every 12 weeks thereafter.

The purpose of this study is to learn more about a new medicine called PF-08634404, and how well it works in people with cancer of the colon or rectum (CRC)). The goal is to understand if the new study medicine, combined with chemotherapy that is approved for colorectal cancer, can help people whose cancer has spread or returned after treatments taken before. To join the study, participants must meet the following conditions: * Be 18 years or older. * Have colorectal cancer that has spread to other parts of your body. * Be in good enough health to receive study treatment. * Should not be pregnant before starting treatment. Participants will be randomized (like flipping a coin) to one of 2 different treatment arms. The first arm (Arm A) will include the new medicine PF-08634404 in combination with chemotherapy that is approved for colorectal cancer, and the second arm (Arm B) will include an approved medicine for colorectal cancer, called Bevacizumab, in combination with chemotherapy that is approved for this type of cancer. Participants and their doctors will not know which arm they are being assigned to. Participants will receive all the study medications through intravenous (IV) infusions, which means the medicine is given directly into a vein. The treatment will be given in cycles, and participants may continue receiving it if it is helping and they are not experiencing serious side effects. The medicine will be given at a clinical site, where trained medical staff will check participants during and after each treatment. * The study is expected to last approximately 33 months for each participant. * Participants will have regular visits to the study site for treatment, health checks, and tests. * After stopping treatment, participants will return for a final visit about 30 to37 days later to check their health and review any side effects. * Follow-up will continue every 12 weeks by phone or in person or by reviewing health records to check on health status and any new treatments.

This study is being done to learn more about a new medicine called PF-08634404 and how well it works when given with chemotherapy to people with gastroesophageal cancer that is locally advanced (spread to nearby tissues) or has spread to other parts of the body. To join the study, participants must meet the following conditions: Be 18 years or older. Have locally advanced or metastatic gastric, gastroesophageal junction or esophageal adenocarcinoma Be treatment naïve for advanced or metastatic disease Be in good physical condition and have healthy organs based on medical tests. The study has two parts: * In the first part, researchers will check how safe the study medicine in combination with chemotherapy is and how well people respond to it. * In the second part, they will compare study medicine plus chemotherapy to another approved treatment (nivolumab plus chemotherapy) to see which works better. The treatment will be given in repeated time periods called cycles.

This study is being done to learn more about a new medicine called PF-08634404. It is for adults with a type of bladder cancer called locally advanced or metastatic urothelial cancer (LA/mUC), meaning the cancer has spread to nearby tissues or other parts of the body. The purpose of the study is to see if PF-08634404 is safe, how well it works, how it moves through the body, and how it affects the cancer. The study will also look at how the medicine may change certain markers in the body that are linked to cancer. To join the study, participants must: * Be adults (18 years or older) and * Have locally advanced or metastatic urothelial cancer, The study has two groups: * Cohort A: People who have already received treatment for their cancer will get the study medicine ( PF-08634404) alone. * Cohort B: People who have not had treatment before will get the study medicine along with another cancer medicine called enfortumab vedotin. Everyone in the study will get the study medicine through a vein (IV infusion) with or without enfortumab vedotin. Treatment will continue as long as it helps and side effects are manageable. Before starting, participants will go through a screening period to check if they are eligible. During the study, they will have regular visits for treatment, health checks, and tests to see how the cancer is responding. Scans will be done regularly to monitor the cancer. If the cancer gets worse but the treatment is still helping and side effects are manageable, participants may be allowed to continue treatment with their doctor's and the sponsor's agreement.

This study is being done to learn more about a new medicine called PF-08634404 and how well it works when given with chemotherapy to adults with extensive-stage small cell lung cancer (ES-SCLC), a fast-growing type of lung cancer that has spread widely in the body. To join the study, participants must meet the following conditions: * Be 18 years or older. * Have extensive-stage small cell lung cancer confirmed by lab tests. * Have not received chemotherapy or radiation for this type of lung cancer. * Be in good physical condition and have healthy organs based on medical tests. The study has two parts: * In the first part, researchers will check how safe the study medicine is and how well people tolerate it when given with chemotherapy. * In the second part, they will compare study medicine plus chemotherapy to another approved treatment (atezolizumab plus chemotherapy) to see which works better. Participants will receive the treatment through IV infusions (medicine given directly into a vein). The treatment will be given in repeated time periods called cycles. Some participants will continue receiving the study medicine alone after the initial treatment.

This study is being done to learn more about a new medicine called PF-08634404 and how it works when used with other cancer medicines in people who have advanced solid tumors. An advanced solid tumor is a type of cancer that has spread beyond its original location and cannot be removed by surgery or cured with standard treatments. To join in the study, participants must: * Be 18 years or older * Participants with advanced non-small cell lung cancer (NSCLC), a type of lung cancer that has spread The study will look at: * Whether PF-08634404 is safe to use with other cancer medicines. * What side effects may happen. A side effect is anything the medicine does to your body that is not part of treating your disease. * Whether the combination of PF-08634404 and other cancer medicines can help treat solid tumors. The study has different parts, each testing PF-08634404 with a different cancer medicine: * Part A will test PF-08634404 with a medicine called sigvotatug vedotin. * Part B of the study will look at how well the new medicine PF-08634404 works when used together with another medicine. Participants will receive the study medicines through an intravenous (IV) infusion (injected into the vein) at the study clinic. All treatments will take place at clinical trial sites, where trained medical staff will monitor participants during and after each visit.

The purpose of this study is to learn about the effects of study medicine (PF-08634404) when given alone or with another antibody (ipilimumab) for the treatment of a type of liver cancer called hepatocellular carcinoma (HCC) that is either locally advanced (spread to nearby tissues) or has spread to other parts of the body. To join the study, participants must meet the following conditions: * Be 18 years or older. * Have locally advanced or metastatic HCC. * Is not a candidate for complete surgical or loco-regional therapies. * Have not received any whole-body treatment for HCC. Participants will receive PF-08634404 either alone or in combination with ipilimumab. The medicine will be given through intravenous (IV) infusions, which means it will be administered directly into a vein. All treatments will take place at clinical trial sites, where trained medical staff will monitor participants during and after each visit.

This study is testing a new medicine called PF-08634404 and how it works in adults with advanced Renal Cell Carcinoma (RCC)- a type of kidney cancer that is either locally advanced (spread to nearby tissues) or metastatic (spread to other parts of the body). The study will look at the safety of the study medicine, when given alone or with other anticancer medicines, and how this type of cancer responds to them. To join the study, participants must be adults; with locally advanced or metastatic RCC; who have not received treatment for their advanced kidney cancer. Participants will receive study medicine either alone or with other anticancer medicines. The medicine will be given through intravenous (IV) infusions, which means it will be injected directly into a vein. All treatments will take place at clinical study sites, where trained medical staff will take care of participants during and after each visit.